| The working mechanism of pressure-type anchor under horizontal load is complex,and there are many factors that affect its anchoring effect,so the mechanical performance of pressure-type anchor still needs to be further studied.On the basis of verifying the previous research results,and from the point of view of the combination of micro-force and macro-force of pressure-type anchor,this paper adopts the combination of numerical simulation analysis software and indoor model test to further explore the stress characteristics of pressure-type anchor under horizontal load and optimize the design parameters.The main results are as follows:(1)Meso-analysis of numerical simulation of bearing characteristics of pressure-type anchor.Through the discrete element analysis,the mechanical characteristics of pressure-type anchors under horizontal load are obtained,and the meso-changes of load-bearing characteristics are revealed by the changes of porosity,coordination number and rotation.Through the change of the normal and axial contact of the particles,the soil particles in different forms are affected by the action of the anchor in the form of rose diagram,and the bearing characteristics and influence level of the anchor are further revealed.Through the force analysis of the anchoring plate,this paper probes into the bearing function of the anchoring plate under different working conditions.(2)Study on structural design optimization of combined strengthening of pressure anchor and thin-walled retaining wall.The pressure anchor and the retaining wall are combined to carry out the numerical simulation under multi-factors and multi-working conditions,the effects of different retaining wall height,retaining wall position,retaining wall size,anchor height,anchor spacing,anchor plate related design parameters and other factors on the mechanical characteristics of the retaining wall are obtained.(3)Study on the effect of combined reinforcement of anchor and retaining wall under different combinations.On the basis of setting the retaining wall,three anchors are arranged,and the three anchors are arranged in the same horizontal direction and vertical direction to explore the effect of combined reinforcement of multiple anchors and retaining wall under two different combinations,so as to realize the optimization of structural design parameters of pressure anchor and thin-walled retaining wall.(4)Study on bearing characteristics of pressure anchor based on indoor model test.The model test scheme of pressure anchor is designed,and the main contents such as test model size,test material,horizontal loading scheme and monitoring method are determined reasonably.In the experiment,the advanced microscopic digital camera visual tracking technology and half-mold anchor are used to analyze the influence of pressure anchor on the evolution of soil particle movement under horizontal load,and preliminarily explore the group anchor effect formed by the joint action of multiple anchors. |
