采矿与安全工程学报2017，Vol.34Issue(3)：452-458,7.DOI:10.13545/j.cnki.jmse.2017.03.008
水压影响下煤层底板采动破坏深度弹性力学解
Elasticity solution for failure depth of mining floor under water pressure
摘要
Abstract
Accurate estimation of floor failure depth is a key problem in mining above the confined aquifers.However,the popular analytical solution formula at present has not considered the influence of the floor water pressure in engineering practice.Therefore,the analytical solution for stress components of mining floor was derived based on Flamant and Mindlin solutions of elastic half space theory with the floor rock mass considered as a homogeneous isotropic elastic body and the abutment pressure and floor water pressure as uniform strip load on the upper and the lower surface of the floor respectively.,.On this basis,influence of water pressure on the stress distribution was analyzed.According to the stress calculation results,the floor failure depth was calculated based on the Mohr-Coulomb yield criterion with tensile failure,and the influence of the water pressure and thickness of floor aquifuge on the calculation results was discussed.The results of an example have shown that the water pressure has a little influence on the vertical stress and shear stress of mining floor,but it has a great influence on the horizontal stress,which makes the horizontal stress diffuse.The floor failure depth and scope of shear and tensile increase evidently with the water pressure,but only slightly decrease with the thickness of aquifuge.The results have indicated that increasing the thickness of aquifuge cannot effectively reduce the floor failure depth.The application demonstrates that the calculation value of the floor failure depth is basically consistent with the measured value due to considering water pressure's action.And its computational accuracy is higher than that without consideration of the effect of water pressure.关键词
底板突水/破坏深度/解析解/明德林解Key words
floor water inrush/failure depth/analytical solution/Mindlin solution分类
矿业与冶金引用本文复制引用
鲁海峰,姚多喜,胡友彪,孙建..水压影响下煤层底板采动破坏深度弹性力学解[J].采矿与安全工程学报,2017,34(3):452-458,7.基金项目
国家自然科学基金项目(51474008,41472235) （51474008,41472235）
安徽省自然科学基金项目(1508085QE89,1508085ME77) （1508085QE89,1508085ME77）
安徽省高校优秀青年人才支撑计划项目(gxyq2017004) （gxyq2017004）
