中文摘要：

疏水降压是降低煤层底板厚层灰岩含水层水害威胁的最常用方法之一。针对平煤股份八矿二1煤底板寒武灰岩水压高、地下水温度高且富水性分布不均一的特点，根据地质构造、隔水层、含水层、水动力场、水温度场、水化学温标、瞬变电磁和直流电法勘探等综合探查信息，分析了寒武灰岩含水层地热水的埋藏和分布规律，并划定了富水异常区；结合计算的含水层疏水降压影响半径，在西大巷底板布置了7眼寒武灰岩地热水疏水降压孔，7眼疏水孔总涌水量300 m3/h，277 d内，西大巷寒武灰岩水位共下降17.2 m，西大巷内空气温度降低2℃；涌出的50℃地热水提至地表可供综合利用。

英文摘要：

Depressurization by dewatering is one of the most commen methods to mitigate water hazard from aquifers un-der seam floor. For the characteristics of Cambrian limestone water high-pressure, groundwater high-temperature and water-rich heterogeneous distributions in 2-1 coal floor of Pingmei No.8 Mine, based on complex detective information from geological structure, confining bed, aquifer, hydro-dynamic field, hydro-temperature field, hydro-chemical tem-perature scale, transient electromagnetic method and DC electrical method, distribution law and geothermal water depth of Cambrian limestone aquifer are discussed and anomaly areas with rich water are delimited. Combined calcu-lated-radius of influence in drainage and decreasing pressure of aquifer, 7 wells with depth of 150 m in this aquifer are arranged in coal floor of west main roadway, the total water yield of these drainage wells amount to 300 m3/h,and the measure causes that water level of Cambrian limestone are lowered by 17.2 m during 277 days, and that atmosphere temperature also dropped 2℃in west main roadway. 50℃geothermal water can be used comprehensively after lifting to surface.