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Dr. Xianwen Huang
Anhui University of Science and Technology

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Research Keywords & Expertise

0 Geotechnical Engineering
0 Numerical Analysis
0 Slope Stability Analysis
0 Ground source heat pump
0 Thermal engineering

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Journal article
Published: 14 July 2021 in International Journal of Thermal Sciences
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The coaxial borehole heat exchangers (CBHEs) are efficient geothermal energy utilization method, which has recently attracted increasing attention. However, this method still has no suitable or efficient analysis method, which limits the wide application of CBHEs. Moreover, the non-uniformity of the ground has less been considered in related analyses, which will lead to estimation errors in CBHEs heat exchange efficiency. Hence, an analytical solution for coaxial borehole exchangers considering non-uniformity of the ground with high calculation efficiency is introduced in this paper. By comparing the CBHEs analytical model with typical experimental results, the reliability of this model is verified. Next, using reliability theory, we further investigate the heat exchange efficiency of CBHEs considering the non-uniformity of the ground, the temperature gradient, the fluid inlet direction, and the working temperature difference between the inlet and initial ground. The results show that the changes (±10%) of basic thermal conductivity will decrease the heat exchange efficiency by 4.5% and increase by 4.1%, respectively. With an increase in the ground's non-uniformity (from 0.2 to 0.6 W/m·K), the heat exchange efficiency of the CBHEs will decrease (from 0.4% to 1.4%). Compared to the results without considering the temperature gradient, the heat exchange efficiency of the CBHEs increased by 0.3%, 0.9%, and 1.3% (corresponding to 1, 2, and 3 °C temperature gradients at a 200 m depth). The CBHEs with the annular region as the inlet presented better heat exchange efficiency (by about 0.3%) than CBHEs with the round region as the inlet. the increase in the working temperature difference between the inlet and initial ground was found to greatly improve the heat exchange efficiency of the CBHEs. Moreover, according to the experimental and design cases, the necessity of considering soil non-uniformity has been proved. This study will provide a useful analytical simulation tool and an important guide to optimize CBHEs design considering the ground non-uniformity in the horizontal and vertical direction.

ACS Style

Xianwen Huang; Zhishu Yao; Haibing Cai; Xinwei Li; Hanqing Chen. Performance evaluation of coaxial borehole heat exchangers considering ground non-uniformity based on analytical solutions. International Journal of Thermal Sciences 2021, 170, 107162 .

AMA Style

Xianwen Huang, Zhishu Yao, Haibing Cai, Xinwei Li, Hanqing Chen. Performance evaluation of coaxial borehole heat exchangers considering ground non-uniformity based on analytical solutions. International Journal of Thermal Sciences. 2021; 170 ():107162.

Chicago/Turabian Style

Xianwen Huang; Zhishu Yao; Haibing Cai; Xinwei Li; Hanqing Chen. 2021. "Performance evaluation of coaxial borehole heat exchangers considering ground non-uniformity based on analytical solutions." International Journal of Thermal Sciences 170, no. : 107162.

Journal article
Published: 12 July 2021 in Sustainability
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The waste slurry produced by the dredging of urban rivers needs to be dewatered before being reused sustainably. As a large amount of plant debris accumulates in sediment, humus-like substances become one of main components in waste slurry. In light of the lack of research on the effect of fulvic acid (FA) in waste slurry on flocculation and separation, this paper carried out experimental research, including the effect of FA content on flocculation and filtration, as well as flocculation and filtration experiments of eight different sources of waste slurry. The results show that if only the FA content in the slurry is changed, the effect of FA on flocculation and separation is significant when the FA content is 0~3%, but it is not obvious when the FA content exceeds 3%. The flocculation and filtration results of eight different sources of river-dredged waste slurry are obviously different; the D10 increment can differ by nearly 10 times, and the specific resistance to filtration (SRF) differs by 2 orders of magnitude. However, FA is not a sensitive factor affecting the flocculation results. FA mainly affects the results by affecting the zeta potential of the slurry. Therefore, in the dewatering design of waste slurry, only the zeta potential needs to be considered.

ACS Style

Yi Yang; Silin Wu; Xianwen Huang. Experimental Study on the Effect of Fulvic Acid in Waste Slurry on Flocculation and Zeta Potential. Sustainability 2021, 13, 7784 .

AMA Style

Yi Yang, Silin Wu, Xianwen Huang. Experimental Study on the Effect of Fulvic Acid in Waste Slurry on Flocculation and Zeta Potential. Sustainability. 2021; 13 (14):7784.

Chicago/Turabian Style

Yi Yang; Silin Wu; Xianwen Huang. 2021. "Experimental Study on the Effect of Fulvic Acid in Waste Slurry on Flocculation and Zeta Potential." Sustainability 13, no. 14: 7784.

Research article
Published: 30 April 2021 in Advances in Civil Engineering
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In order to study the anchoring instability mechanism of surrounding rock in deep roadway, the failure mechanism of the bolt-anchoring agent interface was studied by simulating different strength rock mass and ground temperature environment, using C20, C40, and C60 strength concrete and steel pipe to simulate different surrounding rock strength environments. Indoor pull-out tests were carried out to study the pull-out load displacement relationship, ultimate pull-out force, residual anchoring force, the distribution law of axial stress and tangential stress along the bar, and the energy consumption value of drawing failure at 20, 50, and 70°C. The test results show that, with the decrease of surrounding rock strength or the increase of ambient temperature, the pull-out force, residual anchoring force, and energy consumption value of anchorage interface gradually decrease; under different axial forces, the axial force distribution of the rod body decreases exponentially from the anchoring end to the opposite end; and the shear stress transfers to the deep part of the anchor body with the increase of the load. According to the failure phenomenon of the specimen, the failure modes of the bolt bolt-anchorage agent interface can be divided into shear slip mode and shear expansion slip mode. The shear expansion slip formula of anchorage interface is derived. Using high-strength and temperature-resistant resin anchoring agent for comparative test, the rationality of the mechanism analysis is proved, which provides more clear guidance for the construction of anchor support.

ACS Style

Xiaohu Liu; Zhishu Yao; Weipei Xue; Xuesong Wang; Xianwen Huang. Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures. Advances in Civil Engineering 2021, 2021, 1 -17.

AMA Style

Xiaohu Liu, Zhishu Yao, Weipei Xue, Xuesong Wang, Xianwen Huang. Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures. Advances in Civil Engineering. 2021; 2021 ():1-17.

Chicago/Turabian Style

Xiaohu Liu; Zhishu Yao; Weipei Xue; Xuesong Wang; Xianwen Huang. 2021. "Experimental Study of the Failure Mechanism of the Anchorage Interface under Different Surrounding Rock Strengths and Ambient Temperatures." Advances in Civil Engineering 2021, no. : 1-17.

Journal article
Published: 16 March 2021 in Sustainability
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For reducing the initial GSHP investment, the heat transfer efficiency of the borehole heat exchange (BHE) system can be enhanced to reduce the number or depth of drilling. This paper proposes a novel and simple BHE design by changing the cross-sectional shape of the U-tube to increase the heat transfer efficiency of BHEs. Specifically, in this study, we (1) verified the reliability of the three-dimensional numerical model based on the thermal response test (TRT) and (2) compared the inlet and outlet temperatures of the different U-tubes at 48 h under the premise of constant leg distance and fluid area. Referent to the circular tube, the increases in the heat exchange efficiencies of the curved oval tube, flat oval tube, semicircle tube, and sector tube were 13.0%, 19.1%, 9.4%, and 14.8%, respectively. (3) The heat flux heterogeneity of the tubes on the inlet and outlet sides of the BHE, in decreasing order, is flat oval, semicircle, curved oval, sector, and circle shapes. (4) The temperature heterogeneity of the borehole wall in the BHE in decreasing order is circle, sector, curved oval, flat oval, and semicircle shapes. (5) Under the premise of maximum leg distance, referent to the heat resistance of the tube with a circle shape at 48 h, the heat exchange efficiency of the curved oval, flat oval, semicircle, and sector tubes increased 12.6%, 17.7%, 10.3%, and 7.8%, respectively. (6) We found that the adjustments of the leg distance and the tube shape affect the heat resistance by about 25% and 12%, respectively. (7) The flat-oval-shaped tube at the maximum leg distance was found to be the best tube design for BHEs.

ACS Style

Aizhao Zhou; Xianwen Huang; Wei Wang; Pengming Jiang; Xinwei Li. Thermo-Hydraulic Performance of U-Tube Borehole Heat Exchanger with Different Cross-Sections. Sustainability 2021, 13, 3255 .

AMA Style

Aizhao Zhou, Xianwen Huang, Wei Wang, Pengming Jiang, Xinwei Li. Thermo-Hydraulic Performance of U-Tube Borehole Heat Exchanger with Different Cross-Sections. Sustainability. 2021; 13 (6):3255.

Chicago/Turabian Style

Aizhao Zhou; Xianwen Huang; Wei Wang; Pengming Jiang; Xinwei Li. 2021. "Thermo-Hydraulic Performance of U-Tube Borehole Heat Exchanger with Different Cross-Sections." Sustainability 13, no. 6: 3255.

Research article
Published: 24 December 2020 in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects
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In order to meet increasing demand for building energy, the coaxial borehole heat exchanger (CBHE) is proposed as an efficient and environmentally friendly geothermal energy-utilization device, but there is no suitable analytical model for its heat exchange analysis. Hence, an analytical model of CBHE with segmented method that can consider the non-uniformity of the thermal conductivity of outer soil is proposed. First, the heat-transfer models inside and outside the borehole are introduced, respectively; then, on the basis of time superposition and the segment cylinder-source method, using borehole-wall temperature as an intermediate quantity, the two models were coupled as a three-dimensional model; then, the corresponding calculation principle and calculation process of the model are introduced. After that, through a comparison between experiment- and numerical-analysis results, the rationality of the analytical model was verified on the basis of thermal-response-test (TRT) results and temperature distribution along with the depth. In addition, it can conclude that the analytical model has higher calculating efficiency than the numerical analysis on the premise of maintaining accuracy. Lastly, the effect of the thermal conductivity of the inner and outer pipes, backfill material, and outer soil on the heat-exchange efficiency of CBHE was studied, and the results showed that, for the inner pipe, as thermal conductivity increased, the heat-transfer efficiency of CBHE gradually decreased; for the outer tube, backfill material, and outer soil, as thermal conductivity increased, the heat-transfer efficiency of CBHE increased. The influence of material thermal conductivity on the heat-transfer effect of CBHE was in the descending order of outer pipe, backfill material, inner pipe, and outer soil. Besides, we concluded that a CBHE with an annular region as inlet had better heat-exchange efficiency than that with a round region as inlet. The most optimized design of CBHE (considering heat-exchange and economic efficiency) is that with an inner pipe with low thermal conductivity, thermal conductivity of the outer pipe larger than that of the backfill material, thermal conductivity of the backfill material larger than that of the outer soil, and the outer soil is in the area being rich in groundwater.

ACS Style

Xianwen Huang; Zhishu Yao; Haibing Cai; Weipei Xue; Xuesong Wang. An analytical heat-transfer model for coaxial borehole heat exchanger with segmented method. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 2020, 1 -27.

AMA Style

Xianwen Huang, Zhishu Yao, Haibing Cai, Weipei Xue, Xuesong Wang. An analytical heat-transfer model for coaxial borehole heat exchanger with segmented method. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. 2020; ():1-27.

Chicago/Turabian Style

Xianwen Huang; Zhishu Yao; Haibing Cai; Weipei Xue; Xuesong Wang. 2020. "An analytical heat-transfer model for coaxial borehole heat exchanger with segmented method." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects , no. : 1-27.

Research article
Published: 19 December 2020 in Advances in Civil Engineering
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Embedding soft soil particles with high moisture content into miscellaneous fill with large pores under overlying loads is easy. It produces mutually embedded settlement, which is an important component of total foundation settlement during calculation. In this study, influences of interface friction on mutually embedded settlement, particle displacement, pore and contact characteristics, and mutually embedded development laws were analysed by using the particle flow method. Research results demonstrate that mutually embedded settlement decreases first and then stabilizes with the increase in contact friction factor and continuously attenuates with normal stiffness. Under the loads, particles at the contact surface move downward and squeeze surrounding particles laterally, thus causing particles to slide at the miscellaneous fill channel upward. Consequently, porosity of particles in miscellaneous fill channel increases. The force chain at the contact surface inclines around, while that at the miscellaneous fill channel presents approximately horizontal distribution. Compared with 35 and 45 mm particles, the mutually embedded settlement of 15 and 25 mm particles is slightly increased with loads. Particle size can relieve the influences of loads on mutual embedding. When particle size is larger than 25 mm, loads can significantly influence mutual embedding. Research conclusions can provide a reasonable theoretical foundation for calculating or predicting settlement of miscellaneous fill-soft soil composite foundation.

ACS Style

Fuhai Zhang; Zhengrong Liu; Yu Chen; Liang Chen; Xianwen Huang; Yanhui Bai; Chong Shi; Tianbao Zhou. Numerical Simulation of Mutually Embedded Settlement in Miscellaneous Fill. Advances in Civil Engineering 2020, 2020, 1 -10.

AMA Style

Fuhai Zhang, Zhengrong Liu, Yu Chen, Liang Chen, Xianwen Huang, Yanhui Bai, Chong Shi, Tianbao Zhou. Numerical Simulation of Mutually Embedded Settlement in Miscellaneous Fill. Advances in Civil Engineering. 2020; 2020 ():1-10.

Chicago/Turabian Style

Fuhai Zhang; Zhengrong Liu; Yu Chen; Liang Chen; Xianwen Huang; Yanhui Bai; Chong Shi; Tianbao Zhou. 2020. "Numerical Simulation of Mutually Embedded Settlement in Miscellaneous Fill." Advances in Civil Engineering 2020, no. : 1-10.

Research article
Published: 16 December 2020 in Advances in Civil Engineering
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Soil-rock slopes are widely distributed in central or western China. With the development of transportation, many subgrades are being built on mountainsides and therefore, slope stability has to be estimated under high loadings. To obtain better estimation results, a new rock contour establishing algorithm was developed, capable of considering interlock effect between rocks. Then, computed tomography (CT) and unconfined triaxial tests with ring top loadings were conducted. Based on rock distribution characteristics (obtained by CT photos) and the appearance of shear failure surfaces in slopes under ring top loadings, four rock skeleton status and five shear failure surface developing models were introduced. Based on the developed rock contour establishing algorithm, ten groups (twelve models per group) were established and calculated by finite element method (FEM). After this, normalized ultimate loading increasing multiple N, which was the ultimate loading ratio of rock-containing slope to uniform soil slope, was introduced to evaluate the influence of rock distributions on slope stability. The value of N was increased with the increase of rock content due to rock skeleton status. The values of N in slopes with angular rocks were about three times higher than those with round rocks which was due to complex geometric shape and distribution characteristics of angular rocks. Then, considering different slope angles (50°–60°), rock contents (0%–60%), and rock shapes (round and angular), the ultimate loading increasing multiple N of soil-rock slopes under high loadings was calculated and suggested for engineering designs. Finally, based on the failure surfaces of numerical modes, three typical failure modes were developed, which could be reference for designers to deal with slopes.

ACS Style

Huang Xian-Wen; Zhi-Shu Yao; Wang Bing-Hui; Zhou Ai-Zhao; Peng-Ming Jiang. Soil-Rock Slope Stability Analysis under Top Loading considering the Nonuniformity of Rocks. Advances in Civil Engineering 2020, 2020, 1 -15.

AMA Style

Huang Xian-Wen, Zhi-Shu Yao, Wang Bing-Hui, Zhou Ai-Zhao, Peng-Ming Jiang. Soil-Rock Slope Stability Analysis under Top Loading considering the Nonuniformity of Rocks. Advances in Civil Engineering. 2020; 2020 ():1-15.

Chicago/Turabian Style

Huang Xian-Wen; Zhi-Shu Yao; Wang Bing-Hui; Zhou Ai-Zhao; Peng-Ming Jiang. 2020. "Soil-Rock Slope Stability Analysis under Top Loading considering the Nonuniformity of Rocks." Advances in Civil Engineering 2020, no. : 1-15.

Research article
Published: 22 November 2020 in Advances in Materials Science and Engineering
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In order to study the static and dynamic mechanical characteristics of the coal gangue concrete used in the mine support structure, the compressive strength test, the drop weight impact test, and the Split Hopkinson Pressure Bar (SHPB) test were conducted. The compressive strength, initial and final impacting energy, dynamic strength, and failure characteristic of concrete were obtained of the concrete single-doped with coal gangue coarse aggregate, single-doped with coal gangue fine aggregate, and codoped with coal gangue coarse and fine aggregates. The results show that (1) it is feasible that employing coal gangue to replace natural coarse and fine aggregates in concrete can prepare C30 and C40 concrete; (2) the addition of coal gangue fine aggregate has a positive effect on the impact energy of the initial and final cracks of concrete, while the addition of coal gangue coarse aggregate has a negative effect on it; (3) compared with the static strength, the dynamic strength of concrete is improved no matter whether coal gangue is added to concrete; (4) the incorporation of coal gangue coarse aggregate will make the concrete shear surface smooth; (5) at the given impacting pressure, the concrete with coal gangue coarse aggregate has greater particle breakage and those with coal gangue fine aggregate has less. The research of this study can be a reference for the application of gangue concrete in mine support structures.

ACS Style

Zhishu Yao; Yu Fang; Weihao Kong; Xianwen Huang; Xuesong Wang. Experimental Study on Dynamic Mechanical Properties of Coal Gangue Concrete. Advances in Materials Science and Engineering 2020, 2020, 1 -16.

AMA Style

Zhishu Yao, Yu Fang, Weihao Kong, Xianwen Huang, Xuesong Wang. Experimental Study on Dynamic Mechanical Properties of Coal Gangue Concrete. Advances in Materials Science and Engineering. 2020; 2020 ():1-16.

Chicago/Turabian Style

Zhishu Yao; Yu Fang; Weihao Kong; Xianwen Huang; Xuesong Wang. 2020. "Experimental Study on Dynamic Mechanical Properties of Coal Gangue Concrete." Advances in Materials Science and Engineering 2020, no. : 1-16.

Research article
Published: 19 November 2020 in Advances in Civil Engineering
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In this study, to support slope stability estimating engineering, the stability of a slope with cracks lying on two-layered slopes was investigated by a self-developed adaptive element limit analysis (AFELA) code. Upper bound (UB) and lower bound (LB) results of soil additional gravity factor SF within 4% relative error were obtained to quantify the effects of several factors, including the Moore‒Cullen strength ratio, angle of the slope, thickness of the top layer, length of the crack, angle of the crack, and crack’s distance from the edge. Typical failure patterns were also discussed for deeper insight into the two-layered slope stability with cracks. In addition, the results of the AFELA code were compared with the actual situation of the slope and existing commercial calculation software to verify the reliability of this investigation.

ACS Style

Ai-Zhao Zhou; Gang Liu; Xian-Wen Huang; Peng-Ming Jiang; Yu Chen. Stability Analysis of a Two-Layered Slope with Cracks by Finite Element Limit Analysis. Advances in Civil Engineering 2020, 2020, 1 -15.

AMA Style

Ai-Zhao Zhou, Gang Liu, Xian-Wen Huang, Peng-Ming Jiang, Yu Chen. Stability Analysis of a Two-Layered Slope with Cracks by Finite Element Limit Analysis. Advances in Civil Engineering. 2020; 2020 ():1-15.

Chicago/Turabian Style

Ai-Zhao Zhou; Gang Liu; Xian-Wen Huang; Peng-Ming Jiang; Yu Chen. 2020. "Stability Analysis of a Two-Layered Slope with Cracks by Finite Element Limit Analysis." Advances in Civil Engineering 2020, no. : 1-15.

Journal article
Published: 12 October 2020 in Crystals
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To address the temperature cracking of concrete in frozen shaft linings in extra-thick alluvial layers in coal mines, a novel shaft lining structure of coal mines consisting of hybrid-fiber-reinforced concrete (HFRC) was developed. Using the Finite Element Method (FEM), a numerical simulation test of the HFRC shaft lining structure with four factors and three levels was carried out, and the mechanical characteristics of the shaft lining structure were obtained. The results show that under a uniform surface load, the maximum hoop stress position of the HFRC shaft lining presents a transition trend from the inside surface to the outside surface; the hoop strain of shaft lining concrete is always a compressive strain, and the inside surface is greater than the outside surface. The empirical formula for the ultimate capacity of this new type of shaft lining structure was obtained by fitting. Compared with the model test results, the maximum relative error of the calculated value is only 6.69%, which provides a certain reference value for designing this kind of shaft lining structure.

ACS Style

Xuesong Wang; Hua Cheng; Taoli Wu; Zhishu Yao; Xianwen Huang. Numerical Analysis of a Novel Shaft Lining Structure in Coal Mines Consisting of Hybrid-Fiber-Reinforced Concrete. Crystals 2020, 10, 928 .

AMA Style

Xuesong Wang, Hua Cheng, Taoli Wu, Zhishu Yao, Xianwen Huang. Numerical Analysis of a Novel Shaft Lining Structure in Coal Mines Consisting of Hybrid-Fiber-Reinforced Concrete. Crystals. 2020; 10 (10):928.

Chicago/Turabian Style

Xuesong Wang; Hua Cheng; Taoli Wu; Zhishu Yao; Xianwen Huang. 2020. "Numerical Analysis of a Novel Shaft Lining Structure in Coal Mines Consisting of Hybrid-Fiber-Reinforced Concrete." Crystals 10, no. 10: 928.

Journal article
Published: 08 April 2020 in Symmetry
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A soil–rock slope is a heterogeneous slope composed of soil and rocks that is widely distributed throughout the world. In order to accurately analyze the slope stability of soil–rock mixture, based on a Monte Carlo algorithm (fuzzy-based method), a symmetrical stability analyzing method for soil–rock slopes is proposed, considering the dispersion of strength of soil–rock mixtures. In analyzing it, the numerical model is symmetrical to the real soil–rock slope in geometry and material properties. In addition, the effect of rock content to slope stability was studied by this symmetrical method. The specific work of this paper is as follows: (1) The acquisition method of random number series for the Monte Carlo algorithm and the method of slope stability analysis, using the Monte Carlo method, are introduced. (2) According to in situ samples and remade samples, the strength characteristics of soil–rock mixtures were measured with different rock contents, which proved the scatter of strength of soil–rock mixtures. (3) Based on the measured strength parameters of soil–rock mixtures and the slope landslide, the reliability in analyzing results and superiority in calculating time of using the Monte Carlo method to analyze stability of soil–rock slopes are detailed. (4) The stability of soil–rock slopes with different rock content is discussed with the Monte Carlo method, and it is concluded that with the increase of rock content, the stability of a soil–rock slope decreases first and then increases, and the minimum safety factor is acquired at 20% rock content. (5) Based on a large number of calculation examples, the applied situations of the Monte Carlo method to analyze stability of soil–rock slopes are detailed according to sampling results and rock size.

ACS Style

Aizhao Zhou; Xianwen Huang; Na Li; Pengming Jiang; Wei Wang. A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials. Symmetry 2020, 12, 590 .

AMA Style

Aizhao Zhou, Xianwen Huang, Na Li, Pengming Jiang, Wei Wang. A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials. Symmetry. 2020; 12 (4):590.

Chicago/Turabian Style

Aizhao Zhou; Xianwen Huang; Na Li; Pengming Jiang; Wei Wang. 2020. "A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials." Symmetry 12, no. 4: 590.

Journal article
Published: 21 February 2020 in Sustainability
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In order to support the dynamic design of subgrade filling engineering, an experiment on the dynamic shear modulus (G) and damping ratio (D) of clay–gravel mixtures (CGMs) was carried out. Forty-two groups of resonant column tests were conducted to explore the effects of gravel content (0%, 10%, 20%, 30%, 40%, 50%, and 60%, which was the mass ratio of gravel to clay), gravel shape (round and angular gravels), and confining pressure (100, 200, and 300 kPa) on the dynamic shear modulus, and damping ratio of CGMs under the same compacting power. The test results showed that, with the increase of gravel content, the maximum dynamic shear modulus of CGMs increases, the referent shear strain increases linearly, and the minimum and maximum damping ratios decrease gradually. In CGMs with round gravels, the maximum dynamic shear modulus and the maximum damping ratio are greater, and the referent shear strain and the minimum damping ratio are smaller, compared to those with angular gravels. With the increase of confining pressure, the maximum dynamic shear modulus and the referent shear strain increase nonlinearly, while the minimum and maximum damping ratios decrease nonlinearly. The predicting equation for the dynamic shear modulus and the damping ratio of CGMs when considering confining pressure, gravel content, and shape was established. The results of this research may put forward a solid foundation for engineering design considering low-strain-level mechanical performance.

ACS Style

Xianwen Huang; Aizhao Zhou; Wei Wang; Pengming Jiang. Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level. Sustainability 2020, 12, 1616 .

AMA Style

Xianwen Huang, Aizhao Zhou, Wei Wang, Pengming Jiang. Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level. Sustainability. 2020; 12 (4):1616.

Chicago/Turabian Style

Xianwen Huang; Aizhao Zhou; Wei Wang; Pengming Jiang. 2020. "Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level." Sustainability 12, no. 4: 1616.

Research article
Published: 31 October 2019 in Advances in Civil Engineering
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It is difficult to directly measure the dynamic elastic modulus of soils when the strain is less than 10−4, though the dynamic shear modulus can be easily obtained by the free-vibration testing method. Some improvements were adapted to the traditional free-vibration column for measuring dynamic elastic modulus of soil precisely with lateral vibration in small strain (10−4∼10−6). Differing from the traditional lateral vibration theory, a new dynamic elastic modulus testing method based on bending vibration equation of cantilever beam was put forward based on the improved free-vibration column of GZZ-50. Firstly, some descriptions about calibration process of needed testing parameter (moment of inertia of drive board) were made, and then, Poisson’s ratio of standardized column was used to confirm the measured results. Four main improvements were applied, including the shape of drive board which made the bending vibration equation solved, laser displacement sensors for correcting specimen’s height parameter with uncontacted manner which can reduce the influence of specimen, a hoop with plug used to make the split mould be removed, and air duct used when installing drive board to increase the success rate of installing specimen. Finally, standard process of installing specimen was described, which can be used as reference of similar test.

ACS Style

Dandan Jin; Xianwen Huang; Binghui Wang; Aizhao Zhou; Shunqing Liu. Method Improvements of Testing Modulus of Soil Based on Free-Vibration Column. Advances in Civil Engineering 2019, 2019, 1 -9.

AMA Style

Dandan Jin, Xianwen Huang, Binghui Wang, Aizhao Zhou, Shunqing Liu. Method Improvements of Testing Modulus of Soil Based on Free-Vibration Column. Advances in Civil Engineering. 2019; 2019 ():1-9.

Chicago/Turabian Style

Dandan Jin; Xianwen Huang; Binghui Wang; Aizhao Zhou; Shunqing Liu. 2019. "Method Improvements of Testing Modulus of Soil Based on Free-Vibration Column." Advances in Civil Engineering 2019, no. : 1-9.

Research article
Published: 08 November 2018 in Mathematical Problems in Engineering
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Soil-rock slopes are widely distributed around the world, while the commonly adopted method by simplifying it as a uniform media tends to be excessively conservative. In this study, a slope stability analysis method considering the nonuniform characteristics of rocks was proposed. It was found that the distribution, relative position, and shape of rock have significant effect on slope stability. For the influence of distribution, large rocks at the foot of slope have the most significant effect on slope stability while the effect is insignificant when the rocks are on the slope surface. In terms of the relative position of rocks, four plastic expansion modes of bypass, diversion, inclusion, and penetration were put forward through the analysis on the expansion mode of the plastic zone. Moreover, rock shape also has influence on slope stability.

ACS Style

Shunqing Liu; Xianwen Huang; Aizhao Zhou; Jun Hu; Wei Wang. Soil-Rock Slope Stability Analysis by Considering the Nonuniformity of Rocks. Mathematical Problems in Engineering 2018, 2018, 1 -15.

AMA Style

Shunqing Liu, Xianwen Huang, Aizhao Zhou, Jun Hu, Wei Wang. Soil-Rock Slope Stability Analysis by Considering the Nonuniformity of Rocks. Mathematical Problems in Engineering. 2018; 2018 ():1-15.

Chicago/Turabian Style

Shunqing Liu; Xianwen Huang; Aizhao Zhou; Jun Hu; Wei Wang. 2018. "Soil-Rock Slope Stability Analysis by Considering the Nonuniformity of Rocks." Mathematical Problems in Engineering 2018, no. : 1-15.

Review
Published: 01 August 2016 in Int. Journal of Clinical Pharmacology and Therapeutics
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Treatment with desmopressin diacetate arginine vasopressin (DDAVP) and its withdrawal are associated with side effects. We present a rare case of severe biphasic adverse reactions induced by DDAVP and its withdrawal in a 63-year-old female patient. A lump in the left axillary region was biopsied, and she received DDAVP after surgery. The following day, she lost consciousness, with foaming at the mouth and seizures. Hypotonic encephalopathy was considered. DDAVP was ceased, and she received electrolytes. On day 1, she displayed low blood pressure and increased urine output. She received DDAVP and dopamine as well as electrolytes. The patient was ambulatory on day 7 and was discharged without brain abnormalities on MRI. In conclusion, severe hyponatremia induced by DDAVP and massive polyuria and hypovolemic shock induced by DDAVP withdrawal are life-threatening conditions. This case underlines the need to be vigilant when administering DDAVP and to monitor for any side effects.

ACS Style

Lijun Wang; Ruijun Chen; Fang Tian; Wei Wang; Li Wang; Baojun Yu; Xianwen Huang; Yuehui Zhang; Shengyuan Su; Guangnian Ma; Kaichen Wang. Life threatening biphasic adverse reactions to desmopressin: case report and review of the literature. Int. Journal of Clinical Pharmacology and Therapeutics 2016, 54, 640 -644.

AMA Style

Lijun Wang, Ruijun Chen, Fang Tian, Wei Wang, Li Wang, Baojun Yu, Xianwen Huang, Yuehui Zhang, Shengyuan Su, Guangnian Ma, Kaichen Wang. Life threatening biphasic adverse reactions to desmopressin: case report and review of the literature. Int. Journal of Clinical Pharmacology and Therapeutics. 2016; 54 (8):640-644.

Chicago/Turabian Style

Lijun Wang; Ruijun Chen; Fang Tian; Wei Wang; Li Wang; Baojun Yu; Xianwen Huang; Yuehui Zhang; Shengyuan Su; Guangnian Ma; Kaichen Wang. 2016. "Life threatening biphasic adverse reactions to desmopressin: case report and review of the literature." Int. Journal of Clinical Pharmacology and Therapeutics 54, no. 8: 640-644.