岩土力学Issue(3)：795-800,6.
大断面厚顶煤巷道顶板冒落破坏的上限分析
Upper bound limit analysis of roof collapse mechanism of large section roadway with thick top coal
摘要
Abstract
According to roof collapse characteristics of large section roadway with thick top coal, a failure mechanism of roof collapse block, considering the influences of the stress of surrounding rock and supporting pressure, was constructed based on Hoek-Brown failure criterion and its associated flow law. Through upper bound limit analysis, the roof collapse mechanism of large section roadway with thick top coal was deduced with variational principle;and with one roadway in Zhaolou coal mine, for example, the influences of rock parameters on roof collapse mechanism were also analyzed. The calculation results show that: With the increasing of empirical parameter A, tensile strength, compressive strength and supporting pressure, the size of collapse block increases, while decreases with the increasing of empirical parameter B, the stress of surrounding rock and unit weight of rock mass. The size of collapse block represents the roof stability, larger size means more external work to expend, and the roof is more stable. The parameter B, the stress of surrounding rock and supporting pressure have significant impacts on roof collapse mechanism;and the parameter B determines the shape of failure curved surface; the curvature of failure surface will decrease with the increase of parameter B. Improving supporting pressure is an effective way to increase the roof stability, which provides theoretical basis for the support design of large section roadway with thick top coal.关键词
厚顶煤/顶板/Hoek-Brown强度准则/塑性上限分析/围岩应力Key words
thick top coal/roof/Hoek-Brown failure criterion/plastic upper bound limit analysis/stress of surrounding rock分类
矿业与冶金引用本文复制引用
王琦,王洪涛,李术才,王德超,江贝,张红军,李为腾..大断面厚顶煤巷道顶板冒落破坏的上限分析[J].岩土力学,2014,(3):795-800,6.基金项目
国家自然科学基金(No.51304125；No.51379114)；中国博士后科学基金面上资助(No.2013M540548；No.2012M511028)；矿山灾害预防控制国家重点实验室培育基地开放基金(No.MDPC2012KF11)；山东省博士后创新项目专项资助(No.201301004)；高等学校博士学科点专项科研基金-新进教师类(No.20130131120090)。 （No.51304125；No.51379114）
