Analysis And Treatment Of Landslide At The K639+675?835 Section Of Rucheng-chenzhou Expressway

The analysis and treatment for landslide has been an important research topic in geotechnical engineering.It also involves a wide range of disciplines such as geological engineering,road engineering,and engineering mechanics.Highways Landslide is the most common type of geological disasters in China and other countries,and it is affected by many factors.In the natural state,t he slope is in a stable state,but the slope tends to be unstable under the external influence such as heavy rain or human activities.Therefore,the analysis and treatment for highway landslides under complex geological conditions can effectively protect infrastructure and people's lives and properties.This paper focuses on the landslide emergency treatment project at K639+675~835 section of Rucheng-Chenzhou Expressway as a research background,include field investigation,in-situ monitoring,indoor testing,parameter inversion and other research methods.And we analyze the genesis mechanism of landslide and study the shear strength of sliding zone soil to get the comprehensive value through analysis and evaluation of slope stability under different conditions.Finally we propose an effective rescue treatment program.The main research work and results are as follows.(1)The landslide characteristics and forming mechanism of the K639+675~835 section of the Rucheng-Chenzhou Expressway were analyzed in detail.The in-situ monitoring of the landslide cracks and the deep displacement of the embankment was conducted.The deformation trend and instability of the landslide were analyzed.Then the maxium possible locations were identified.Based on the previous information,we inferred the possible features of the sliding surface,such as the shape and the location,and the groundwater level line.(2)In order to obtain the characteristic of shear strength of the typical sliding belt soil,the in-situ and indoor tests were applied.According to the test result,the law of peak shear strength and residual shear strength of the typical soils w as obtained.Based on inverted analysis,the comprehensive shear strength parameters are inferred.(3)In order to determining the physical and mechanical parameters of landslides,a Support Vector Machine(SVM)based on Adaptive Genetic Algorithm(AGA)was introduced,and a numerical simulation was combined with FLAC3 D to establish the optimal model.The optimal model was combined with the monitoring results to invert the physical and mechanical parameters of the soil layer.(4)Finally,taking the landslide of the K639+675~K639+835 section as the research object,the stability analysis of the landsl ide under different conditions was carried out.On this basis,the comprehensive treatment scheme for the landslide was determined through the comparison and selection of different treatment schemes,and the reinforcement design checking calculation was further carried out.The innovation of this paper is to make full use of the indoor test,limit equilibrium method and machine learning method to invert the parameters of the typical sliding belt soil and soil layers of the landslides at the Rucheng-Chenzhou Expressway,and finally we use the results of the previous strength parameters to analyze the stability of the landslide,conducting the treatment plan comparison and reinforcement design check.