Earthquake Permanent Displacement Calculation And Dynamic Response Analysis Of Loess Slope Strengthened By The Frame Prestressed Anchor

In today’s era,social civilization is progressing rapidly,scientific and technology is booming.A large amount of infrastructure construction have been carried out in the northwestern loess area.However,natural disasters such as earthquake activities have brought more and more serious economic losses and personal injuries to human society.In order to reduce the degree of damage to infrastructure in the loess area by seismic activity,some effective reinforcement measures are needed.At the same time,due to the economical and convenient construction of the frame prestressed anchor,applica tion in the slope engineering of the loess area has become more and more extensive.In order to better improve the seismic performance of the slope supported by the frame prestressed anchor,it is necessary to study the failure mechanism of the slope supported by the frame prestressed anchor under the action of earthquake.By analyzing the seismic permanent displacement and displacement changes of loess slopes supported by the frame prestressed anchors under earthquake action,combined with numerical simulation to analyze the dynamic response law of slopes,the failure mechanism of slopes supported by the frame prestressed anchors can be studied finally.The research work done in this paper is as follows:(1)Based on the calculation principle of the Newmark method,considering the attenuation of soil strength and the prestress of the frame anchor rod,the Spencer method and the Sarma method are combined to calculate the yield acceleration of the supporting slope under the action of the earthquake,and then calculating The earthquake permanent displacement value of the frame prestressed anchor supporting the loess slope is obtained,and the MATLAB calculation program is compiled to calculate the earthquake permanent displacement value.Numerical simulation analysis is carried out with a concrete engineering example as a model,which verifies the rationality of the method,and discusses the influence of soil cohesion and internal friction angle on the earthquake permanent displacement value of the supporting slope.(2)Using the finite element software PLAXIS 3D,numerical simulation analysis is carried out on the basis of specific engineering examples,and the dynamic response change rules of the frame prestressed anchor supporting loess slope under the action of earthquake have been studied,as also as the axial force of the anchor rod,the slope displacement,The slope acceleration response and the slope stability changes,and the dynamic stability and failure mechanism of loess slopes under the action of the frame prestressed anchor have been discussed.(3)With the aid of the finite element software PLAXIS 3D,the frame prestressed anchor is used to reinforce the loess slope,which further verifies the rationality of the method in this paper.The results show that by increasing the length of the anchoring section of the frame prestressed anchor,adjusting the value of the anchor spacing and reducing the inclination angle between the anchor and the horizontal plane,the stability of the loess slope supported by the frame prestressed anchor rod will be appropriately improved.The influence of anchoring parameters on the permanent displacement of loess-supported slopes during earthquakes is discussed,which makes some contributions to the seismic design of slope-supporting projects in the future.