Dynamic Stability Analysis Of Anchored Slope Under Earthquake Action

Slope mostly act as a subsidiary part of the construction project,the stability of the construction and use of the process directly affects the safety and success of construction projects.Moreover,our country is an earthquake-prone countries,high intensity and wide range of earthquakes have occurred,how can effectively ensure the slope's security and stability during an earthquake in the area of geotechnical engineering,earthquake engineering and other disciplines is a important research project.Prestressed anchor support methods now widely used in the world and achieved obviously results.This article will use this technology,study on Dynamic Response of Slope Prestressed Anchor Rope by Indoor Impact Load Test,at the same time,investigated the actual slope engineering under earthquake conditions,the dynamic response of the slope under different ground motion parameters and the supporting effect of prestressed anchor cable are analyzed by finite element software ANSYS and FLAC3 D.Finally,according to the indoor test and numerical simulation of the prestressed anchor cable axial response characteristics,proposed some new anti-seismic anchors at home and abroad,analyzed their working mechanism and working characteristics of earthquake resistance.The main research results are as follows:(1)Analyzed the mechanical properties of the prestressed anchor cable,and summarizes the failure form of the prestressed anchor,given the evaluation formula of each failure form of anchor solid,and deduced the stress distribution and strain distribution of stress anchors.(2)According to the cable tension changes statistical analysis of the impact load test results,plotted the response curves of anchor cable under different working conditions.Through the study of the law of the curve summed up the tension load applied to the moment the mutation in the test phenomenon.(3)In this paper,the actual slope engineering in the numerical simulation after input the seismic wave presented a significant acceleration amplification effect.The overall law is the acceleration amplification factor nonlinear increase along the elevation.The peak of the acceleration amplification factor appears at the top of the slope,and the same elevation slope acceleration amplification coefficient is greater than the slope of the internal body.The greater the acceleration amplitude;the smaller the amplification factor;the change in the acceleration magnification factor at different operating times is basically the same;there is no obvious internal correlation between the acceleration amplification factor of the seismic wave under various frequency or spectral characteristics.(4)The design of the slope engineering example is carried out by using three kinds of prestressed anchor cable spacing,including 3m×3m,4m×4m and 5m×5m.Compared stress cloud and horizontal displacement cloud before and after support,have reduced to varying degrees.This phenomenon indicating that the reinforcement effect is good.The smaller the spacing,the more intensive the prestressed anchor is arranged,the more obvious the reinforcement effect;the horizontal displacement of the slope decreases with the decrease of the spacing;the axial force of prestressed anchor cable increases with the increase of spacing;the abrupt change of axial force was found by observing the time course of anchor cable during seismic action,so,the conclusion of the impact load test are confirmed.(5)Three kinds of new type of seismic anchoring device are proposed,which are adaptive anchor cable,constant resistance large deformation anchor rod and D anchor rod,summed up the structure design concepts and the use of features of the three.Analyzed the working characteristics and mechanical properties of the three seismic anchors,put forward their anti-explosion in the national defense,cave excavation,strong earthquake building foundation and other engineering areas of applicability.This paper is the reinforcement design and stability analysis of an actual slope engineering,its analysis process and conclusions have some reference value for the support design of other similar slope engineering;In the same time,the analysis and summarization of the new seismic anchors' working characteristics of are given in this paper will provide some reference for the future research and select of seismic support engineering.