Slope Stability Analysis Based On Flac3D Limit Equilibrium Method

China is the largest developing country in the world, but also has the largest national transportation and civil engineering. With the development of our country’s economy and the construction of the city,the construction and the construction of the road network, the railway network, the construction, the plant area, and the water conservancy facilities are also increasing.In recent years, the constant expansion of the city makes the land resources more valuabale and deficiency.More and more projects have to choosen the mountainous and hilly areas to carry out their constructions and projects.There are lots of problems in the moutainous and hilly areas,and the influence of the construction and the people’s life is more and more close.A series of instability problems appear more and more frequently, the formation of the landslide, landslide, debris flow and other disasters are more and more serious.As the serious and widespread slope instability caused,how to effectively prevent and evaluation of the slope stability have become the common concern of the engineering and research direction.Effective evaluation of the slope stability can not only early disaster prevention.Effective evaluation of the slope stability can not only preventing disaster early,but also can evaluate wether the slope area is able to develop and achieve long-term use.This can predict and evaluate development of road and regional construction of mountainous area in our country. So it has important practical significance in the development.This paper based on the slope landslide of Chenggong, Kunming City, Yunnan Province,through the understanding and the collection of road slope occurs before the massive destruction of soil parameters, analysis and calculation of the stability and sliding trend;then according to the possible cause of landslide rainfall conditions.,analyse the actual mass destruction of the specific situation, draw the rainfall of stability, and the actual damage confirmed the accuracy of the analysis.Firstly, before the occurrence of large-scale landslides in the field to investigate and take pictures.Before the landslide,Sampling and sampling of soil samples at different slope steps and different levels through a ring knife,then uses them to do the experiment so that could gain the physical and mechanical parameters of soil through soil routine test and direct shear test.According to the geometric size of the slope and the physical and mechanical parameters of the soil,Using Flac3D software to establish the slope of the Moore-Kulun model. Setting initial conditions and boundary conditions according to the failure trend of the slope and the size of the model,and then using the limit equilibrium method based on the strength reduction of Flac3D to analyze and solve the safety factor of the slope. Simulating the ritical state of slope failure so that can gain displacement, strain, strain rate, and maximum unbalance force of landslide,and evaluate the stability of the slope according to the obtained safety factor.Using Geo-studio software to simulate the rainfall process which may lead to the failure of the slope.According to the actual rainfall and rainfall duration analysis,through the safety factor, the slope stability changes with the degree of rainfall infiltration.Then determine whether the slope will eventually happen landslide damage.In the end, the slope safety factor and the Geo-studio simulation are calculated by the limit equilibrium method of Flac3D.The process and conclusion of landslide occurrence of slope failure are obtained.The fact that the slope is low stability slope and the failure of rainfall is verified, and the failure mechanism is described.