Dynamic Response Law And Failure Mechanism Of Bedding Rock Slope Under Earthquake

With the advancement and implementation of China's the Belt and Road Initiative and the great western development strategy,many construction projects are facing the threat of geological disasters such as earthquake landslides.The relevant seismic stability problem of bedding rock slope has been widely concerned by academic and engineering circles.Therefore,it is undoubtedly of great theoretical significance and engineering application value to study the dynamic response law and failure mechanism of bedding rock slope under earthquake.Based on the shaking table test,the failure mechanism of bedding rock slope under earthquake is explored.The acceleration response law of bedding rock slope is explored,and the dynamic response analysis of the slope under earthquake is carried out with Woqian landslide as the engineering background by using FLAC^3D.The main work of the paper is as follows:?1?Based on Wenjiagou landslide in Mianzhu City,Zhengjiashan landslide in Pingwu County,and Tangjiashan landslide in Beichuan County induced by Wenchuan earthquake,the following three slope models of different slope shapes are generalized:steep-upward and gentle-downward concave slope,gentle-upward and steep-downward convex slope and straight-line slope.?2?The shaking table test for the bedding rock slope of geometric similarity ratio 1:100and straight-line slope shape is designed and completed.The result indicates that the failure mechanism of bedding rock slope under earthquake is rock mass loosening of slope shoulder and slope top?rock mass of slope toe shear extrusion failure?rock of slope surface bedding slipping?integral failure of slope.?3?For the generalized slope model,the dynamic response analysis under earthquake based on FLAC^3D is carried out.By comparing with previous research results,the correctness of the numerical simulation is verified.?4?By using ubiquitous-joint constitutive model to consider the distribution characteristics and physical and mechanical properties of the inner bedding planes of bedding rock slope and analyzing different working conditions,the influence of duration of seismic wave,slope structure,mechanical parameters of bedding planes and vertical seismic input on acceleration amplification effect of bedding rock slope are explored.The result indicates that slope structure,cohesion and friction angle of bedding planes,and vertical seismic input have a significant impact on the dynamic response of bedding rock slope.?5?By establishing the model of bedding rock slope with weak interlayer,the influence of weak interlayer and parameters of seismic wave on the acceleration response of bedding rock slope with weak interlayer are explored.And through the comparative analysis with the slope without weak interlayer,the law of variation of acceleration amplification coefficient in the weak interlayer region is further explored and the negative effect of weak interlayer is analyzed.The research indicates the acceleration amplification coefficient increases faster in the weak interlayer region,and the acceleration amplification coefficient changes significantly in the case of different weak interlayer structures and parameters of seismic wave.?6?Taking Woqian landslide as engineering background,the numerical model of dynamic analysis under earthquake is generalized.The stability of slope is verified in the natural state,and the dynamic analysis of slope under earthquake is carried out by input of Wolong waves from five aspects:acceleration,velocity,displacement,maximum principal stress and plastic zone.The research indicates that the dynamic response of slope presents"rhythmic"change and surface effect,and the failure mechanism is tension-shear slipping failure.