Analysis On Formation Mechanism And Treatment Measures Of Jiangyuan Landslide

In this paper,the landslide on the left side of k290 + 285 ? k290 + 485 excavation section of Heda Expressway in Jiangyuan District,Baishan City,Jilin Province,is taken as the research object.The technical methods of data collection,field geological survey,in-situ test,indoor geotechnical test,engineering geophysical exploration and deformation monitoring are used to study the characteristics of Jiangyuan landslide;In view of the Jiangyuan landslide,the finite element model is established to analyze the stability of the slope area in different excavation stages,and the genetic mechanism of the landslide is studied to provide theoretical guidance for landslide treatment,and finally an effective comprehensive landslide treatment scheme is formed.The main achievements are as follows:(1)This paper systematically introduces the engineering geological conditions of landslide formation,and analyzes the material composition and basic characteristics of landslide mainly by drilling combined with engineering geophysical exploration,geological mapping,in-situ test and indoor test.The deformation monitoring system is established to monitor the deformation of the study area.According to the analysis,it can be seen that the landslide mass slides in the direction of the expressway line,and the sliding tends to increase.(2)Based on the comprehensive analysis of the types and properties of rock and soil,rock mass structure and geological structure,topography and geomorphology,meteorological and hydrogeological conditions and human factors,the genetic mechanism of Jiangyuan landslide is revealed.(3)A three-dimensional finite element numerical analysis model is established to simulate the deformation and failure process of Jiangyuan landslide,the safety factor of slope under different working conditions is analyzed,and the breeding and development mechanism of Jiangyuan landslide is quantitatively analyzed.The change of slope shear zone and safety factor before and after cutting excavation is compared and analyzed,which is confirmed by qualitative analysis of landslide genetic mechanism.It is concluded that during slope excavation,shear zone and safety factor change obviously,and rainfall promotes the occurrence of landslide disaster.(4)Based on the calculation and analysis of anti slide piles,an effective comprehensive treatment scheme is determined,which is mainly embedded anti slide piles,supplemented by interception and drainage,masonry protection on slope surface and plant protection.