突水系数法在大淑村煤矿西翼6号煤安全开采中的应用

Application of Water Bursting Coefficient Method on Coal No.6 Safe Working in West Limb of Dashucun Coalmine, Fengfeng Mining Area

大淑村矿从勘探到生产阶段，对奥陶系石灰岩含水层的专门水文地质勘探程度较低，其含水层富水性及其变化规律，地下水补给、径流条件及水文地质单元划分尚未完全明确，对矿井后续生产拟开采的6号煤层，开采中受到水压高达4～10MPa的下伏巨厚奥陶系石灰岩岩溶裂隙承压水的潜在威胁，底板水害影响程度无法进行较为准确的评价。通过西翼奥灰放水试验，利用获得的主要水文地质参数，计算出6号煤层底板突水系数。经用突水系数法预算，开采西翼6号煤层时，奥陶系中统峰峰组石灰岩含水层水头高度需下降192.17m，其预计涌水量为924.43m^3/h，才能满足煤层底板突水系数小于0.06MPa/m的要求，开采6号煤层才是安全的。

The special hydrogeological exploration degree for Ordovician limestone aquifer was rather low in the Dashucun coalmine from exploration stage to production stage. The aquifer water yield property and its variation pattern, groundwater recharge and runoff conditions, as well as hydrogeological elements were still not clear. For coalmine follow-on production preparative mining of coal No. 6, has threatened by potential underlying very thick Ordovician limestone karst fissure confined water 4~10MPa pressure, floor water haz？ard extent is unable to carry out rather correct assessment. Through west limb Ordovician limestone aquifer outflow test, using obtained main hydrogeological parameters, worked out coal No.6 floor water bursting coefficient. Estimation through water bursting coefficient method, during the west limb coal No.6 extracting, height of water head of middle Ordovician Fengfeng Formation limestone aquifer need to be 192.17m lowered, expected water inflow 924.43m^3/h can only satisfy the requirement of water bursting coefficient of coal floor less than 0.06 MPa/m, the extracting of Coal No.6 is only secure.