运用等效应力法建立压剪型危岩破坏判据的研究  

Study on Establishing Criterion of Pressure-shearing Type Dangerous Rock by Equivalent Stress Method

作　　者：陈洪凯[1] 张金浩 Chen Hongkai;Zhang Jinhao(College of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,P.R.China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074

出　　处：《地下空间与工程学报》2020年第3期827-834,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51678067,51378521,11272185);重庆市首席专家工作室专项经费(201605);重庆市“两江学者”计划专项资金(201309);重庆市研究生教育创新基金(CYB18167)。

摘　　要：基于断裂力学理论,构建压剪型危岩断裂力学模型。模型考虑了主控结构面的贯通段有水压和无水压两种情况,建立了两种情况下主控结构面的非贯通段等效应力场,结合D-P理论,建立了压剪型危岩的破坏判据。算例分析的结果表明:当贯通段无水压作用时,将有关参数代入破坏判据式,即可判定该危岩体是否失稳;当贯通段有水压作用时,危岩体的失稳破坏与水压应力在裂缝尖端产生的应力场距离r有关,只要求得r的具体值,就可以利用破坏判据式判断该危岩体是否失稳破坏。Based on the theory of fracture mechanics,the fracture mechanics model of compression-shear dangerous rock is constructed.The model considers that there is water pressure or no water pressure in the throughthrough section of the main control structure plane,and establishes the force field of the non-penetrating section of the main control structure plane under two conditions.Combined with D-P theory,the failure criterion of the compressionshear dangerous rock is established.The results of example analysis show that the failure criterion can be used to determine whether the dangerous rock mass is unstable or not when there is no water pressure in the connecting section.When there is water pressure in the connecting section,the unstable failure of dangerous rock mass is related to the distance of stress field produced by hydraulic stress at the crack tip.The failure criterion can be used to judge whether the dangerous rock mass is unstable or not.

关 键 词：断裂力学 等效应力 破坏判据 主控结构面 压剪型危岩 

分 类 号：TU452[建筑科学—岩土工程]