Research Based On Mindlin Solution For Muti-anchorage Effect Of Rock Anchor

Rock anchor has a very extensive application in the geotechnical engineering.Underground geotechnical reinforcement engineering, the management of all kinds ofslope engineering, all sorts of foundation reinforcement engineering of structures areused in large quantities for the anchor. At present the study of rock anchor mainly focuson the stress and strain state between the anchor and mortar, mortar and rock. Butfailure mode of surrounding rock and rock anchor force distribution of the rock masssurrounding rock anchor is still less, and the relevant literature is also quite limited.It is generally believed that the shear stress of anchor transmit in an area likecone.The conclusion is a assume based on a series of failure experiments, and it don’thave reliable theoretical basis. Most of the research on multi anchorage effect bysuperimposed stresses are based on the assume.This paper study on the strain state ofthe rock around rock anchor on the basis of a lot of reading and a comprehensiveanalysis of existing relevant literature. A simplified anchoring section shear stressdistribution model based on Mindlin solution is approved. Using the Mindlin solution inPoint vertical semi-infinite elastic body in semi-infinite plane,got the additional shearstress of rock anchor at any point in the body according to the principle of superposition.And the strain stress of rock can be obtained combined the model with superimposedstresses. The reduction of the capacity of central anchor is researching by calculating theadditional shear stress. Then a calculation method that has practical significance isapproved to calculate anchor under multi anchorage effect. The method was verified byFLAC3D,and was used in an example.