Research On The Dynamic Response Characteristics Of Anti-slide Piles With Anchor Cables For Strengthening The Slope Of Accumulation Body

Due to a series of advantages such as small-scale masonry,flexible location setting and outstanding seismic performance,anchored stabilizing pile has been widely used in railway,highway and other engineering fields in the past 20 years.However,due to the relatively complex force transfer mechanism of this structure,a series of fundamental problems such as dynamic response characteristics,pile-anchor-soil dynamic coupling mechanism are still rarely studied.In view of this,based on the methods of laboratory test,shaking table test and theoretical analysis,the dynamic response characteristics of the slope reinforced by anchored stabilizing piles were studied,and the dynamic equations of the pile-anchor-soil coupling structure were deduced.The main research content are as follows.(1)By summarizing related theories of predecessors,the similar design of the shaking table test was completed,and the influencing factors of similar materials of the model piles were studied.On this basis,the shaking table test of slope reinforced by anchored stabilizing pile was completed.The test content is the Earthquake earth pressure,dynamic strain and acceleration response of the sliding block structure under the two El-Centro wave and Wolong wave.(2)Based on the shaking table test,the dynamic response characteristics of the slope reinforced by slope reinforced by anchored stabilizing pile were analyzed,and change trend of the dynamic soil pressure and the strain at the cantilever section of the model pile was summarized,the maximus strain occurs at the junction of the anchoring part and the cantilever end of the stabilizing pile,and the maximum dynamic earth pressure occurs at the top 4/5 position of the pile body.In addition,the change trend of the acceleration amplification factor in the elevation and horizontal direction of the sliding body is analyzed.The acceleration amplification factor increases with the increase of the elevation and reaches the maximum near the top of the slope,while the amplification factor increases with the height.The distance from the measuring point to the pile increases and gradually becomes smaller.(3)Based on the HHT and marginal spectrum theory,the dynamic failure mode of slope reinforced by anchored stabilizing pile was analyzed,and the failure development rules of the slope reinforced by anchored stabilizing pile under ground motion were obtained.The analysis results are in good consistent with the experimental site observations,which shows that this method can be well applied to the analysis of failure modes of nonlinear structures.(4)Based on Winkler theory the pile-anchor-soil dynamic interaction model and the derivation of dynamic coupling equations were completed.The study considers stabilizing piles as beams on elastic foundations,replace the anchor by the springs and damps,and then considers the soil as a one-dimensional shear elastic soil model,and couples the dynamic response of the soil to the anti-sliding pile structure,and finally obtained the analytical solution of the equation.