Research On Large-Scale Shaking Table Physical Simulationexperiment Of Steep-Dipping Stratified Rock Slope

Rock slope's dynamic response rules and the process of deformation and failure under seismic loading are difficult and hot to research. Geological hazards research in the WenChuan earthquake's heavy disasterarea shows that, there are many large-scale sliding masses in bedding side slope by heaving and obsequent slope.On the basis of secondary earthquake geological disasters survey in the heavy disasterarea,use 4 geological models(bedding side slope by heaving and obsequent slope with hard and weak rock), 1:100 scale model and the large-scale shaking table with 6m×6m,3-direction,6-freedom degrees to research the four types landslide's dynamic response rules and the process of deformation and failure under seismic loading.Paper focus research the seismic dynamic response parameters such as the timely varying curves of PGA (acceleration amplification factor)and the PGD(peak displacement magnification factor)and the variation of dynamic earth pressure.And proposed the calculation method of the permanent displacement and the damping ratio of the model.The main conclusions are:(1) Hard-rock pour the destruction of the typical angled "fold line", this failure face along the vertical level, face "growth" joints outspread; Bedding slope appeared in major is tenso-shear cracks along the level and joints bedding face to launch, and the upper slope appear typical model "abscesses" in the mid-lower caved in, the deformation of the characteristic; (2) Soft rock slope in the seismic dynamic role pour model upper (about 1 1/2 to 2/3 height above) deforming toward surface bending deformation, cracking; Soft YanShun layer under the action of the slope in vibration of deformation and failure mode is mainly for the "appeared along the level one slip to the end" phenomenon;(3) Acceleration in closer slope top its acceleration amplification coefficient, the greater the acceleration amplification effect vertical direction the dynamic response of the vibration amplitude of the increase as more intense. Overall model vertical load resistance ability to (Z) than resist lateral deformation (X) ability to model horizontal loading, on top of the destruction of bigger than vertical;(4) By the quake of slope elevation is mainly amplification effect by the influence of vertical seismic acceleration, horizontal earthquake force than vertical seismic force for geogrid shoulder (top) acceleration amplification effect strong;(5) Seismic dynamic role in level under 0.3g ~ 0.6g amplitude range slope shoulder acceleration amplification coefficient ratio model other parts of the acceleration amplification coefficient bigger;(6) Models of displacement peak amplification effect most take for slope position, its biggest shoulder peak displacement value can reach peak displacement of the slope feet 2 ~ 5 times, displacement amplification effect also have elevation effects (7) Whether to vertical or horizontal vibration, model in between 0.3 g ~ 0.6 g of peak pressure anticipating the biggest, vertical vibration effect was caused to the vibration level pressure anticipating role.