Analysis Of Expressway Cutting Slope Landslide Causes And Treatment Measures

Several landslides took place in several sections of the expressway in the course of construction,among which the cutting slope landslide in Section K20+500?K20+750 covers an area of around twenty-four thousand square meters.This paper researched the cause of landslide and control measures with anti-slide pile based on a case study of the cutting slope landslide in Section that,ensuring the stability and safety of the project.Firstly,this paper analyzed the engineering geologic features,seismic and hydrogeologic conditions,then identified the morphological characteristics and structural features,as well as the physico-mechanical properties of rock and soil in the side slope,by some means,such as drilling,testing and observation.Then,the formation conditions,dominant factors and occurrence mechanism of the landslide in this section were analyzed,and inferred that this landslide was a shallow slide that took place on the surface of a limestone accumulation body generated in the last landslide due to the excavation of roadbed in the overburden on an old slip mass.Specifically,it was a retrogressive slide that took place under the action of gravity.Secondly,based on two-dimensional numerical analog data obtained with Midas GTS,this paper built a 2D numerical slope model in the condition of waterlogged soil masses to analyze the slope stability,thus coming to a conclusion on the instability of this landslide accident location,Numerical simulation results also reveal the trend of landslide failure.Furthermore,based on an analysis of the landslide reason and the result of 2D numerical simulation,this paper analysis the studied witch can be applied in the various engineering landslide control measures,finally put forward to design anti slide pile and measures of landslide treatment scheme.Finally,anti slide pile measures of landslide treatment schemes need to be solved on anti slide pile layout location and pile length problem.In this paper,the MIDAS/GTS numerical simulation analysis of the slope stability under different pile layout and different anchorage depth and anti slide pile displacement and stress,the final to determine the anti slide pile be emplaced in the lower part of the slope from the slope 165m suitable location and pile length choose 5 times of the pile width of reasonable length,to ensure the effectiveness of the implementation of the project.