The Numerical Simulationstudy Of 12# Landslide Movement Process And Mechanism In Panzhihua Airport

Panzhihua Airport 12 # landslide is located in the eastern part of the airport on the eastern side of a wide area of the remaining area of about 510 × 104m3,by the filling body instability,the lower Yujiaping old landslide from the resurrection.As the volume of the body is relatively small relative to the volume of the old landslide in Yijiaping,from the longitudinal length,the former is only equivalent to the latter 1/10,and why the volume of such a small body can lead to The resurrection of the old landslide,from the influencing factors to the internal mechanics process,is worthy of further study.Based on the study of the physical geography and geologic environmental conditions in the study area,as well as the deformation of the landslide and the resurrection of the old landslide,the changes of the 12 # landslide and the 12 # landslide failure process are analyzed by numerical simulation.Trying to reveal the 12 # filling body instability and Yi Jiaping old landslide resurrection mechanism,to enrich people on the mountain airport "high fill body instability-low landslide resurrection" this disaster chain mechanism of understanding.Achieved the following results:(1)This paper describes the conceptual model analysis of the failure of the filling body and the resurrection mechanism of the old landslide.The long-term rainfall causes the filling body to soften and soften the water.Under the action of groundwater seepage,the filling body is constantly deformed and eventually destroys.(2)The seepage-stress field of 12 # landslide before and after rainfall is analyzed by seep.The change of groundwater level at the foot of the slope is the most obvious,and the permeability of the filling body,sandstone and old landslide has different influence on the seepage field.(3)The failure of the filling body and the resurrection process of the old landslide are analyzed by the pellet flow software PFC2 D,which indicates that the failure of the filling body is overlying the old landslide in the form of collapse,and the impact force of the old landslide is Posterior,in the vertical direction with the depth of the role of reduction.(4)The results show that the residual slope of the residual slope is in the creep state under the natural condition,and the stress-strain change is the most obvious at the trailing edge of the residual slope,And finally again resurrection resurrection.