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Load transfer laws of tensile anchors in rock masses with weak interlayers based on a shear-slipping updating model

Journal of Mountain Science 2022年第3期19卷 812-825页

作者： WANG Yan XIANG Xin LI Chang-dong ZHU Guo-qiang SONG Cheng-bin XIAN Jin-ye ZHANG Jia-jun Faculty of Engineering China University of GeosciencesWuhan 430074China China Three Gorges Corporation Limited Beijing 100038China Three Gorges Research Center for Geo-hazards Ministry of Education China University of GeosciencesWuhan 430074China

The load transfer characteristics of a tensile anchor in the rock mass with weak interlayers were investigated,considering the nonuniform stress of the horizontally layered rock mass along *** improved shear-slipping model was proposed to describe the stress evolution characteristics of the bolt-rock *** on the improved model,analytical solutions of the axial force,shear stress distribution and load-displacement relationship considering the residual stress stage were *** effects of the stratigraphic sequence,pulling force and bolt diameter on the stress distribution of the anchorage interface were evaluated by using analytical *** results were verified by applying the finite difference numerical simulation *** sensitivity of each parameter to the axial force and shear stress of the rock bolt was determined based on calculation of the sensitivity *** study results show that the axial force and shear stress tend to decrease nonuniformly along the rock bolt towards the anchorage *** to the existence of weak interlayers,the shear stress mutates at the weak and hard rock interface,and the axial force appears to“rebound”at the bottom of the anchored *** has more significant effects on the axial force and shear stress at the bottom of the anchor than at the top of the *** pulling force is more sensitive to the anchor stress than stratigraphic sequence when the bolt diameter is *** study provides a theoretical framework for the fundamental problem of tensile bolts in horizontally or vertically laminated rock masses,providing a theoretical basis for anchor design.

关键词： Weak interlayer Tensile anchor Residual stress shear-slipping updating model Sensitivity

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