摘要
针对采掘叠加应力作用下,由于支护时机不合理导致回撤通道围岩灾变失稳问题频繁发生严重影响综采设备安全高效回撤的技术难题,以棋盘井煤矿I030901工作面回撤通道为研究背景,将剩余煤柱应力演化的五个阶段建立剩余煤柱力学模型,将实测参数带入公式后理论确定了叠加应力的起始扰动范围为102.48m。在此基础上,建立FLAC^(3D)数值计算模型反演了工作面前方应力传播规律及剩余煤柱上方垂直应力的叠加影响机制。考虑到作业工序及生产条件影响取富裕系数为1.5,最终确定剩余煤柱宽度小于150m之前,需要对回撤通道完成超前加固。现场实测结果表明,超前应力影响范围为100m左右,模拟结果与理论计算结果具有一致性。
In view of the technical problem that under the action of mining-excavation superposition stress,the catastrophic instability of surrounding rock in the withdrawal channel is frequently caused by unreasonable support timing,which seriously affects the safe and efficient withdrawal of fully mechanized equipment,the withdrawal channel of I030901 working face in Qipanjing Coal Mine is taken as the research background,the mechanical model is established for the five-stage stress evolution of residual pillar,and the measured parameters is input into the formula to determine the initial disturbance range of superposition stress in theory as 102.48 m.On this basis,the FLAC^(3D) numerical calculation model is established to invert the stress propagation law in front of the working face and the superposition effect mechanism of the vertical stress above the residual pillars.The results show that the simulation results are consistent with the theoretical results.Taking into account the influence of working procedures and production conditions,the abundant coefficient is 1.5,and it is finally determined that,the advance reinforcement of withdrawal channel should be finished,before the width of remaining pillars is less than 150 m.The field test results show that the influence range of advance stress is about 100 m,and the simulation results are consistent with the theoretical calculation results.
作者
娄杰
徐严军
柏建彪
张栋
李斌
卞卡
刘峰
LOU Jie;XU Yan-jun;BAI Jian-biao;ZHANG Dong;LI Bin;BIAN Ka;LIU Feng(Qipanjing Coal Mine,Shenhua Mengxi Coal Chemical Co.,Ltd.,Ordos 017000,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Xuzhou 221116,China;Institute of Mining Engineering and Geology,Xinjiang Institute of Engineering,Urumqi 830091,China;Yangzhou Zhongkuang Construction New Material Technology Co.,Ltd.,Yizheng 211400,China)
出处
《煤炭工程》
北大核心
2022年第8期84-90,共7页
Coal Engineering
基金
国家自然科学基金项目(U21A20107,51927807)。
关键词
综采工作面
叠加应力
剩余煤柱
回撤通道
超前加固
fully mechanized working face
superimposed stress
residual coal pillar
withdrawal channel
advance strengthening
