Research On Characteristic Model And Stability Of Rock Slope Sliding Surface

Landslide is a phenomenon of deformation and destruction of slope rock mass under natural or man-made influence.It is one of the main geological disasters and will bring many adverse effects to the lives of people in the area affected by the landslide disaster.The slip zone(surface)is an important part of the slope rock mass,and the shear strength of the slip zone(surface)is an important parameter that affects the occurrence of landslides.Its strength mainly depends on several characteristics,including the mineral composition of the soil or rock,the nature of the pore-filling fluid,and the location where shear occurs.The strength of the slip zone(surface)determines the stable state of the slope rock mass.The accurate determination of the strength of the slip zone(surface)is of great significance for the stability analysis of the slope rock mass.The purpose of this paper is to further study the change law of the shear strength(surface)of rock slopes and the reasons for the change of shear strength based on previous studies.According to the structural characteristics of the sliding belt(surface),the friction model of the sliding belt(surface)of the slope rock mass is proposed to study the change of the shear strength of the sliding belt(surface)during the shear process.The main research results of this article include:1 Based on the existing friction model,a U-shaped friction model is proposed.By defining the friction of the contact surface of the structure of the sliding belt(surface),the friction coefficient change formula is obtained,and the influence of the change of the relevant parameters in the formula on the friction coefficient is analyzed.Each parameter only affects the value of the friction coefficient.,Has almost no effect on the change of friction coefficient.This model can simulate the changing process of the friction coefficient as the shear displacement increases during the shearing process of the slope shear surface.The rationality of the model is verified by the corresponding ring shear test.2 Based on the shear specimen of the ring shear test,a simplified model of the ring shear specimen is obtained.The model macroscopically describes the whole process of sliding surface penetration failure and the change process of shear strength during the shearing process of the sliding belt(surface)in the ring shear test.The rationality of the model is verified by the corresponding ring shear test.During the change of the shear strength of the sliding belt(surface),the changes of the three parts: friction part,cohesion part and internal friction angle part.3 According to the proposed U-shaped friction model and the simplified model of the ring shear sample,the reason for the decrease in the shear strength of the sliding belt(surface)is calculated and analyzed.During the reduction of the shear strength value of the sliding belt(surface),the strength values of the three parts of cohesion,internal friction angle and friction part and their proportion in the shear strength value of the sliding belt(surface).4 According to the change law of the friction coefficient of the sliding surface obtained in the proposed U-shaped friction model,it is applied to the traditional calculation method,and then an improved calculation method of the stability coefficient is obtained.The improved stability calculation method can calculate the stability coefficient of each stage of the slope according to the different friction coefficients of the sliding belt(surface),and then obtain the change law of the slope stability coefficient.