中厚煤层窄煤柱沿空掘巷围岩稳定性研究  

Surrounding rock stability during gob-side entry driving with narrow coal pillar in medium-thick coal seam

作　　者：殷帅峰[1] 左安家 马丽洁 任宇新 石松豪 YIN Shuai-feng;ZUO An-jia;MA Li-jie;REN Yu-xin;SHI Song-hao(Safety Engineering Center,North China University of Science and Technology,Beijing 101601,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]华北科技学院安全工程学院,北京101601 [2]中国矿业大学(北京)能源与矿业学院,北京100083

出　　处：《煤炭工程》2022年第5期90-96,共7页Coal Engineering

基　　金：河北省自然科学基金面上项目(E2021508011);河北省高等学校科学技术研究“青年拔尖人才”计划项目(BJ2020208)。

摘　　要：以恒源煤矿487工作面窄煤柱沿空掘巷为工程背景,基于该矿工程实况采用理论计算、数值模拟等手段综合确定487工作面回风巷最优护巷煤柱宽度为5m;基于数值模拟分析了487工作面回采后沿空掘巷超前段顶板、实体煤以及煤柱内围岩应力分布、围岩变形与塑形区演化特征,针对性提出了高强锚杆索组合非对称支护技术,并分析了巷道支护应力场的合理性。工程实践表明:工作面回采动压影响下沿空掘巷围岩剧烈扰动范围存在于超前工作面30m内,顶底板及两帮移近量最大分别为574mm、759mm;超前工作面30m后巷道围岩变形趋于稳定,顶底板及两帮移近量平均分别为190mm、315mm,5m护巷煤柱和高强锚杆索组合非对称支护技术有效控制了沿空掘巷围岩变形。Based on the engineering background of gob-side entry driving with narrow coal pillar in 487 working face of Hengyuan Coal Mine,the optimal roadway pillar width of tailgate in 487 working face is determined to be 5 m by means of theoretical calculation and numerical simulation.Based on numerical simulation,the stress distribution,surrounding rock deformation and plastic zone evolution characteristics of roof,solid coal and coal pillar in advance roadway after mining in 487 working face are analyzed.The combined asymmetrical support technology with high-strength bolt and cable is proposed,and the rationality of roadway support stress field is analyzed.The engineering practice shows that,under the influence of mining dynamic pressure the surrounding rock of gob side entry is disturbed severely by the working face within 30 m of the advance working face.The maximum displacement of roof and floor and side walls are 574 mm and 759 mm,respectively.The of deformation surrounding rock tends to be stable after 30 m ahead of working face,the average roof-to-floor convergence and side-wall convergence are 190 mm and 315 mm separately,which means the 5 m coal pillar and bolt-cable combined asymmetric support technology can control the surrounding rock deformation in gob-side entry driving.

关 键 词：沿空掘巷 煤柱尺寸 回采动压 围岩控制 非对称支护 

分 类 号：TD353[矿业工程—矿井建设]