Study On Model Tests And Numerical Simulation Of Stability Of Powder Clay Slopes In The Reservoir Water Level Subsidence Area

In recent years,the country and its people have an increasing demand for energy,and the number of hydroelectric power stations and reservoirs is increasing.The regu lation of reservoir water level will have different degrees of impact on the surroundin g geology,groundwater,organisms and even ecosystem.Landslides are one of the maj or geological hazards,which are prone to cause casualties and economic burdens whe n formed,therefore,it is of great practical significance to study the stability change la w of landslides and their formation mechanism.This paper takes the landslide of Liul an junction in Miaowei Township,Dali Prefecture as the background,uses the combin ation of indoor model test analysis and numerical simulation analysis to analyze the in fluencing factors of the slope instability of Liulan junction,and establishes the geolog ical model of Liulan junction with reservoir water level as the variable,conducts mod el test,and then analyzes the two-dimensional seepage field,two-dimensional three-di mensional displacement field and stability coefficient change by numerical simulation to get the stability of landslide change law.The main research contents of the paper ar e as follows:Translated with www.Deep L.com/Translator(free version)(1)Reviewing the rel evant engineering geological and hydrogeological data of the prototype and through r elevant monitoring data,we obtained that the landslide formation is influenced by geo logical factors and water level rise and fall factors.(2)Taking the landslide at Liulan junction as the prototype,a geological model te st of the landslide at Liulan junction was established based on similar theory.By desig ning different water level rise and fall conditions,the model test obtained the changes of soil pressure,pore water pressure and slope damage on different monitoring surfac es of the slope under different water level rise and fall,and obtained that water level ri se and fall has the greatest influence on the leading edge of the landslide,and the stabi lity of the decline process is lower.(3)According to the saturated-unsaturated theory and the limit equilibrium meth od,GEO-Studio numerical simulation software was used to establish a two-dimension al finite element model for the landslide at Liulan junction,and the changes in the see page field,infiltration line and stability coefficient were obtained,and it was conclude d that the landslide was basically stable during the water level rise and seriously desta bilized during the initial water level fall,The minimum stability is 0.9.(4)According to the saturation-unsaturation theory and the intensity reduction m ethod,the three-dimensional finite element model of the landslide at Liulan junction was established by using Midas GTX NX numerical simulation software,and the vari ation laws of seepage field,displacement field and stability coefficient were obtained,which concluded that the stability of the water level rises firstly and then falls,and the stability of the water level falls firstly and then rises.