因此，对煤层顶底板的变形破坏规律、构造特征以及断层各要素的研究都是防治奥灰岩含水层突水的关键问题。
Therefore, study on the deformation and breakage law of upper and down floor of coal layer, the character of formation, each fault factor are the key problem for prevention the water inrush.
沙曲煤矿山西组煤层开采过程中，煤层顶底板砂岩含水层构成煤层开采时的直接充水含水层。
In the process of Shanxi formation seam mining in Shaqu Colliery, the seam roof and floor sandrock aquifers constitute the direct discharge aquifers.
另外，当遇到承压含水层时，由于上部土体的卸荷，坑底有被顶破而发生涌砂、隆起的危险。
In addition, foundation base may be in dangerous conditions such as sand pipings and upheaval deformations because of unloading soil above artesian aquifer.
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