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The shear behaviour on the interface between soil and structure is a research hot point. Based on the RMT-150B rock mechanics test system, a series of high-stress direct tests were performed on the coarse sand under the condition of different moisture contents and concrete substrates with different rough and hardness. The results showed that the shear stress-displacement curve and volumetric strain-displacement curve of the interface under high stress could be fitted by a hyperbolic model; the ultimate shear strength and initial shear stiffness of the interface both increased with the normal stress while the shear stiffness decreased with the shear displacement. The crushing rate of the coarse sand particles on the interface increased with the normal stress. After the range analysis for the influencing factors of the interface’s shearing behaviour, it was shown that for the ultimate shear strength, their sequence of influencing degree was normal stress, the roughness of interface, moisture content, and hardness of concrete base; for the initial shear strength, the sequence was normal stress, moisture content, interface roughness, and basal hardness. As for dry sand, the possibility of relative particle crushing was higher than that of sand with a moisture content of 8%, and a peak of crushing occurred when the moisture content was 16%.
Junkun Tan; Jiaqi Guo; Shifan Qiao; Changrui Dong; Ziyong Cai; Gang Wang. Experimental Study on the Shearing Behaviour on the Interface between Coarse Sand and Concrete under High Stress. Geofluids 2021, 2021, 1 -12.
AMA StyleJunkun Tan, Jiaqi Guo, Shifan Qiao, Changrui Dong, Ziyong Cai, Gang Wang. Experimental Study on the Shearing Behaviour on the Interface between Coarse Sand and Concrete under High Stress. Geofluids. 2021; 2021 ():1-12.
Chicago/Turabian StyleJunkun Tan; Jiaqi Guo; Shifan Qiao; Changrui Dong; Ziyong Cai; Gang Wang. 2021. "Experimental Study on the Shearing Behaviour on the Interface between Coarse Sand and Concrete under High Stress." Geofluids 2021, no. : 1-12.
Suffusion, one of the modes of internal erosion, occurs when fine particles are detached under hydraulic force. More fine particles are washed out with the void growth, which subsequently causes the failure of earthworks. At present, constitutive models considering suffusion are mostly established through DEM simulations and constitutive models that can capture the main features of eroded soils are quite limited. This study aims to establish constitutive equations to model the mechanical behaviour of soils subjected to suffusion by using drained triaxial experimental data. The modified subloading Cam-clay model incorporated with the normal yield surface for the eroded soil is proposed, which can express the variation of the normal yield surface with the loss of fine particles. The determination method of the erosion-related model parameters is also proposed. The erosion-related model parameters are estimated through empirical equations with curve-fitted parameters. Finally, the capability of this modified model is demonstrated through the comparisons with experimental results.
Gang Wang; Akihiro Takahashi. A modified subloading Cam-clay model for granular soils subjected to suffusion. Geomechanics and Geoengineering 2021, 1 -15.
AMA StyleGang Wang, Akihiro Takahashi. A modified subloading Cam-clay model for granular soils subjected to suffusion. Geomechanics and Geoengineering. 2021; ():1-15.
Chicago/Turabian StyleGang Wang; Akihiro Takahashi. 2021. "A modified subloading Cam-clay model for granular soils subjected to suffusion." Geomechanics and Geoengineering , no. : 1-15.
A reliable prediction of the surface deformation of slopes is vital to better assess the fatalities and economic losses caused by landslides. Many prediction methods have been proposed to estimate the surface deformation of landslides with nonlinear characteristics. However, these methods have low accuracy and poor applicability. In this paper, a new hybrid method for surface deformation prediction was proposed, which was deduced from the Wavelet Analysis, Genetic Algorithm (GA), and Elman Algorithm. In this method, the slope surface deformation was decomposed into a trend component and a periodic component using the time series model, which were trained and predicted utilizing the GA-Elman model. The predicted slope surface deformation was the combination of the trend component and the periodic component. Then, the predicted results of slope surface deformation through GA-Elman were compared with the predicted results through Support Vector Machines (SVM), Extreme Learning Machine (ELM), Back Propagation (BP), and Genetic Algorithm-Back Propagation (GA-BP) models. The comparison was made with reference to the data retrieved from the on-site slopes and the laboratory tests. The results revealed that the proposed method highlighted reliability and could be used with higher accuracy to forecast the slope surface deformation in the process of landslides.
Gang Wang; Zheng Fang; Jiren Xie; Na Du. Development of a Hybrid Method to Predict the Slope Surface Deformation Utilizing the Time Series and GA-Elman Models. Advances in Civil Engineering 2021, 2021, 1 -13.
AMA StyleGang Wang, Zheng Fang, Jiren Xie, Na Du. Development of a Hybrid Method to Predict the Slope Surface Deformation Utilizing the Time Series and GA-Elman Models. Advances in Civil Engineering. 2021; 2021 ():1-13.
Chicago/Turabian StyleGang Wang; Zheng Fang; Jiren Xie; Na Du. 2021. "Development of a Hybrid Method to Predict the Slope Surface Deformation Utilizing the Time Series and GA-Elman Models." Advances in Civil Engineering 2021, no. : 1-13.
During the construction stage of the small radius TBM (tunnel boring machine) interval, the improper control of the boring parameters and the boring posture can cause the horizontal axis deviation of the shield tunnel. In order to address this issue, the TBM segments lining structure of the small radius interval is simplified as the continuous circular curved beam based on the longitudinal equivalent continuous model and Winkler elastic foundation beam theory. The theoretical model is solved through the transfer matrix method, and its applicability is verified by comparing it with the field monitoring data. It is found that the horizontal axis deviation of the completed tunnel increases with the total jack thrust, and the lateral displacement tends to be stable when the distance between the ring and the tail is far. The horizontal axis deviation has a negative relationship with the thrust difference or path difference when the jack thrust in the outside of the shield curve is larger than that of inside the shield curve. The horizontal axis deviation has a positive relationship with the thrust difference or path difference when the jack thrust in the outside of the shield curve is smaller than that of inside the shield curve.
Shifan Qiao; Ping Xu; Ritong Liu; Gang Wang. Study on the Horizontal Axis Deviation of a Small Radius TBM Tunnel Based on Winkler Foundation Model. Applied Sciences 2020, 10, 784 .
AMA StyleShifan Qiao, Ping Xu, Ritong Liu, Gang Wang. Study on the Horizontal Axis Deviation of a Small Radius TBM Tunnel Based on Winkler Foundation Model. Applied Sciences. 2020; 10 (3):784.
Chicago/Turabian StyleShifan Qiao; Ping Xu; Ritong Liu; Gang Wang. 2020. "Study on the Horizontal Axis Deviation of a Small Radius TBM Tunnel Based on Winkler Foundation Model." Applied Sciences 10, no. 3: 784.