The Model Test Research On Deformation Evolution Of Traction Landslide

On the traction landslide deformation evolution research,the literature is less.At present to a certain extent,the researchers reached some consensus.Traction landslides are generally caused by factors such as erosion or excavation of the foot.The unfavorable factors lead to the instability of the traction area.With the increase of the deformation,traction area trailing edge support weakened or even empty.The landslide gradually develops backwards,eventually forming a large landslide body.At present,there is no same standard for the classification and landslide evolution of traction landslide.Physical model testing is an important means of slope research,which can be used to simulate a variety of conditions.In this study,the traction landslide model test device was used to test the traction landslide physical model under different working conditions.Based on the physical model test method,the traction landslide physical model test under different working conditions was carried out by using the self-designed traction landslide model test device.The experiment was carried out by means of camera,3D laser scanner and stress acquisition device.The main conclusions are as follows:(1)The model test realized the staging process of traction landslide.Through the experiment,we know the order of each crack and the crack evolution process.The feasibility and rationality of the designed traction landslide model test are verified,and the feasibility of the traction-type landslide support is proved by the test method.(2)By comparing the traction-time curve and the Crack penetration ratio-time curve in the landslide model test,we divide the traction landslide deformation process into five stages: initial deformation stage,uniform deformation stage,accelerated deformation stage,stable deformation stage and integral sliding stage.(3)We summarize the time and space distribution of various types of landslide cracks in traction landslide,at the same time,we counted the percentage of the evolutionary stages of the trials.Combined with the crack penetration ratio-time curve,we have come to the conclusion that the penetration ratio reaches 40% as a warning value for landslide.