摘要
为研究在高应力软岩条件下窄煤柱留设问题,以曙光矿2~#煤层开采为工程背景,采用理论分析与数值模拟相结合的方法,得出错层位外错式沿空掘巷窄煤柱的确定方法,即从上区段采空区侧向支承应力分布规律、护巷煤柱宽度的理论计算、煤柱垂直应力和煤柱塑性区分布4个方面综合考虑护巷煤柱的宽度。理论计算得出破裂区为3.35 m,塑性区为5.76 m,利用数值模拟得出煤柱合理留设宽度为3.37~5.13 m。通过对不同煤柱宽度下巷道围岩应力分布进行数值分析,结果表明:当煤柱宽度为4 m时,巷道围岩变形小。
To study the problem of leaving a narrow coal pillar under the conditions of high soft rock,the mining of 2#coal seam in Shuguang Mine is taken as the engineering background.Using the methods of theoretical analysis,numerical calculation,we obtained a certain method of reasonable width of narrow coal pillars along an empty roadway with external-misaligned stagger arrangement,which considers four aspects for the pillar width from distribution laws of lateral support stress in upper goaf,the theoretical calculation of coal pillar width in retaining roadway,vertical stress and plastic zone distribution of coal pillar.Theoretical calculations show that the fracture zone is 3.35 m and the plastic zone is 5.76 m and the numerical simulation shows that the reasonable retention width of the coal pillar is 3.37 to 5.13 m.The numerical analysis of the surrounding rock stress distribution of the roadway under different coal pillar widths shows that when the coal pillar width is 4 m,the surrounding rock deformation of the roadway is small.
作者
王志强
仲启尧
王鹏
WANG Zhiqiang;ZHONG Qiyao;WANG Peng(School of Energy and Mining Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources,China University of Mining and Technology(Beijing),Beijing 100083,China;National Experimental Teaching Demonstration Center for Safe Coal Mining and Geological Guarantee,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《煤矿安全》
CAS
北大核心
2020年第1期216-221,228,共7页
Safety in Coal Mines
基金
国家自然科学基金青年科学基金资助项目(51404270)
国家自然科学基金面上资助项目(51774289)
中央高校基本科研业务费专项基金资助项目(2011QZ06)
关键词
高应力软岩
错层位
外错式
煤柱宽度
数值模拟
high stress soft rock
stagger arrangement
external-misaligned
coal pillar width
numerical simulation
