Study On The Instability Mechanism And Prevention Effect Of A Long And Slowly Inclined Bedding Slope

The paper takes the landslide of the east station of a certain line as the research object,and uses the indoor centrifugal model test as the research method.The instability model and the support model are tested by the geotechnical centrifuge of Southwest Jiaotong Univer sity to study the stability of the long and gentle slope.The stress and deformation characteristics of the landslide are analyzed by numerical simulation,and the results of the centrifugal test are mutually verified.The main research contents and conclusions of the thesis are as follows:1.Through detailed site survey data,find out the engineering geological conditions of the landslide at the east station of a line,and select a classical geological section to establish a centrifugal model based on the actual situation of the project.Based on the dimensional analysis method,considering the size of the model box,the physical and mechanical parameters of the similar materials required for the test are derived,and the appropriate test materials are selected for the corresponding proportioning test.Finally,the model is completed according to the corresponding manufacturing process.2.Through the centrifugal model test,the instability mechanism of the landslide at the east station of a certain line is studied.The surface displacement of the slope,the development of the slope crack,and the deformation of the side wall of the slope are monitored and recorded,and the acceleration is increased.The trend of the slope displacement,the law of the development of the fracture and the deformation of the side wall of the slope.3.Through the centrifugal model test,the support effect of the double-row pile support of the east station landslide of a certain line is studied.The test monitors and records the displacement of the slope,the development of the crack,the displacement and stress of the pile body,and obtains The displacement and deformation trend of the slope after support,and the variation of the pile body stress with time.4.Through FLAC 3D software,the 3D numerical modeling of the landslide at the east station of a line is carried out,and the slope excavation,slope cutting and support are simulated and analyzed,and the characteristics of plastic zone,displacement and stress are changed with the slope condition.The trend was changed and the rationality of the results of the centrifuge test was verified.