沿空掘巷窄煤柱宽度确定  

Determination of the narrow pillar width of gob-side entry driving

作　　者：张科学[1] 张永杰[2] 马振乾[1] 毕文广 杨英明[1] 李杨[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083 [2]北京天地华泰采矿工程技术有限公司,北京100013

出　　处：《采矿与安全工程学报》2015年第3期446-452,共7页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展规划(973)项目(2010CB226801;2010CB226804);国家自然科学基金项目(51174213);新世纪优秀人才项目(NCET-10-0775);中央高校基本科研业务专项资金项目(2009QM001)

摘　　要：沿空掘巷是我国煤矿回采巷道布置和维护的一种技术。本文针对具体生产地质条件，运用极限平衡理论、数值分析和现场工业性试验相结合的方法，通过应力场分析，得出：煤宽为3～5m时，垂直应力分布近似呈钝角三角形；煤宽为5～8m时，垂直应力分布近似呈锐角三角形；煤宽为8～10 m时，垂直应力分布近似呈梯形。通过位移场分析，得出煤柱向巷道内位移普遍大于向采空区侧位移，且随着煤柱宽度增大向巷道内位移增大，向采空区侧位移相对影响较小。最后得出沿空掘巷窄煤柱宽度的确定方法，即从上区段采空区侧向支承应力分布规律和应力场分布、位移场分布、巷道围岩变形与煤柱宽度的关系及窄煤柱宽度的极限平衡理论计算5个方面综合考虑窄煤柱的宽度，最终确定窄煤柱宽度为5m。现场工业性试验表明，沿空掘巷巷道变形大、破坏严重的现状得以改善。Gob-side entry driving in large pillar is a technology of roadway layout and maintenance. This paper, according to the specific geological conditions, based on the limit equilibrium theory, nu-merical calculation and the combination of industrial field tests, and through the stress field analysis, has concluded that if the coal width is of 3-5 m, the vertical stress distribution approximation shows ob-tuse angle triangle, the coal width of 5-8 m, the vertical stress distribution approximation shows acute angle triangle, the coal width of 8-10 m, the vertical stress distribution approximation shows trapezoidal. According to the analysis of the displacement field, pillar displacement of the roadway is generally greater than that of gob side, and as the pillar width increases to the roadway displacement, lateral dis-placement to the gob-side is relatively less affected. Finally certain method to determine the width of gob-side entry driving has been found, which needs workers to take five aspects into consideration in-cluding distribution of stress of the section of the lateral support goaf, stress field distribution, dis-placement field distribution, the relationship between deformation of surrounding rock and pillar width and limit equilibrium theory of narrow pillar width, and then that the narrow pillar width is five meter has been finalized. Industrial field tests have shown that the status quo of large deformation and severe damage of the roadway in the gob-side entry driving has been improved.

关 键 词：沿空掘巷 窄煤柱 巷道 煤柱宽度 应力场 位移场 

分 类 号：TD353[矿业工程—矿井建设]