大采高工作面回撤通道间隔煤柱失稳机理  

Study on Failure Mechanism of Interval Coal Pillar in Withdrawal Channel of Large Mining Height Working Face

作　　者：周辉 谢福星 ZHOU Hui;XIE Fuxing(Changzhi Sanyuan Zhongneng Coal Industry Co.,Ltd.,Changzhi 046600,China;Beijing China Coal Mine Engineering Co.,Ltd.,Beijing 100013,China;Mine Construction Research Institute,China Coal Research Institute,Beijing 100013,China)

机构地区：[1]长治三元中能煤业有限公司,山西长治046600 [2]北京中煤矿山工程有限公司,北京100013 [3]煤炭科学研究总院建井研究分院,北京100013

出　　处：《煤矿安全》2019年第10期216-220,共5页Safety in Coal Mines

基　　金：国家自然科学基金资助项目（51804129,51604114）;北京中煤矿山工程有限公司自立科技资助项目（BMCZL011901,BMCKY011805）

摘　　要：为解决某矿2301大采高工作面回撤通道围岩稳定性差、非对称变形破坏严重等难题,应对对其关键承载部分--间隔煤柱的失稳机理开展系统研究。综合运用数值模拟、理论力学分析、数学建模等研究方法,分析了2301大采高工作面回撤通道煤柱内支承应力及塑性区分布规律的柱宽效应,建立"煤柱-顶板"结构力学模型,基于尖点突变理论建立并解析煤柱突变微分方程,进而计算出2301工作面间隔煤柱临界突变灾变宽度为4.1m,且数值模拟计算结果与理论计算相吻合,即间隔煤柱留设最小宽度应大于4.1m。To solve the problems of poor stability and serious asymmetrical deformation in equipment withdrawal channel at the2301 face with large mining height,it is necessary to carry out a systematic study on the failure mechanism of the key bearing part,the interval pillar.The pillar width effect of supporting stress and plastic zone distribution law in the pillar was analyzed by means of numerical simulation,theoretical mechanics analysis and mathematical modeling.By establishing the structural mechanics model of"pillar-roof",the differential equation of coal pillar catastrophe is established and analyzed based on cusp catastrophe theory.Furthermore,the critical catastrophe width of the 2301 working face coal pillar is calculated to be 4.1 m,and the numerical simulation results are consistent with the theoretical calculation results.Therefore,the minimum width of interval pillar should be greater than 4.1 m.

关 键 词：设备回撤通道 失稳机理 柱宽效应 尖点突变 临界宽度 

分 类 号：TD323[矿业工程—矿井建设]