园子沟煤矿隶属黄陇侏罗系煤田永陇矿区，地处鄂尔多斯盆地中南部，主要水害类型为离层突水。采用钻孔冲洗液漏失量和钻孔电视观测方法，通过设计采前和采后对比钻孔，确定了2号煤层综放开采工作面裂采比；为了确保1012102工作面的安全回采，根据采动覆岩破坏实测成果和岩层地质结构特征，基于关键层理论和薄板理论，评价离层发育层位、离层突水及溃泥溃砂的危险性；针对该类离层突水具有滞后性、周期性且伴随溃砂、顶板来压等次生灾害的特点，提出了基于地面直通式泄水孔和井下疏放水孔联合的离层水治理技术。研究结果表明：该地质和采矿条件下裂采比为23.68，在洛河组、宜君组及安定组均具备形成离层的条件，且离层空腔体积大，矿井主要受顶板离层水害的威胁，一旦发生突水将会携带泥沙；通过以地面泄水孔为主，井下泄水孔为辅，结合地面泄水孔风流、水位数据观测及回采过程中地面电法补充探测，实现了对覆岩离层水进行全方位监测，形成了离层水的预控技术体系，保证了矿井的安全回采。

Yuanzigou Coal Mine belongs to Yonglong Mining Area of Huanglong Jurassic Coalfield, which is located in the south-central part of the Ordos Basin, and the main water hazard type is bed-separation water inrush. Using the borehole flushing fluid leakage and borehole television observation methods, the cracking and production ratio of the No.2 coal seam fully mechanized mining face was determined by designing the pre-mining and post-mining comparison boreholes. In order to ensure the safe mining of the 1012102 working face, according to the measured results of mining overburden failure and the characteristics of the geological structure of the rock layer, based on the key layer theory and the thin plate theory, the bed-separation development position, the risk of the water inrush and the mud and sand collapse of the bed-separation were evaluated. In view of the characteristics of this kind of bed-separation water inrush with hysteresis, periodicity, accompanied by secondary disasters such as sand collapse and roof pressure, a layered water treatment technology based on the combination of surface through-type drainage hole and underground dredging hole well was proposed. The research results show that the crack-to-mining ratio is 23.68 under the geological and mining conditions, and the conditions for the formation of bed-separation in Luohe Formation, Yijun Formation and Anding Formation are all available, and the volume of the separation cavity is large, and the mine is mainly threatened by the roof separation water hazard, and the sediment will be carried once the water inrush occurs. The change of water level data and the supplementary detection of ground electric method in the mining process realize the all-round monitoring of the overlying rock separated layer water, form a pre-control technology system for the separated layer water, and ensure the safe mining of the mine.