摘要
工作面超前支承压力不仅受采高影响,与覆岩关键层位置也密切相关。通过理论分析和UDEC2D数值模拟的方法研究了采高和关键层与煤层的距离对超前支承压力的影响规律。结果表明:在关键层厚度保持不变的前提下,关键层与煤层的距离一定时,采高越大,工作面超前支承压力峰值越小,峰值位置距离煤壁越远;采高一定时,关键层与煤层的距离越近,工作面支承压力峰值越大。当关键层与煤层距离大于一定值后,关键层对工作面支承压力峰值基本无影响。该结论对于超前段巷道的支护以及瓦斯抽采钻孔的优化布置具有一定的指导意义。
Abutment pressure is not only influenced by mining height,but also close related to key strata position. UDEC2 Dnumerical simulation method is applied to study the law of influence that both mining height and the distance between the key seam and coal seam on abutment pressure. The result shows that: on the premise that the key stratum thickness is invariable and distance between the key seam and coal seam is fixed, the higher the mining height is, the lower peak value of abutment pressure is,and the further distance between the abutment peak value position and coal wall. If the mining height is fixed, the closer distance between the key seam and coal seam, the higher peak value of abutment pressure is. If the distance between the key seam and coal seam is beyond a certain range,the key seam almost produces no effect on the peak value of abutment pressur. The key seam almost produces noeffect on the peak value of abutment pressur. The conclusion has drawn certain directive significance on conducting advanced support, gas drainage hole and the optimal placementt.
出处
《煤炭技术》
CAS
北大核心
2015年第3期34-36,共3页
Coal Technology
基金
国家"十二五"科技支撑计划资助项目(2012BAK04B06)
江苏高校优势学科建设工程资助项目PAPD(SZBF2011-6-B35)
关键词
支承压力
关键层
采高
关键层位置
abutment pressure
key stratum
mining height
key stratum position
