| The landslide of Bacai Village in Ruyang County is 55m long and 148m wide,with the main slide direction of 98°,and the volume of landslide is about 10.05 million m~3.After the flood in 2020,the local deformation of the landslide will begin,and once the landslide is destabilized and destroyed,it will cause unnecessary economic losses and seriously threaten the lives of residents.Therefore,it is very necessary to study the stability of this landslide and propose reasonable control countermeasures.This paper takes the landslide of Bacai Village as the research object and analyzes its deformation mechanism and influencing factors.Based on this,With the help of Geo-Studio’s Seep/W module,we simulate the seepage of landslides under rainfall conditions,focusing on revealing the effect of rainfall on the pore water pressure within the landslide body.And then,with the help of Slope/W module,the stability of landslides under natural,seismic,and saturated conditions is simulated and evaluated.and simulate the dynamic change process of landslide stability coefficient under rainfall conditions to analyze the influence of rainfall on landslide stability.Finally,reasonable landslide control measures are proposed and the reinforcement effect is simulated.The results show that:(1)The landslide is a medium-sized traction landslide and is currently in the creep-slip stage,with the main triggering factors being slope cutting and rainfall.(2)In the natural state,the pore water pressure of landslide soil is gradually increasing from top to bottom and is distributed in layers;rainfall will increase the pore water pressure of soil,and the pore pressure growth rate is decreasing from top to bottom in the depth range affected by rainfall;with the continuation of rainfall or the increase of rainfall intensity,the depth range affected by rainfall is increasing,and at the same time,the area at the foot of the landslide is the area affected by rainfall for the longest time.(3)In the natural state,the stability coefficients of the 1-1’and 4-4’profiles in the landslide area are 1.040 and 1.263,which are in the under-stable state and stable state,and the stability coefficient of the 7-7’profile in the side slope area is 1.124,which is in the basic stable state.In the seismic state,the stability coefficients of the three profiles are 1.003,1.227 and 1.094,which are in the under-stable state,stable state and basic stable state.In the saturated state,the stability coefficients were 0.951,1.086,and 0.975,which were in the unstable,basic stable,and unstable states.Rainfall will adversely affect the stability of landslides.The greater the intensity of rainfall,the worse the stability of landslides,and the stability coefficient will continue to decrease after the rainfall stops,showing a certain hysteresis.(4)The stability coefficients of the three profiles will reach1.351,1.388 and 1.507 after the landslide is designed with anti-slip pile reinforcement,and the landslide will be in a stable state.The findings of the study can provide a basis for the design of the management plan of this landslide.There are 48 figures,11 tables,and 78 references. |
