岩土力学Issue(2)：466-473,489,9.
Hoek-Brown准则下预应力锚索锚固体破坏的极限分析
Limit analysis of failure mechanism of prestressed anchor cable based on Hoek-Brown failure criterion
摘要
Abstract
Focused on the failure modes of prestressed anchor cables, according to Hoek-Brown failure criterion and associated flow rule, the ultimate pullout force and failure mechanism of anchor cable were deduced through upper bound limit analysis, where bond failure of anchorage body and anchored rock mass failure were considered respectively. The influences of grouting pressures, lengths of anchorage section and rock parameters on ultimate pullout forces and failure mechanisms were analyzed. The results reveal that, increasing anchorage length in a certain extent and using pressure grouting are effective measures to improve ultimate pullout forces of anchor cables. When anchored rock mass failure occurs, ultimate pullout forces will increase with the improving of empirical parameter A, tensile strength, compressive strength and unit weight of rock mass, while it will decrease with the improving of empirical parameter B. The shape of failure surface of anchored rock mass looks like horn, which is consistent with the conclusions of existing literatures;and parameter B is a key factor affecting the shape of failure surface of rock mass;it determines the curvature of failure curved surface;and curved surface will degenerate into circular conical surface when B is equal to 1.关键词
预应力锚索/Hoek-Brown强度准则/塑性/流动法则/锚固体/极限分析Key words
prestressed anchor cable/Hoek-Brown failure criterion/plasticity/flow rule/anchorage body/limit analysis分类
建筑与水利引用本文复制引用
李术才,王洪涛,王琦,王德超,江贝,杨为民,张红军,李为腾..Hoek-Brown准则下预应力锚索锚固体破坏的极限分析[J].岩土力学,2014,(2):466-473,489,9.基金项目
国家自然科学基金青年科学基金项目（No.51304125，No.41102184）；高等学校博士学科点专项科研基金（No.20130131120090）；山东省优秀中青年科学家科研奖励基金（No. BS2013NJ004，No.2012M511028）。 （）
