上保护层开采卸压时空效应及被保护层抽采钻孔优化研究  

Study on Pressure-relief Time-space Effect in Extraction of Upper Protective Seam and Optimization of Drainage Boreholes in Protected Seam

作　　者：孟贤正[1,2] 李成成[1,2] 张永将[1,2] 程国建[1,2] 

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院,重庆400037

出　　处：《矿业安全与环保》2013年第1期26-31,共6页Mining Safety & Environmental Protection

基　　金：中煤科工集团重庆研究院青年创新基金项目(2011QNJJ013)

摘　　要：采用理论、数值模拟综合方法,研究了中远距离上保护层开采底板应力场演化、分布规律,发现上保护层长壁式开采采空区底部煤岩层倾斜方向呈凹形、走向平面呈"O"形的卸压球壳,卸压角在其切眼或终采线附近隅角处最小,底部被保护范围煤层的中部卸压效果比两侧的卸压效果佳,即被保护范围煤层倾斜中部的抽采半径比两侧的抽采半径要大;在走向上被保护层卸压滞后保护层采煤工作面一定距离,可以此研究成果指导被保护层钻孔瓦斯抽采工作。Study was carried out on the evolution and distribution regularity of floor stress field in the extraction of the medium- or large-interval upper protection seam by using theoretical and the numerical simulation method, it was found that the gob floor rock strata of the upper protective seam by long- wall mining assumed a concave pressure- relief shell in dip direction and an ＂0＂ - shaped pressure-relief shell on strike plane, the pressure-relief angle was the minimum at the corner angle near its starting cut or terminal line, the pressure-relief effect in the middle of the bottom protected seam was better than that on its two sides, i.e. the drainage radius in the middle of the protected seam was larger than that on its two sides ; the pressure-relief zone of the protected seam in strike lagged a certain distance behind the working face of the protective seam, so this theoretical result can be used to guide the gas drainage from protective seam by boreholes.

关 键 词：上保护层 时空效应 瓦斯抽采 钻孔优化 

分 类 号：TD713[矿业工程—矿井通风与安全]