倾斜厚煤层沿空掘巷窄煤柱留设尺寸及围岩控制技术研究  

Reasonable width of narrow coal pillars and control technology of surrounding rock of gob-side entry in inclined thick coal seam

作　　者：孟祥军 赵鹏翔 王绪友 林海飞 何永琛 宁廷洲 王红胜 MENG Xiangjun;ZHAO Pengxiang;WANG Xuyou;LIN Haifei;HE Yongchen;NING Tingzhou;WANG Hongsheng(Liuhuanggou Coal Mine,Yankuang Xinjiang Mining Co.,Ltd.,Changji 831100,China;College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]兖矿新疆矿业有限公司硫磺沟煤矿,新疆昌吉831100 [2]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《西安科技大学学报》2022年第3期413-422,共10页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(51974237)。

摘　　要：为解决倾斜厚煤层沿空掘巷窄煤柱留设合理宽度及围岩控制等难题,以新疆硫磺沟煤矿(4-5)06工作面沿空掘巷为原型,运用理论分析、数值模拟及现场监测相结合的研究方法,研究倾斜厚煤层相邻工作面回采期间围岩应力分布、变形特征及相应的控制技术。结果表明,窄煤柱应避开侧向支承压力集中区,合理的煤柱宽度应小于峰值应力所在位置,即距离采空区边缘10 m。回采期间,煤柱宽度小于4 m时,围岩整体变形相对较小,煤柱进入塑性破坏状态,但不存在稳定承载区域;煤柱大于5 m时,煤柱内存在“近零位移”区域,煤柱帮承载能力相对较强,综合考虑采空区积水、瓦斯、地质构造等影响,以及煤炭资源利用最大化,最终确定煤柱留设宽度为4~5 m。结合矿压监测结果,进一步优化试验工作面围岩支护方案,并提出在地质构造和淋水段加强支护,现场实测表明,该技术可有效控制倾斜厚煤层沿空掘巷非对称变形。To set a reasonable width of narrow coal pillars and control the surrounding rocks in the inclined thick coal seam driving along the gob,the gob-side entry driving in(4-5)06 face of Xinjiang Liuhuanggou Coal Mine in Xinjiang was taken as the research prototype.In this paper,the stress distribution and deformation characteristics are examined of surrounding rock during mining in adjacent working face of inclined coal seam and corresponding control technology,via theoretical analysis,numerical and field monitoring.The research results showed that the narrow coal pillar should avoid the lateral support pressure concentration area,and the reasonable coal pillar width should be less than the peak stress location,that is,10 m from the edge of the gob.During mining,when the width of the coal pillar was less than 4 m,the overall deformation of the surrounding rock was relatively small.And the coal pillar enters a plastic failure state,but there was no stable bearing area.When the coal pillar was larger than 5m,there was a“near-zero displacement”area in it,and the bearing capacity of the coal pillar was relatively strong.Considering the influence of water,gas and geological structure in the goaf and the utilization maximization of coal resources,the width of the coal pillar is determined to be 4~5 m.In light of the results of pressure monitoring,the surrounding rock support scheme of the test face can be optimized,and the support in the geological structure and the water spraying section are supposed to strengthen.Field measurements showed that the technology can effectively control the asymmetric deformation of the gob-side entry driving in inclined thick coal seam.

关 键 词：倾斜厚煤层 煤柱宽度 沿空掘巷 围岩控制 

分 类 号：TD712[矿业工程—矿井通风与安全]