围岩加强支护留窄煤柱护巷的可行性研究  

Feasibility Study on Strengthening Support of Narrow Coal Pillar in Surrounding Rock

作　　者：王浩[1,2] 庞杰文[1,2] 杨少强 WANG Hao;PANG Jiewen;YANG Shaoqiang(School of Safety and Emergency Management Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Intelligent Monitoring and Control of Coal Mine Dust Key Laboratory of Shanxi Province,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学安全与应急管理工程学院,太原030024 [2]太原科技大学煤矿粉尘智能监测与防控山西省重点实验室,太原030024

出　　处：《煤炭技术》2024年第2期81-85,共5页Coal Technology

基　　金：山西省基础研究计划青年科学研究项目(202203021212311)。

摘　　要：为了减少煤矿井下资源浪费现象的发生,研究了留设不同宽度保护煤柱时,围岩塑性区及垂直应力在施工“支护-卸压-砌墙”协同控制技术前后的数值模拟对比分析。数值模拟结果表明:未采取围岩加强支护措施时,随着停采线与回风大巷之间距离的减小,煤柱垂直应力峰值呈先增大后减小的趋势,且回风大巷围岩破坏变形严重;施工“支护-卸压-砌墙”协同控制技术后,随着保护煤柱的回采,煤柱与回风大巷围岩的塑性形变区域面积占比都显著减小,且回风大巷的垂直应力峰值平均减小了25.32%,应力集中系数平均减小了27.03%;在保证煤柱及大巷围岩稳定的前提下,可适当的缩减保护煤柱的宽度,以减少煤炭资源的浪费,并可为煤矿带来较大的经济效益。In order to reduce the waste of resources in underground coal mines,the numerical simulation and comparative analysis of the plastic zone and vertical stress of surrounding rock before and after the construction of"support-pressure relief-wall masonry"collaborative control technology were carried out when different width protective coal pillars were left.The numerical simulation results show that when the surrounding rock strengthening support measures are not taken,with the decrease of the distance between the stop line and the return airway,the vertical stress peak of the coal pillar increases first and then decreases,and the surrounding rock of the return airway is seriously damaged and deformed.After the construction of"support-pressure relief-wall masonry"collaborative control technology,with the mining of protective coal pillars,the proportion of plastic deformation area of coal pillars and surrounding rock of return air roadway decreases significantly,and the vertical stress peak of return air roadway decreases by 25.32%on average,and the stress concentration coefficient decreases by 27.03%on average;under the premise of ensuring the stability of coal pillar and roadway surrounding rock,the width of protective coal pillar can be appropriately reduced to reduce the waste of coal resources and bring greater economic benefits for coal mine.

关 键 词：窄煤柱 塑性区 垂直应力 加强支护 

分 类 号：TD322[矿业工程—矿井建设] TD823