深部充填沿空巷道护巷煤(岩)体受力特征及稳定性分析  

Stress characteristics and stability analysis of coal(rock) body in deep back-filling gob side entry

作　　者：刘迅 纪欣卓 苗凯军 LIU Xun;JIXinzhuo;MIAO Kaijun(School of Mines,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2020年第1期32-39,共8页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2018YFC0604701);国家自然科学基金项目(51874281);江苏省研究生科研与实践创新计划项目;中国矿业大学研究生科研创新与实践创新计划项目(KYCX19_2174)。

摘　　要：为研究深部充填工作面沿空巷道护巷煤(岩)体受力特征及其稳定性,以山东新巨龙矿1302N-2^#充填工作面为工程背景,通过理论分析、数值模拟和现场实测对沿空巷道护巷煤(岩)体受力特征和围岩变形进行分析和研究。结果表明:通过得出的护巷煤(岩)体的最小宽度计算公式和沿空巷道所受应力初步确定了留巷矸石墙和掘巷煤柱宽度;充填开采留巷围岩变形主要受充实率影响,充实率越小,护巷矸石墙宽度越大,留巷越不稳定,保持留巷稳定的充实率需达86%;采空区充填沿空掘巷时,煤柱越宽其所受垂直应力越大,结合巷道变形和现场实际充实率确定沿空掘巷煤柱留设为5 m。工程实践表明,沿空留巷不能满足使用要求的主要原因是充实率不足,采用所确定的留(掘)巷参数,巷道变形量在合理范围内,证明了所选参数的正确性。In order to study the mechanics characteristics and stability of chain coal(rock) body of gob-side entry in deep back-filling working face, with back-filling working face 1302 N-2 of Shandong Xinjulong Mine as engineering background, the mechanical characteristics of chain coal(rock) body in gob-side entry and the deformation of surrounding rock have been analyzed and studied through theoretical analysis, numerical simulation and field measurement. The results have shown that the width of the gangue wall of gob-side entry and coal pillar of gob-side entry driving have been preliminarily determined by the formula for calculating the minimum width of coal(rock) body and the stress of gob-side entry. The deformation of surrounding rock of gob-side entry retaining in the process of mining is mainly affected by the filling rate. The smaller the filling rate is, the larger the width of chain gangue wall is and the more unstable the gob-side entry is. So the filling rate should reach 86% to maintain the stability of gob-side entry. When goaf is filled with gob-side entry driving, the wider the coal pillar is, the larger the vertical stress is. Based on the roadway deformation and the actual filling rate, the width of coal pillar for gob-side entry driving is set to 5 m. Engineering practice has shown that the main reason gob-side entry retaining can not meet the usage requirements is the insufficient filling rate. When the parameters of gob-side entry(driving) are adopted, the roadway deformation is controlled within a reasonable range, which proves the correctness of the selected parameters.

关 键 词：深部 充填 护巷煤(岩)体 充实率 

分 类 号：TD353[矿业工程—矿井建设]