特厚煤层沿空煤巷窄煤柱留设与非对称支护技术研究  

Research on narrow pillar setting and asymmetric support technology of gob side entry in extra thick coal seam

作　　者：刘宜平 殷帅峰[2] 杨敬峰 左安家 LIU Yiping;YIN Shuaifeng;YANG Jingfeng;ZUO Anjia(Shanxi Lanxian Changheng Coke Co.,Ltd.,Lanxian,033500,China;School of Safety Engineering,North China Institute of Science and Technology,Yanjiao,065201,China)

机构地区：[1]山西岚县昌恒煤焦有限责任公司,山西岚县033500 [2]华北科技学院,北京东燕郊065201

出　　处：《华北科技学院学报》2020年第5期7-12,共6页Journal of North China Institute of Science and Technology

基　　金：河北省高等学校科学技术研究青年人才“拔尖”项目(BJ2020208);中央高校基本科研业务费资助项目(3142018035)。

摘　　要：保证相邻采空区特厚煤层护巷窄煤柱小结构的稳定是实现沿空煤巷围岩整体稳定的关键,留设合理与否对工作面安全回采意义重大。本文以昌恒煤矿9102工作面为工程背景,基于极限平衡原理分析了煤柱塑性区和弹性核区范围,推导出煤柱理论宽度。现场采用钻孔应力监测得到煤柱内部支承压力分布规律,综合现场施工规范,优化沿空煤巷煤柱宽度为7.5m。用钻孔窥视法分析了顶板变形破坏特征,提出了锚索桁架走向非对称控制技术,并进行现场围岩变形观测。结果表明:顶板、煤柱帮和实体煤帮位移量在工作面回采期间巷道位移变形量和离层量均较小,且均在可控范围内,控制效果较好。The stability of narrow coal pillar and small structure adjacent to goaf is the key to achieve the overall stability of the surrounding rock of gob-side entry,and whether it is reasonable or not is of great significance to the safe mining in the working face.Taking 9102 working face in Changheng Coal Mine as the engineering background,this paper analyzes the plastic zone and elastic core zone of the coal pillar based on the principle of limit equilibrium,derives the theoretical width of coal pillar,obtains the distribution law of internal supporting pressure of coal pillar by drilling stress monitoring in the field,optimizes the width of coal pillar in gob-side entry by combining the site construction specifications to be 7.5m.The roof deformation and failure characteristics are analyzed by drilling peeping method.The asymmetric control technology of anchor cable truss strike is put forward,and the deformation of surrounding rock is observed on site.The results show that the displacement of roof,coal pillar sill and solid coal sill are small during the mining of working face,and the displacement and deformation of roadway are all within the controllable range,and the roadway control effect is good.

关 键 词：沿空煤巷 煤柱 钻孔窥视法 非对称支护 

分 类 号：TD353[矿业工程—矿井建设]