浅埋薄基岩煤层护巷煤柱优化机理研究及方案确定  

Mechanism Study and Scheme Determination of Chain Pillar Optimization in Coal Seam with Shallow Buried Thin Bedrock

作　　者：张世青[1] 赵健健[1] 张春雷[1] 郁志伟[1] 魏春臣 

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

出　　处：《煤炭工程》2014年第6期4-6,共3页Coal Engineering

基　　金：国家重点基础研究发展计划(973计划)项目"西部煤炭高强度开采下地质灾害防治与环境保护基础研究"(2013CB227900)

摘　　要：针对浅埋深薄基岩中厚煤层护巷煤柱合理宽度的问题,结合李家壕煤矿2-2中煤层的实际情况,对其煤柱的可优化性、不同煤柱宽度的应力分布特征及塑性区分布范围进行研究,结果表明:浅埋深薄基岩中厚煤层中煤柱矿压较小,矿压显现不明显,煤柱宽度大于16m时,煤柱整体应力较低,塑性区范围较小,中间弹性核宽度过大;煤柱宽度小于8m时,两侧支承压力叠加,煤柱整体应力较大,塑性区几乎贯通整个煤柱,不能满足煤柱稳定的需求;12m煤柱为合理煤柱,整体应力相对不大且中间弹性核合适,一个工作面可多回收煤炭6.21万t。Aiming at the reasonable width determination of chain pillar in medium - thick coal seam in shallow buried thin bedrock, and combining the situation of 2 -2 medium -thick coal seam in Lijiahao coal mine, the optimization capability of coal pillar, the stress distribution characteristic of coal pillars with different widths and the distribution range of plastic zone were studied. The results show that, rock pressure of coal pillar is relatively low and weighting is not obvious in medium - thick seam with shallow buried thin bedrock, when the width of coal pillar is larger than 16m, the stress of the whole pillar is low, the range of plastic zone is small and the width of elastic kernel in the middle is too large, when the width of coal pillar is smaller than 8m, the abutment pressure at the two sides overlays and the stress of the whole pillar is relatively high, the range of plastic zone nearly covers the whole pillar, not meeting the demand for pillar stability, the reasonable width of coal pillar is 12m, the overall stress is relatively modest and the elastic kernel in the middle is suitable and 62100 tons of coal can be excavated for one working face.

关 键 词：浅埋深薄基岩 护巷煤柱宽度 FLAC^3D 应力分布 塑性区 

分 类 号：TD822.3[矿业工程—煤矿开采]