Wang J.-J.,National Inland Waterway Regulation Engineering Research Center |
Yan Z.-L.,National Research Center on Mountain Highway Engineering and Technology
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2011
In order to investigate the homogeneous bank caving of reservoirs during the first impounding, 9 bank slope models divided into 4 types are made in the laboratory. The model test results indicate that the larger the angle of the bank slope, or the smaller the particle size in the bank slope, the more possible the bank caving. The collapse of the convex bank is easier than that of the concave bank. The larger the angle of the underlying bedrock, the more possible the bank caving. The typical phreatic lines in the model slope obtained from the experiments are compared with those obtained from a published analytic solution. The comparison indicates that the published analytic solution may over-estimate the elevation of the phreatic lines. The over-estimation may result from the neglecting of the unsaturated state of the bank soil mass in the analytic solution.
Wang J.-J.,Chongqing Jiaotong University |
Wang J.-J.,National Research Center on Mountain Highway Engineering and Technology |
Chai H.-J.,National Research Center on Mountain Highway Engineering and Technology |
Lin X.,Chongqing Jiaotong University |
Chen Y.-Y.,Chongqing Jiaotong University
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2011
To calculate the earth pressure in saturated soil mass subjected to earthquake forces and groundwater seepage, two cases, in which the seepage states are steady but the shapes of the flow lines are different, are investigated. The two cases are Case 1, in which the flow line is vertical downward, and Case 2, in which the flow line is curve toward retaining wall. Based on the pseudo-static method and Coulomb's theory, the formula to calculate the seismic active earth pressures in Cases 1 and 2 is proposed. The comparison of the results with the published work indicates that the suggested formula is reasonable. The influence of the soil effective internal friction angle on the seismic active earth pressure is also discussed. The results indicate that the total seismic active earth pressure is decreasing nonlinearly with the increase of the soil effective internal friction angle. And the decrement of the total seismic active earth pressure in Case 2 is larger than that in Case 1.