三软煤层巷道布置优化与联合支护技术研究  

Roadway layout optimization and joint support technology in three soft coal seams

作　　者：王国龙 常云博 林陆 杜湃 李航 WANG Guo-long;CHANG Yun-bo;LIN Lu;DU Pai;LI Hang(Beijing Tiandi Huatai Mining Management Co.,Ltd.,Beijing 100013,China;China University of Mining and Technology(Beijing),School of Energy and Mining Engineering,Beijing 100083,China)

机构地区：[1]北京天地华泰矿业管理股份有限公司,北京100013 [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2期55-61,共7页Coal Engineering

摘　　要：为解决三软煤层回采巷道围岩大变形难支护和区段间留设大煤柱资源浪费的问题,对巷道布置和支护方式进行了优化,采用了厚煤层错层位外错式沿空掘巷相邻巷道联合支护的方法。首先采用极限平衡区法确定沿空巷道煤柱留设5m,建立了关键块B力学模型,计算分析了关键块B不会发生滑落失稳与回转失稳;其次介绍了相邻巷道联合支护技术;最后采用FLAC;数值模拟软件模拟比较了采用错层位沿空掘巷原支护方案和巷道支护方案优化后回采期间巷道围岩支护效果。结果表明:优化后支护方案顶板浅部围岩可稳定悬吊在深部稳定岩层中,控制巷道浅部围岩变形;侧帮锚索与巷道顶部锚索形成联合锚固区,增强了顶板抗离层能力,加强了顶板围岩不同方向节理裂隙的控制能力,可有效保证巷道围岩处于稳定状态。In order to solve the problems of large deformation and difficult support of surrounding rock of roadway in three soft coal seams and waste of resources of retaining large coal pillars between sections,the roadway layout and support mode are optimized. The method of adjacent roadway joint support is adopted in out-staggered gob-side entry driving in thick coal seam staggered arrangement. Firstly,the size of gob-side entry coal pillar is determined to be 5m using limit equilibrium zone method,and the mechanical model of key block B is established. According to the calculation,sliding and rotary instability will not occur to the key block B. Secondly,the joint support of adjacent roadways is introduced. Finally,FLAC;simulation is used to compare the surrounding rock support effect during roadway mining of the original support scheme and optimized scheme. The results show that the optimized support scheme can stably suspend the shallow surrounding rock of the roof in the deep stable rock stratum and control the deformation of the shallow surrounding rock of the roadway;the side wall anchor cable and the roadway top anchor cable form a joint-anchor zone,which enhances the anti-separation ability of the roof,strengthens the control ability of joint fissures in different directions of the roof surrounding rock,thus to ensure the stability of roadway surrounding rock.

关 键 词：三软煤层 巷道布置 错层位 沿空掘巷 联合支护 

分 类 号：TD822.2[矿业工程—煤矿开采]