分层开采底板岩体渗透性变化的试验研究

Experimental investigation of floor rock permeability through injecting water in the slicing process

华北煤田石炭二叠纪煤系地层底部存在着含水丰富的奥陶纪石灰岩 .开采实践表明 ,一旦煤层与奥灰之间的隔水层内存在地质构造或煤层开采引起底板岩体破坏 ,可能会在煤层和含水层之间形成导水带 ,从而诱发突水 .介绍了分层开采对底板岩石渗透性影响的试验成果 ,并进行了详尽的分析 ,获得了分层开采对煤层底板岩体渗透性的影响规律 .

Beneath Permo carboniferous coal strata in North China coalfields, there are Ordovician limestones containing plentiful confined water. It has been shown that if there are structures or strata failures induced by mining within aquiclude between coal strata and Ordovician limestone, water flowing zones may be formed and Ordovician water might be flooded into working faces. Therefore, it is necessary to make a closely study of the influence of mining on floor rocks, especially changes of floor permeability in the slicing process. In the paper, a new experimental method of studying permeability of floor rocks is introduced, a great deal of data are obtained and analyzed in detail. Then, the new characteristics of influence of mining on floor in the slicing process are presented.