Comparative Experimental Study On Deformation Characteristics Of Sliding Zones Of Different Soil Slope

Landslide monitoring and forecasting,especially imminent landslide forecasting,is one of the two major difficulties in current landslide research.For the landslide body,especially the key deformation position,the deformation monitoring of the sliding zone is the most direct and most critical indicator of the imminent sliding prediction.Therefore,obtaining accurate monitoring data of the sliding body,especially the position of the sliding belt,is the fundamental requirement and key to the prediction of the slip.However,our commonly used monitoring methods are often difficult to obtain accurate sliding belt deformation data.This thesis used a landslide test device with a controllable displacement of the slope front edge to realize non-contact measurement of sample deformation through software pixel recognition,and obtain the location map of the characteristic points of the marking belt at any time.The experiment carried out simulation tests and modeling calculations on different working conditions of different viscous homogeneous soil landslides.The purpose was to study the influence of soil viscosity on the progressive failure process,sliding surface and sliding zone characteristics of landslides by changing the soil viscosity.Hope to provide a reference for the engineering community.The main research content and results of this article are as follows:(1)Model tests of three different cohesive soils in two working conditions have confirmed the existence of sliding zones and the development of sliding surfaces,and the landslide changes were tracked.Tests have proved that when the landslide slides down,a sliding zone area with small strain and large thickness was formed first,and then the sliding zone gradually becomes thinner and tightened to form a sliding surface.(2)By observing the thickness distribution of the sliding zone in three cohesive soil landslides under two working conditions,it was found that before the sliding surface at each position penetrated,the front and back of the sliding zone was thick and the middle part was thin.And as the viscosity of the landslide soil increases,the sliding zone becomes thicker and thicker.(3)The thickness changes of the sliding zone of the same kind of cohesive soil landslide have been tracked in two cases,,and it was found that the thickness of the sliding zone showed obvious three-stage changes during the entire slope sliding process: The initial deformation range was relatively large,and it was relatively narrow at the location where the sliding force was greater;in the middle of the deformation,the thickness of the sliding zone changed drastically,the range was more concentrated,and it was in the search state,tending to the weakest position with the narrowest thickness in the whole,generally in the middle part of the landslide;at the end of the deformation,sliding surfaces were formed in the sliding belts at various positions,which penetrated into sliding surfaces and continued to narrow as a whole,and the landslide slipped.(4)Comparing the landslide data of the rock-soil interface with different cohesive soils,it was found that the thickness of the sliding zone changes more obviously as the soil viscosity increases;the tightening position of the sliding zone was closer to the middle of the landslide,and the sliding surface was steeper.(5)Through the use of numerical simulation software for simulation analysis,the accuracy of the above-mentioned law was verified.