中文摘要：

突水是威胁煤矿安全生产的重大灾害之一。以义安煤矿704工作面突水事故为例,采用非线性渗流模型模拟突水瞬态流动全过程,探讨突水过程中流速和压力的变化规律,揭示矿山突水全过程的流态转捩机制。研究表明：义安煤矿突水达到最大涌水量时,含水层的压力在0.2～0.3 MPa之间,突水实际上是一个降压加速的过程,含水层压力骤降是突水发生的前兆,且突水通道进出口压力和流速是动态变化的,3个流场有机地组成一个不可分割的整体。撑子面处突水流体涡旋是层流向紊流过渡的空间响应,表明矿山突水存在流态转捩过程。通过进一步研究发现突水通道的导水性能越强,发生突水灾害时危害越大。研究结果可为反演确定合理的工程渗流力学参数和突水通道的几何结构提供参考。

英文摘要：

Water inrush is one of the great disasters which threaten coal mine safety production. In order to discuss the law of velocity and pressure and reveal the change of flow state of water-inrush in mines,a non-linear flow model is used to simulate the complete flowing process of water-inrush in Yi＇an coal mine. The study results show that when the water-inrush in Yi＇an coal mine reaches to the maximum water emission,the pressure of aquifer is 0. 2 ~ 0. 3 MPa. Water-inrush is actually a process with pressure decreasing and velocity increasing,and the pressure drop of aquifer is the precursor of water-inrush. Besides that,the pressure and velocity varying at the out-inlet of the water-inrush channel are changed dynamically,the three flow fields are composed of an an integral whole. The vortex of water-inrush is the spatial response of laminar to turbulent flow,which indicates that the water-inrush is a process of flow translation. The further study results show that the stronger of water infiltration characteristics in water-inrush channel,the greater of water-inrush disaster. The above analysis results in this paper can provide some reference for confirming the reasonable mechanics parameters and the geometric structure of water-inrush channel.