小回沟煤矿9#煤底板带压开采突水危险性评价

Risk assessment of water inrush in 9#coal floor under pressure mining in Xiaohuigou Coal Mine

小回沟煤矿9#煤层井田内奥陶系岩溶水水位高于煤层底板标高,底板隔水层变薄处、较大断层和陷落柱等构造地段存在潜在突水威胁,为了保障煤矿的安全开采,分别采用突水系数法和脆弱性指数法对其进行了突水危险性评价以及安全区域的划分,前者得出井田多数区域为安全区,在东北部断层、陷落柱范围内存在突水威胁性,后者得出9#煤层底板突水危险区主要分布于井田西部,较危险区主要分布于井田中西及南部,井田中部向东北部首采区过渡依次划分为过渡区、较安全区、安全区。

The Ordovician karst water level in the 9#coal seam minefield of Xiaohuigou Coal Mine is higher than the seam floor level.There are potential water inrush threats in the structural sections such as the thinner water barriers,large faults and subsidence columns.The water inrush risk assessment and the division of safety areas were carried out using the water inrush coefficient method and the vulnerability index method.The former concluded that most areas of the minefield were safe areas,and there were water inrush threats in the faults and subsi-dence columns in the northeast.The latter shows that the water inrush danger zone of the 9#coal seam floor is mainly distributed in the west of the minefield,and the more dangerous zone is mainly distributed in the west and south of the minefield.The transition from the middle of the minefield to the first mining area in the northeast is divided into transition zone,safer zone,Safe place.