Study On The Seismic Dynamic Response Of Model Experiment Of Slope Cantilever Anti-Slide Pile

The cantilever anti-slide pile is one of the commonly used measures of slopereinforcement,earthquake is the predisposing factor of instability and failure of the slope and itsanti-slide structure,the stability of the slope and sliding structure under earthquake is one greatconcern to in geotechnical engineering,so,it has important engineering significance to strengthenthe seismic response research of the slope and its anti-slide pile,and reveal the variation ofanti-slide pile’internal force,and research the seismic reinforcement mechanism of slope andanti-slide pile.Firstly on the basis of surveying cantilever anti-slide pile reinforced slope’deformation,failurecharacteristics,form,scale,seismic reinforcement effect in Wenchuan earthquake-stricken area,fortypical slope and its anti-slide pile structures of the earthquake-stricken area as anexample,produced anti-slide pile reinforced slope model according to the similarity principle,dida series of vibration experiment in large-scale shaking table,recorded the slope apparement signsof change,the acceleration response of the slope internal critical point,anti-slide pile bodystrain,the earth pressure and the pile top displacement,analyzed questions about the seismicdynamic response of slope,the static and dynamic stability of anti-slide pile,and the dynamicinteraction between the anti-slide pile and soil.Secondly,did slope prototype simulation using theFLAC3D.The main results are summarized as follows:(1)Acceleration fluctuations increase with the height increasing,this is amplification effect ofseismic response.Acceleration time history of the location of the higher critical point lag thelower,it is “lag effect”.Cantilever anti-slide piles’reinforcement effect on the surrounding soilrestrains the seismic response.(2)The variation of bending moment is similar to the moment distribution curve of cantileverportion of the cantilever beam subjected to distributed load,bending moment shows “convex”shape distribution law which is both ends big and middle small,the maximum moment location isembedded in the solid-side location,the bending moment decreases with the elevation increasesabove the solide-side location.The increased significantly of dynamic additional momentaccounted for more than half of the static bending,indicating that the pile dynamic additionalmoment generated by vibration can not be ignored.(3)Ground-breaking pressure increase with the elevation increasing above the slipsurface,ground-breaking pressure of the following location below slip surface is small.(4)The small spacing arranged cantilever anti-slide pile play better slope reinforcement effectand more effective weakened function to the earthquake response,it can guarantee that the slopehas a good stability when the space of piles is not more than four times of the pile width.