The Study On Evolution Characteristics Of Deformation Field Of Anchorage System

In this subject study of the evolution characteristics of deformation field of anchorage system in geo-technical engineering,based upon intensive study of experimental analysis,theoretical analysis,numerical analysis.Series research findings were achieved in this paper,which are as follows:(1)To cite a digital speckle correlation methods(DSCM)which applied to nonuniform field base on the traditional DSCM,the results shows that it can be used to calculate and analyze the speckle images collected in the experiment.(2)According to the experimental requirements,self-made experiments loaded support bracket,and experimental study on bolt pull-out of semi-cylindrical test model by manual pull-out instrument.By using DSCM which applied nonuniform field to research the evolution characteristics of deformation field of anchorage system based upon the bolt pull-out experimental.Mainly analyzes the deformation field of the anchoring system during the experiment of the bolt pull-out process,and deeply studies the anchorage failure and the anchorage failure evolution caused by the interfacial sliding between the anchoring agent and the surrounding rock,The result shows that during the process of bolt pull-out,the pull-out force is transmitted from the anchoring end to the inside.The deformation of the anchoring system is mainly concentrated at the interface,and the deformation area gradually increases along the anchoring direction with the increase of the pull-out force.The interfacial stress extends along the anchorage;The distribution of the interface is nonuniform and the law of monotonically decreasing is presented first,and then the distribution law is increased first and then decreases.The interface sliding value and the sliding velocity show decreasing distribution along the anchorage section.The shear stress and plasticity of the interface between the surrounding rock and the anchor The correspondence of area width.(3)To revise the distribution law of interface stress according to the load transfer theory and the pull-out experimental,gained the modified formula of distribution law of interface shear stress.The results show good agreement with the experimental through data analysis.The factors that affect the distribution law of shear stress were analyzed as well.(4)According to the modified formula of experimental and theory,the cable element in FLAC3D was modified,to compare and analyze the initial model and the modified model of cable unit can be concluded that the modified model is more practical.