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Xuewei Liu
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China

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Journal article
Published: 12 January 2021 in International Journal of Rock Mechanics and Mining Sciences
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The presence of water in sandstones has caused many engineering geology disasters. In order to investigate the weakening mechanism of the clay-bearing green sandstone caused by water at different ambient temperature, the main water treatments have been conducted in this research, including dry-wet cycles, water immersion and freeze-thaw cycles. It shows that the repeated dry-wet cycles have little effect on the mechanical strength of this sandstone due to the lack of expansive clay minerals like montmorillonite. However, the water immersion and cyclic freeze-thaw treatments have caused a remarkable reduction of the strength. The UCS (uniaxial compressive strength) of this green sandstone has decreased by 27.2% from the dry to saturated state and it continues to decline for another 31.1% after 60 times of freeze-thaw cycles. In addition, the internal friction angle has a little increment but the cohesion decreases quickly with increasing freeze-thaw cycles. The adverse influence of the freeze-thaw damage on the TCS (triaxial compressive strength) would be inhibited by the confining pressure, because the pores and microcracks were compacted under a high confining pressure. The novel findings of this study are that the reversible physical softening should be responsible for the water weakening of this clay-bearing green sandstone above 0 °C, and the freeze-thaw damage is irreversible due to the production of plastic frost heaving deformation below 0 °C. Therefore, it is suggested that the effect of water weakening on the mechanical properties of the green sandstone should be considered in the wet state regardless of the number of dry-wet cycles, especially in cold regions.

ACS Style

Shibing Huang; Yingbo He; Xuewei Liu; Zekun Xin. Experimental investigation of the influence of dry-wet, freeze-thaw and water immersion treatments on the mechanical strength of the clay-bearing green sandstone. International Journal of Rock Mechanics and Mining Sciences 2021, 138, 104613 .

AMA Style

Shibing Huang, Yingbo He, Xuewei Liu, Zekun Xin. Experimental investigation of the influence of dry-wet, freeze-thaw and water immersion treatments on the mechanical strength of the clay-bearing green sandstone. International Journal of Rock Mechanics and Mining Sciences. 2021; 138 ():104613.

Chicago/Turabian Style

Shibing Huang; Yingbo He; Xuewei Liu; Zekun Xin. 2021. "Experimental investigation of the influence of dry-wet, freeze-thaw and water immersion treatments on the mechanical strength of the clay-bearing green sandstone." International Journal of Rock Mechanics and Mining Sciences 138, no. : 104613.

Journal article
Published: 25 August 2020 in Materials
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Mudstone material in a deep roadway is under the coupled stress-seepage condition. To investigate the permeability change and damage development during rock excavation in roadways, a stress-seepage damage coupling model has been proposed. In this model, damage capacity expansion of mudstone material is considered as the initiation and propagation of micro-cracks and the fracture penetration. A damage variable is introduced into the proposed model based on the principle of minimum energy consumption. As a result, an elastoplastic damage constitutive equation is established. Then, the permeability evolution equation describing the micro-macro hydraulic behavior of mudstone is deduced via percolation theory, which can describe the characteristics of sudden permeability change after rock capacity expansion. Furthermore, a finite element model is established based on commercial finite element software-ABAQUS. The numerical model was firstly verified by comparison between experimental and simulation results. On the basis of it, numerical investigation of the temporal and spatial evolution law of pore pressure, damage and permeability coefficient during roadway excavation is undertaken. The numerical results indicate that with increase of construction time, pore pressure first increases and then decreases, while the damage zone and permeability coefficient increase gradually and finally nearly keep constant. The proposed coupling model and finite element method can describe damage and permeability evolution for mudstone material under coupled stress-seepage well.

ACS Style

Bin Liu; Jinlan Li; Quansheng Liu; Xuewei Liu. Analysis of Damage and Permeability Evolution for Mudstone Material under Coupled Stress-Seepage. Materials 2020, 13, 3755 .

AMA Style

Bin Liu, Jinlan Li, Quansheng Liu, Xuewei Liu. Analysis of Damage and Permeability Evolution for Mudstone Material under Coupled Stress-Seepage. Materials. 2020; 13 (17):3755.

Chicago/Turabian Style

Bin Liu; Jinlan Li; Quansheng Liu; Xuewei Liu. 2020. "Analysis of Damage and Permeability Evolution for Mudstone Material under Coupled Stress-Seepage." Materials 13, no. 17: 3755.

Journal article
Published: 05 April 2020 in Energies
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Coal burst is a type of dynamic geological hazard in coal mine. In this study, a modified bursting energy index, which is defined as the ratio of elastic strain energy at the peak strength to the released strain energy density at the post-peak stage, was proposed to evaluate the coal burst proneness. The calculation method for this index was also introduced. Two coal mines (PJ and TJH coal mines) located in Ordos coalfield were used to verify the validity of the proposed method. The tests results indicate that modified bursting energy index increases linearly with increasing uniaxial compressive strength. The parameter A, which is used to fit relation between total input and elastic strain energy density, has a significant effect on the modified bursting energy index. A large value of parameter A means more elastic strain energy before the peak strength while a small value indicates most of input energy was dissipated. Finally, the coal burst proneness of these two coal mines was evaluated with the modified index. The results of modified index are consistent with that of laboratory tests, and more reasonable than that from original bursting energy index because it removed the dissipated strain energy from the total input strain energy density.

ACS Style

Xuewei Liu; Quansheng Liu; Bin Liu; Yongshui Kang. A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China. Energies 2020, 13, 1729 .

AMA Style

Xuewei Liu, Quansheng Liu, Bin Liu, Yongshui Kang. A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China. Energies. 2020; 13 (7):1729.

Chicago/Turabian Style

Xuewei Liu; Quansheng Liu; Bin Liu; Yongshui Kang. 2020. "A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China." Energies 13, no. 7: 1729.

Journal article
Published: 18 October 2019 in Journal of Geophysics and Engineering
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This paper presents an experimental study in which molded gypsum pre-cracked specimens with two types of flaw (single and X-shaped cross flaws) were tested under biaxial compression. Results show that acoustic emission (AE) energy rate curves can be divided into three different periods during uniaxial compression, which correspond to crack closure, linear elastic and unstable failure stages of specimens. However, only two periods are observed during biaxial compression, which correspond to linear elastic deformation and unstable failure. Furthermore, two proposed AE parameters, namely the AE energy ratio and AE energy release ratio, and a classical AE parameter b-value were used to analyze the influence of biaxial compression loading on AE energy, respectively. With increasing confining pressure, the AE energy release ratio, as well as AE b-value decreases gradually while AE energy ratio increases. Moreover, maximum and average AE energy rate values decrease as confining pressure increases. Data presented herein is useful to study the AE characteristics of pre-cracked specimens under biaxial compression.

ACS Style

Xuewei Liu; Quansheng Liu; Bin Liu; Qi Liu. Acoustic emission characteristics of pre-cracked specimens under biaxial compression. Journal of Geophysics and Engineering 2019, 16, 1164 -1177.

AMA Style

Xuewei Liu, Quansheng Liu, Bin Liu, Qi Liu. Acoustic emission characteristics of pre-cracked specimens under biaxial compression. Journal of Geophysics and Engineering. 2019; 16 (6):1164-1177.

Chicago/Turabian Style

Xuewei Liu; Quansheng Liu; Bin Liu; Qi Liu. 2019. "Acoustic emission characteristics of pre-cracked specimens under biaxial compression." Journal of Geophysics and Engineering 16, no. 6: 1164-1177.

Journal article
Published: 19 September 2019 in Engineering Analysis with Boundary Elements
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In this study, a two-dimensional SPH-FEM/DEM coupled model is developed to investigate rock breaking behavior under water jet impact based on the LS-DYNA software, where the SPH method is adopted to model the water jet and the FEM/DEM method is adopted to simulate rock breaking response, respectively. To better approximate the micro-structure of rock, a Voronoi tessellation technique is adopted to generate the random polygonal grains. A zero-thickness cohesive element is inserted along the boundaries of the Voronoi grains to model the mechanical interaction between grains as well as the breaking process of rock. Numerical water jet impact tests on sandstone are firstly conducted to verify the proposed method as well as calibrate the corresponding micro-parameters. Then, using the verified method, the effects of micro-structure and micro-mechanical properties on the rock breaking performance under water jet impact are systematically investigated. The numerical results show that the rock breaking performance is greatly affected by grain size and irregularity, ductility, microscopic strength and the heterogeneity of micro-parameters, whereas the contact stiffness ratio has little effect on the rock breaking performance under water jet impact.

ACS Style

Zhijun Wu; Fangzheng Yu; Penglin Zhang; Xuewei Liu. Micro-mechanism study on rock breaking behavior under water jet impact using coupled SPH-FEM/DEM method with Voronoi grains. Engineering Analysis with Boundary Elements 2019, 108, 472 -483.

AMA Style

Zhijun Wu, Fangzheng Yu, Penglin Zhang, Xuewei Liu. Micro-mechanism study on rock breaking behavior under water jet impact using coupled SPH-FEM/DEM method with Voronoi grains. Engineering Analysis with Boundary Elements. 2019; 108 ():472-483.

Chicago/Turabian Style

Zhijun Wu; Fangzheng Yu; Penglin Zhang; Xuewei Liu. 2019. "Micro-mechanism study on rock breaking behavior under water jet impact using coupled SPH-FEM/DEM method with Voronoi grains." Engineering Analysis with Boundary Elements 108, no. : 472-483.

Journal article
Published: 07 September 2019 in Applied Sciences
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A novel in situ stress monitoring method, based on rheological stress recovery (RSR) theory, was proposed to monitor the stress of rock mass in deep underground engineering. The RSR theory indicates that the tiny hole in the rock can close gradually after it was drilled due to the rheology characteristic, during which process the stress that existed in the rock can be monitored in real-time. Then, a three-dimensional stress monitoring sensor, based on the vibrating wire technique, was developed for in field measurement. Furthermore, the in-field monitoring procedures for the proposed technique are introduced, including hole drilling, sensor installation, grouting, and data acquisition. Finally, two in situ tests were carried out on deep roadways at the Pingdingshan (PDS) No. 1 and No. 11 coal mines to verify the feasibility and reliability of the proposed technique. The relationship between the recovery stress and the time for the six sensor faces are discussed and the final stable values are calculated. The in situ stress components of rock masses under geodetic coordinates were calculated via the coordinate transformation equation and the results are consistent with the in situ stress data by different methods, which verified the effectiveness of the proposed method.

ACS Style

Bin Liu; Yuanguang Zhu; Quansheng Liu; Xuewei Liu. A Novel in Situ Stress Monitoring Technique for Fracture Rock Mass and Its Application in Deep Coal Mines. Applied Sciences 2019, 9, 3742 .

AMA Style

Bin Liu, Yuanguang Zhu, Quansheng Liu, Xuewei Liu. A Novel in Situ Stress Monitoring Technique for Fracture Rock Mass and Its Application in Deep Coal Mines. Applied Sciences. 2019; 9 (18):3742.

Chicago/Turabian Style

Bin Liu; Yuanguang Zhu; Quansheng Liu; Xuewei Liu. 2019. "A Novel in Situ Stress Monitoring Technique for Fracture Rock Mass and Its Application in Deep Coal Mines." Applied Sciences 9, no. 18: 3742.

Journal article
Published: 01 August 2019 in International Journal of Computational Methods
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To investigate crack initiation and propagation of rock mass under coupled thermo-mechanical (TM) condition, a two-dimensional coupled TM model based on the numerical manifold method (NMM) is proposed, considering the effect of thermal damage on the rock physical properties and stress on the heat conductivity. Then, the NMM, using empirical strength criteria as the crack propagation critical criterion and physical cover as the minimum failure element, was extended for cracking process simulation. Furthermore, a high-order cover function was used to improve the calculation accuracy of stress. Therefore, the proposed method consists of three parts and has a high accuracy for simulating the cracking process in the rock mass under the coupled TM condition. The ability of the proposed model for high accuracy stress, crack propagation, and thermally-induced cracking simulation was verified by three examples. Finally, the proposed method was applied to simulate the stability of a hypothetical nuclear waste repository. Based on the outcome of this study, the application of NMM can be extended to study rock failure induced by multi-field coupling effect in geo-materials.

ACS Style

Xuewei Liu; Quansheng Liu; Jun He; Fangzheng Yu. Numerical Simulation of Cracking Process in Rock Mass Under the Coupled Thermo-Mechanical Condition. International Journal of Computational Methods 2019, 17, 1 .

AMA Style

Xuewei Liu, Quansheng Liu, Jun He, Fangzheng Yu. Numerical Simulation of Cracking Process in Rock Mass Under the Coupled Thermo-Mechanical Condition. International Journal of Computational Methods. 2019; 17 (9):1.

Chicago/Turabian Style

Xuewei Liu; Quansheng Liu; Jun He; Fangzheng Yu. 2019. "Numerical Simulation of Cracking Process in Rock Mass Under the Coupled Thermo-Mechanical Condition." International Journal of Computational Methods 17, no. 9: 1.

Journal article
Published: 08 January 2019 in Engineering Analysis with Boundary Elements
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The geothermal production from enhance geothermal system (EGS) involves complex thermal–hydraulic (TH) coupling process, which may affect the production efficiency and performance of EGS reservoir. In the study, a numerical manifold method (NMM) for TH coupling in fractured EGS is proposed. The EGS reservoir is considered to be formed from intact rock matrix blocks and discrete fractures networks. TH coupling control equations are firstly established using discrete fracture networks model. Then, the weight residual method was used to establish the discretized governing equation for transient heat conduction. Furthermore, the element sub-matrixes for heat conduction were presented. NMM approach simulating the fluid flow, heat conduction in fracture and rock matrix and TH coupling process was established. Finally, a single fracture heat extraction example was used to validate the effectiveness of the proposed method for solving a simplified TH coupling problem. Furthermore, a 2D fracture networks case was conducted to predict the performance of an EGS reservoir. The results in here validate the capability and accuracy of the proposed method and extend the application of NMM.

ACS Style

Xuewei Liu; Quansheng Liu; Bin Liu; Yongshui Kang; Jun He. Numerical manifold method for thermal–hydraulic coupling in fractured enhance geothermal system. Engineering Analysis with Boundary Elements 2019, 101, 67 -75.

AMA Style

Xuewei Liu, Quansheng Liu, Bin Liu, Yongshui Kang, Jun He. Numerical manifold method for thermal–hydraulic coupling in fractured enhance geothermal system. Engineering Analysis with Boundary Elements. 2019; 101 ():67-75.

Chicago/Turabian Style

Xuewei Liu; Quansheng Liu; Bin Liu; Yongshui Kang; Jun He. 2019. "Numerical manifold method for thermal–hydraulic coupling in fractured enhance geothermal system." Engineering Analysis with Boundary Elements 101, no. : 67-75.