Abstract To study the influence of the Three Gorges impoundment on the seismic stability of the Badong Huangtupo landslide, we establish a two-dimensional finite difference numerical model based on the fluid solid coupling theory. On the basis of calculating the difference characteristics of site ground motion, stress response and pore water pressure of the landslide without water(before impoundment) and with water (175 m experimental impoundment), we give the time history of landslide safety coefficient, and discuss the landslide stability and its genesis mechanism under the combined action of impoundment and reservoir earthquake. The results show that: 1) The peak ground vibration acceleration of the upper and lower hard layers of the landslide under water condition is about 1.33 and 3.31 times, which has a significant site amplification effect and the influence of energy dissipation and seismic reduction of the soft interlayer. 2) Under transient seismic loading, due to the joint action of uncoordinated deformation and non-rapid drainage between the upper and lower hard layers of the landslide, the excess pore water pressure of the soft layer is formed rapidly and shows a phase accumulation rise, accompanied by the characteristics of transient amplification.
ZHANG Jie,ZENG Jinming,HU Qizhi et al. Study on Seismic Stability of Badong Huangtupo Landslide Based on Fluid Solid Coupling Theory[J]. jgg, 2023, 43(10): 1051-1055.
ZHANG Jie,ZENG Jinming,HU Qizhi et al. Study on Seismic Stability of Badong Huangtupo Landslide Based on Fluid Solid Coupling Theory[J]. jgg, 2023, 43(10): 1051-1055.