Analytical solution for slope instability assessment considering impact of confined aquifer
来源期刊：中南大学学报(英文版)2015年第4期
论文作者：RAN Qi-hua QIAN Qun WANG Guang-qian FU Xu-dong SU Dan-yang
文章页码：1502 - 1509
Key words：confined/artesian groundwater; slope stability; factor of safety; analytical approach
Abstract: An analytical approach was presented for estimating the factor of safety (FS) for slope failure, with consideration of the impact of a confined aquifer. An upward-moving wetting front from the confined water was assumed and the pore water pressure distribution was then estimated and used to obtain the analytical expression of FS. Then, the validation of the theoretical analysis was applied based on an actual case in Hong Kong. It is shown that the presence of a confined aquifer leads to a lower FS value, and the impact rate of hydrostatic pressure on FS increases as the confined water pressure increases, approaching to a maximum value determined by the ratio of water density to saturated soil density. It is also presented that the contribution of hydrostatic pressure and hydrodynamic pressure to the slope stability vary with the confined aquifer pressure.
RAN Qi-hua(冉启华)1, QIAN Qun(钱群)1, WANG Guang-qian(王光谦)1, 2, FU Xu-dong(傅旭东)2, SU Dan-yang(苏丹阳)1
(1. Institute of Hydrology and Water Resources, Zhejiang University, Hangzhou 310058, China;
2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China)
Abstract:An analytical approach was presented for estimating the factor of safety (FS) for slope failure, with consideration of the impact of a confined aquifer. An upward-moving wetting front from the confined water was assumed and the pore water pressure distribution was then estimated and used to obtain the analytical expression of FS. Then, the validation of the theoretical analysis was applied based on an actual case in Hong Kong. It is shown that the presence of a confined aquifer leads to a lower FS value, and the impact rate of hydrostatic pressure on FS increases as the confined water pressure increases, approaching to a maximum value determined by the ratio of water density to saturated soil density. It is also presented that the contribution of hydrostatic pressure and hydrodynamic pressure to the slope stability vary with the confined aquifer pressure.
Key words:confined/artesian groundwater; slope stability; factor of safety; analytical approach
