带压开采底板突水预测研究

为了有效预测工作面在带压开采下底板突水，以上孔煤业15#煤层为研究背景，通过塑性理论和经验公式分别计算底板的破坏深度|考虑采动与赋存因素影响，基于修正的突水系数法，提出极限突水系数公式，确定合理的工作面尺寸，提高突水预测精度。现场施工水文钻孔探查底板涌水情况，并根据岩芯测得底板隔水层物理力学性质，与理论推算结果对比，对15#煤层底板突水可能性进行有效预测。研究结果表明：底板主要隔水层属于中等坚硬岩石类，具有较好的隔水性能，底板含水层含水性弱，不具备底板突水的条件。极限突水系数计算结果显示，15#煤层在底板完整区段无突水危险，受构造破坏的区段具有底板突水的危险，建议减小工作面尺寸，查明底板地质特征，并加强在构造等薄弱区域的探放水以预防突水危险发生。

Study on prediction of floor water inrush in pressurized coal mining

In order to effectively predict the floor water inrush under the pressurized mining in the working face, based on No.15 coal seam in a coal mine as a study background. The failure depth of the floor is calculated by using the plastic theory and the empirical formula. Considering the influence of mining and occurrence factors, and based on the modified water inrush coefficient method, the formula of limit water inrush coefficient is put forward to determine the reasonable working face size and improve the accuracy of water inrush prediction.The water inrush of the floor is explored by site construction hydrological drilling, physical and mechanical properties of floor resisting stratum measured by the rock core，and comparison with theoretical calculation results. The possibility of water inrush from the floor of 15# coal seam is effectively predicted. The results show that: The main water-resisting layer of floor belongs to medium hard rock, which have water separation performance. The water content of the floor is weak, and there is no condition for water inrush from the bottom plate. The calculation results of ultimate water inrush coefficient show that there is no risk of water inrush in the complete section of the floor of the coal seam, but in the structure damaged fault section have. It is suggested to reduce the size of working face properly, find out the geological characteristics of the floor, and strengthen the water exploration and drainage in the weak areas such as the structure to prevent the water inrush risk.