Test Study On Strength And Deformation Of Slide Zone In Wanzhou Area Of Three Gorges Reservoir And Its Application

The instability of reservoir landslides is a common geological hazard in the Three Gorges reservoir area.The process of landslides is the process of deformation and failure of landslides.The sliding soil is a weak sandwich between the sliding body and the sliding bed,and its deformation and destruction are affected by many factors.How to reduce the occurrence of landslides and accurately evaluate the stability of landslides is a problem that scholars in various countries have been striving to study.The shear strength of soil is reflected by the shear strength parameters,and the experimental study is an important method to determine the shear strength parameters of the soil.The experimental study mainly uses the control variable method to test and determine the influencing factors.This paper collected the related research literature about the effect of landslide deformation failure and landslide stability,on the basis of sliding zone current research status and existing problems,applying the experimental study,in depth understanding of the deformation characteristics and the changes law of shear strength of the sliding zone under different water content and different shear rate,study on stability of landslides with different moisture rates and different shear rates by numerical simulation,it will provide the basis for researching deformation and stability of the landslide and disaster prevention.The results are as follows:(1)with the increasing of water content,cohesion increasing first and then decreasing,but the internal friction angle gradually decreasing;the deformation region increases gradually and developing to the slope surface;when the water content is 15.6%,the cohesion is maximum,the maximum slope deformation is minimum;when the water content is more than 15.6%,the plastic deformation increased rapidly,and through the rear edge of the slope part.when the water content is 17.1%,the variation of cohesion is maximum;moisture content w=15.6% can be used as the critical point of shear strength parameters.(2)the stress-strain curves are all "hyperbolic" in different shear rates;and the stress-strain curves are similar under the same shear rate and different confining pressures.with the increasing of shear rate,the plastic deformation area gradually increases;The cohesion increases first and then decreases,while the internal friction angle decreases with the increase of shear rate.the stability coefficient increases first and then decreases;(3)in the two different water content,when the shear rate is 0.8mm/min,the plasticdeformation is the smallest,the slope stability coefficient reaches the maximum;when the shear rate is 1.5mm/min the variation regular curve of the shear strength parameter is samilar;when the water content is 17.1%,the plastic deformation area of the slope is greater than 15.6%.(4)according to the stable state of the landslide,the water content w=17.6%can be used as the critical point to study the deformation and failure of the landslide;0.8mm/min can be used as a critical velocity for the study of landslide stability.(5)By comparing the shear strength of slide zone and stability coefficient of landslide under different water content and shear rate,obtain that the effect of water content is greater.