摘要
针对近距离煤层不规则遗留煤柱下回采巷道稳定性差、支护困难等问题,以内蒙古某矿20314辅运巷为工程背景进行研究。根据近距离煤层实际开采条件,采用FLAC^(3D)软件模拟研究了上下煤层工作面回采后不规则煤柱下巷道垂直应力变化规律。研究表明:近距离上下煤层工作面回采后,在采空区之间遗留形成的三角型边角岩层区域出现垂直应力集中现象;遗留煤柱下的巷道受到本煤层工作面侧向支承压力与上部残留煤柱支承压力的双重影响,垂直应力大于巷道两帮煤体抗压峰值强度,则巷道出现破坏。
In view of the problems of poor integrity and support difficulties in mining roadway under the upper stratified irregular coal pillar, taking 20314 auxiliary roadway of a coal mine in Inner Mongolia as engineering background. According to the actual mining conditions of the coal seam, FLAC^3D software was used to simulate and study the change rule of vertical stress of roadway under irregular coal pillar after mining in upper and lower coal seam working face. The results show that the vertical stress concentration occurs in the area of triangular rock stratum left between the goafs after mining the upper and lower coal seams. The roadway under the remaining coal pillar is affected by both the lateral supporting pressure and the upper residual pillar supporting pressure. When the vertical stress is greater than the peak compressive strength of the coal body in the roadway, the roadway is damaged.
作者
商和福
宁建国
杨尚
姜宁
邱鹏奇
徐强
SHANG Hefu;NING Jianguo;YANG Shang;JIANG Ning;QIU Pengqi;XU Qiang(State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and the Ministry of Scienceand Technology, Shandong University of Science and Technology, Qingdao 266590, China)
出处
《煤矿安全》
CAS
北大核心
2019年第5期273-276,280,共5页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51574154)
关键词
不规则遗留煤柱
近距离煤层
支承压力
数值模拟
垂直应力
irregular coal pillar
close distance coal seams
supporting prossure
numerical simulation
vertical stress
