磁西一号超千米深井煤层开采底板突水危险性评价

磁西一号井田煤层埋藏较深，其开采主要受深部奥灰承压水的威胁，为了成功开采以解放深部呆滞煤炭资源，保障矿区可持续发展，对磁西一号矿2#煤层开采奥灰突水危险性进行了评价。文章以峰峰矿区东部和磁西一号矿水文地质条件为基础，对矿井充水因素、含水层之间水力联系、采动裂隙带有效隔水层厚度、底板抗压强度及隔水能力等进行分析研究， 主要采用突水系数法对煤层底板突水危险性进行了评价，通过计算得出：带压开采2#煤层突水系数平均为0.056MPa/m，位于过渡区，突水系数具备带压开采的基本条件。由于井田内煤层埋藏深度较大的区域控制程度较低，地质、水文地质条件不清楚，开采前需要进行补充勘探，经充分论证后，方可进行试采。

Magnetic west 1 km deep well mining of coal seam floor water bursting risk assessment

The coal-beds are buried deeply in the Cixi 1# mine; and the mining is mainly menaced by confined water within ordovician limestone. In order to exploit the deep coal resources successfully and ensure sustainable development of mining area, the ordovician limestone water inrush danger is evaluated for 2# coal seam. On the basis of hydrogeology condition in the east of Fengfeng mining area and Cixi 1# mine, the mine water filling factor, hydraulic connection between aquifers, effective confining bed thickness of mining fissure zone, floor compressive strength and water-insulating capability are studied, the water inrush danger is evaluated with water bursting coefficient method. The calculations show that the average water bursting coefficient located in the transition zone is 0.056MPa/m in mining under pressure, and it conforms to the conditions of under pressure mining basically. However the coal-beds are buried deeply and regional control level is low, geological and hydro-geological conditions are not clear, supplement exploration must be carried out before mining.