对淮南巨厚松散层含水层下提高回采上限的探讨

Discussion on Improving Upper Extraction Limit under Super Thick Unconsolidated Stratum Aquifer in Huainan

为提高煤层回采上限,解放呆滞煤量和煤层安全开采,基于顾桥煤矿北二采区的地质工作,分析承压松散层含水层下覆岩破坏特征,查明工作面“两带”发育高度,最终确定:I类区块留设60~100 m安全煤岩柱,Ⅱ类区块留设20~40 m安全煤岩柱。按淮南煤田部分矿区常规防水煤岩柱80 m留设比较,Ⅱ类区块缩小40~60 m防水煤岩柱,初步估算解放呆滞煤量约1.80 Mt。

In order to improve the coal seam upper extraction limit,liberate the sluggish coal and safe mining of coal seams,based on the geological work of No.2 mining area in Guqiao Colliery,the paper analyzes the failure characteristics of the overlying strata under the confined loose aquifer and finds out the development height of the“two zones”of the working face.It also determines that 60~100 m safe coal and rock columns are reserved for the I-type blocks,and 20~40 m safe coal and rock columns are reserved for the II-type blocks.According to the 80 m of conventional waterproof coal-rock columns in some mining areas of Huainan coalfield,the II-type blocks are reduced by 40~60 m waterproof coal pillars,and the estimated liberation of stagnant coal is about 1.80 Mt.