同忻煤矿窄煤柱宽度留设及围岩控制实践  

Narrow coal pillar width reserve and surrounding rock control in Tongxin Coal Mine

作　　者：贺雄 冯剑 徐青云[1] 李硕森 孙浩杰 赵晓渝 HE Xiong;FENG Jian;XU Qingyun;LI Shuosen;SUN Haojie;ZHAO Xiaoyu(Coal Engineering College,Shanxi Datong University,Datong 037001,China)

机构地区：[1]山西大同大学煤炭工程学院,山西大同037001

出　　处：《陕西煤炭》2024年第4期12-17,共6页Shaanxi Coal

摘　　要：针对特厚煤层综放开采沿空掘巷时,留设宽煤柱护巷造成煤炭资源丢失严重,以及围岩变形量大、煤壁片帮等问题,以同忻煤矿8311工作面5311回风巷为工程背景,采用理论分析、数值模拟和现场观测相结合的方法,对其沿空掘巷护巷煤柱合理宽度的留设进行了分析。研究表明,理论分析得知留设煤柱宽度为6 m左右时可确保5311回风巷位于沿空边缘煤体支承压力降低区和煤体应力屈服区,有利于巷道围岩的稳定。基于3DEC数值模拟分析,得到留设6 m煤柱5311回风巷的稳定性以及8311工作面回采后沿空掘巷超前段顶板、实体煤帮、煤柱内围岩应力分布和塑性区演化特征。经现场应用,验证了综放开采留设窄煤柱掘巷技术的优越性和可靠性。In response to the serious loss of coal resources,as well as problems such as large deformation of surrounding rock and coal wall fragmentation caused by the reserve of wide coal pillars to protect the goaf during fully mechanized top coal caving in extremely thick coal seams,taking the 5311 air return roadway of the 8311 working face in Tongxin Coal Mine as the engineering background,a study was conducted on the selection of the reasonable width of the coal pillar for protecting the roadway along the goaf by combining theoretical analysis,numerical simulation,and on-site observation.Research has shown that theoretical analysis indicates that when the width of the reserved coal pillar is about 6 meters,it can ensure that the 5311 air return roadway is located in the area where the support pressure of the coal body decreases and the stress yield area of the coal body along the goaf edge,which is conducive to the stability of the surrounding rock of the roadway.Based on 3DEC numerical simulation verification,the stability of the 5311 air return roadway with a 6 m coal pillar and the evolution characteristics of the stress distribution and plastic zone in the overlying roof,solid coal slope,and surrounding rock inside the coal pillar of the 8311 working face after mining along the goaf are studied.The on-site application results also prove the superiority and reliability of the narrow coal pillar excavation technology in fully mechanized top coal caving mining.

关 键 词：特厚煤层 沿空掘巷 煤柱宽度 围岩控制 顶板破断特征 

分 类 号：TD353[矿业工程—矿井建设] TD822