突水系数计算公式适用条件的探讨

Discussion on Applicable Conditions of Calculation Formula of Water Inrush Coefficient

本文分别利用突水系数法、水头压力值法和隔水层阻水性能评价方法,对大佛寺煤矿三采区9+10号煤层带压开采进行安全评价,得出完全不同的两种结果。其中利用突水系数和水头压力值法评价,三采区属于带压开采安全区;而利用隔水层阻水性能法评价,则三采区属于带压开采危险区。由此认为突水系数法有一定的适用条件,当有效阻水带厚度承担不了该范围的承压性时,采用突水系数法进行奥灰水带压安全性评价将失去其有效性。

The paper makes a safety evaluation of mining under safe water pressure of aquifer in No.9 and 10 coal seam of No.3 mining area of Dafosi Colliery through water inrush coefficient method,water head pressure value method and water resistance property of aquiclude method,in which it is concluded that No.3 mining area belongs to safe zone by water inrush coefficient and water head pressure value evaluation while dangerous zone by water resistance property of aquiclude evaluation,determining water inrush coefficient method has certain applicable conditions,but loses its effectiveness in Ordovician limestone water safety evaluation when the effective thickness of water resistance can't bear the pressure within the range.