断层影响下底板突水危险性预测

采动底板断层突水危险性预测与评价是煤矿底板突水灾害防治的基础和依据。针对断层诱发底板突水问题，基于岩体极限平衡理论，综合考虑断层本身性质和矿山压力中应力降低区的作用，得出底板隔水层的极限水压解析式，提出突水力学判据。结合工程背景，基于多物理场软件COMSOL Multiphysics建立数值模型，计算了隔水层中承受的实际水压。基于突水力学判据，该矿底板隔水层所承受的极限水压大于隔水层中承受的实际水压，底板隔水层完整，不发生突水。结果表明:底板断层突水危险性预测结果与实际开采过程中结果相吻合。

Prediction of water inrush danger from faults in floor rocks

Prediction and evaluation of water inrush from faults in floor rocks is the basis for the prevention and control of floor water inrush disaster in coal mine. Firstly，based on the theory of rock mass limit equilibrium，considering fault nature and stress decreasing zone of mining pressure，analytic formula of the water resisting floor′s limit pressure was calculated and water inrush criterion was proposed. Secondly，based on the engineering practice，a numerical calculation model by COMSOL Multiphysics was established to calculate the actual water pressure in the water resisting layer. Eventually，the water resisting floor′s limit water pressure is greater than the actual water pressure in the aquifer and water inrush accident did not occur. Results show that:the prediction of water inrush from faults is consistent with the results of engineering practice.