大采高工作面煤柱扰动下巷道冲击机理及优化设计  

Roadway impact mechanism and optimization design under coal pillar disturbance in large mining height working face

作　　者：许旭辉 何富连[1,2] 李晓斌 吕凯 何常西 李亮 XU Xuhui;HE Fulian;LI Xiaobin;LYU Kai;HE Changxi;LI Liang(School of Energy&Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Tbchnology-Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)能源与矿业学院,北京100083 [2]中国矿业大学(北京)共伴生能源精准开采北京市重点实验室,北京100083

出　　处：《采矿与安全工程学报》2021年第3期547-555,564,共10页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51974317);中国矿业大学(北京)越崎杰出学者奖励计划项目(800015Z1138);中央高校基本科研业务费专项资金项目(800015J6)。

摘　　要：以所研究矿井1-2,2-2煤层大采高开采工程地质条件为背景,以遗留煤柱下2-2煤层22306平巷大变形破坏为主线,通过理论分析和数值计算研究大采高工作面煤柱扰动下底板巷道冲击机理。结果表明:煤柱底板应力与煤柱所承受载荷有关,而采高是影响煤柱支承压力的主导因素,煤柱支承压力随采高的增大而增大,导致底板固定点的应力升高,对底板的影响范围和程度增加;构建煤柱效应下底板冲击理论模型,并对冲击过程进行分区,得出底板最大影响深度达到46.6 m,对2^(-2)煤层的开采有显著影响;数值计算工作面不同采高条件下煤柱支承压力变化及其对底板的效应,并验证了数值计算与理论计算是相吻合的;综合确定了巷道的合理位置与上层煤柱错动30m布置,得出巷道布置不仅与高、低应力区的分界线有关,还与主应力比值造成的围岩应力环境是否平衡有关。With the engineering geological conditions of coal seam 1-2 and 2-2 with large mining height mining as engineering and large deformation and failure of gateway 22306 of coal seam 2-2 under the remaining coal pillar as main clue, the impact mechanism of floor roadway under the disturbance of coal pillar in large mining height working face was analyzed through theoretical analysis and numerical calculation. The results have shown that the stress of coal pillar floor is related to the load of coal pillar,and the mining height is the dominant factor affecting the abutment pressure of coal pillar. The abutment pressure of coal pillar increases with the increase of mining height, which leads to the increases of stress at fixed point of floor, and the increases of influence range and degree of floor. The theoretical model of floor impact under coal pillar effect is constructed, and the impact process is divided into zones. The maximum influence depth of floor is 46.6 m, which has a significant impact on the mining of coal seam 2^(-2);the change of abutment pressure of coal pillar and its effect on floor under different mining heights are calculated numerically, and it is verified that the numerical calculation is consistent with theoretical calculation;the distance between the reasonable position of the roadway and the upper coal pillar are determined comprehensively to be 30 m. It is concluded that the roadway layout is related to not only the dividing line of high and low stress areas, but also the balance of surrounding rock stress environment caused by ratio of principal stress.

关 键 词：大采高 煤柱扰动 支承压力 分区破坏 巷道位置 主应力比值 

分 类 号：TD324[矿业工程—矿井建设]