摘要
为探究深部开采中不同底板岩性条件下煤柱留设宽度对巷道底鼓影响机理,以赵庄煤业3104巷为工程背景,采用理论分析、数值模拟、现场试验的方法,研究了深部厚煤层中回采巷道煤柱宽度参数变化,对不同岩性底板的承载应力场分布、最大破坏深度、破坏形态的影响。结果表明:巷道底鼓量及煤柱宽度与底板强度系数呈力学负相关;留设12 m煤柱时,3种岩性底板均无法支承上覆岩层载荷;留设16 m和20 m煤柱时,泥岩底板条件下破坏层位向巷道右侧煤岩体更深处转移,细砂岩、砂质泥岩底板载荷功能良好,破坏层位分布在巷道左侧及支护体围岩表层;提出了3104巷支护改进方案,有效降低了巷道底鼓。
In order to explore the influence mechanism of the width of coal pillars on the bottom of the roadway under different floor lithology conditions in deep mining,taking the 3104 roadway of Zhaozhuang coal industry as the engineering background,the methods of theoretical analysis,numerical simulation and field test were adopted.The influence of the variation of the coal pillar width parameters in the mining roadway in the deep thick coal seam on the bearing stress field distribution,the maximum failure depth and the failure shape of the floor with different lithologies was studied.The results show that the tunnel bottom and the coal pillar width have a negative mechanical correlation with the strength coefficient of the floor;when the 12 m coal pillar is left,the three lithologic floorboards cannot support the load of the overlying rock;when the 16 m and 20 m coal pillars are left,the mudstone under the condition of the floor,the damage level is transferred to the deeper coal rock mass on the right side of the roadway,the fine sandstone and sandy mudstone floor have good load function,and the damage level is distributed on the left side of the roadway and the surface layer of the surrounding rock of the support body;proposed 3104 roadway support the improvement plan effectively reduces the tunnel floor heave.
作者
张虎
弓培林
史明将
田野
ZHANG Hu;GONG Peilin;SHI Mingjiang;TIAN Ye(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030000,China)
出处
《煤炭技术》
CAS
北大核心
2023年第5期46-50,共5页
Coal Technology
基金
山西省自然科学基金面上项目(201901D111049)。
关键词
深部开采
厚煤层
煤柱宽度
底鼓控制
deep mining
thick seam
coal pillar width
floor heave control
