窄煤柱沿空掘巷围岩稳定协同控制技术研究与应用  

Research and application of coordinated control technology for surrounding rock stability of gob-side entry driving with narrow coal pillar

作　　者：陈志维 张彦董 CHEN Zhiwei;ZHANG Yandong(CHN Ningxia Coal Industry Group,Yinchuan 750002,China;School of Mines,China University of Mining&Technology,Xuzhou 221116,China)

机构地区：[1]国家能源集团宁夏煤业集团,宁夏银川750002 [2]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《矿业安全与环保》2023年第1期65-70,共6页Mining Safety & Environmental Protection

基　　金：中央高校基本科研业务费专项资金项目(2021QN1097)。

摘　　要：为提升矿井采掘接续能力、实现煤炭资源的精采细采,改变以往留设大煤柱导致回采率低的现状,以石槽村煤矿211203工作面回风巷为工程背景,在研究综采工作面采动矿压显现规律基础上,对比分析了巷道3种布置方式的优缺点,提出上覆岩层协同控制系统,分析窄煤柱沿空巷道围岩结构体系各组成元素对上覆岩层的协同控制作用,给出了沿空掘巷围岩控制方法,具体优化方法为:(1)确定窄煤柱合理留设宽度使新掘巷道处于最佳应力环境以确保煤柱稳定性;(2)应用钻孔卸压技术、“三高”锚杆(索)支护技术增强巷道围岩自身承载能力。结合现有支护经验和具体地质条件,设计了211203综采工作面回采巷道围岩变形控制具体支护方案,重点控制煤柱三角区域、肩窝、底角等薄弱部位的稳定。应用表明现场支护效果较好,能满足巷道使用要求。In order to improve the mining connection capacity of the mine and realize the fine mining of coal resources, and change the current situation of low recovery rate caused by large coal pillars, taking the return airway in 211203 working face of Shicaocun Coal Mine as the engineering background, the advantages and disadvantages of three roadway layout modes were compared and analyzed on the basis of studying the mining pressure developing law of fully mechanized mining face. The collaborative control system of overlying strata was proposed, the collaborative control effect of the constituent elements of the surrounding rock structure system of gob-side entry with narrow coal pillar on overlying strata was analyzed, and the surrounding rock control method of gob-side entry driving was given. The specific optimization methods are as follows:(1) to determine the reasonable reserved width of the narrow coal pillar to make the newly excavated roadway in the best stress environment, so as to ensure the stability of the coal pillar;(2) drilling pressure relief technology and “three high” anchor rockbolt(anchor cable) support technology are applied to enhance the bearing capacity of roadway surrounding rock. Combined with the existing support experience and specific geological conditions, a specific support scheme for surrounding rock deformation control of mining roadway in 211203 fully mechanized mining face is designed, focusing on the stability of weak parts such as coal pillar triangle area, shoulder socket and bottom corner. The application shows that the effect of on-site support is good and can meet the requirements of roadway use.

关 键 词：窄煤柱 沿空掘巷 支护设计 钻孔卸压技术 锚杆支护 上覆岩层 围岩变形 

分 类 号：TD353[矿业工程—矿井建设]