基于库水位变化的南湾滑坡三维数值模拟OA

Taking Nanwan landslide in Southwest Henan Province as an engineering example,com-bined with soil mechanics seepage theory and FLAC3D software,three-dimensional numerical simulation of Nanwan landslide in southwest Henan Province was carried out by using finite difference software FLAC3D software through the influence of reservoir water level sudden drop on pore water pressure and seepage field distribution,combined with two-dimensional unsaturated seepage theory and two-dimensional seepage analysis software in soil mechanics.The results show that the pore water pressure of the soil mass in Nan-wan landslide in southwest Henan Province tends to increase when the reservoir water level was at 105.89m,and the soil mass was relatively dense,which has no adverse effect on the stability of the landslide.When the reservoir water level drops abruptly,the pore water pressure of the landslide body drops rapid-ly,driving the flow of soil particles in the landslide body.Due to the change of seepage force,the safety factor of landslide soil mass was reduced,and then the local instability of landslide soil mass was caused.It provides a theoretical reference for the analysis and evaluation of landslide stability under the state of reser-voir water level rise and fall.