断层破裂带附近采场采动效应的流固耦合分析

矿井底板突水是一个复杂的多物理场耦合问题,结合含断层破裂带条件下采场开采的工程背景,通过离散元流固耦合分析,研究了采场工作面推进过程中断层带的变形与受力情况以及底板支承压力、渗流矢量和渗流速度的动态发展规律和分布特征。相关模拟结果表明,采场中煤层的开采与断层破裂带之间是相互影响的,以支承压力为代表的采动应力是底板破坏形成导水裂隙带及断层“活化”突水的一个主要诱因,而断层的存在也使得工作面与断层带范围内的围岩应力更加集中,增大了底板破坏突水的危险性。采动过程中,底板破坏所形成的导水裂隙带主要集中在工作面前方及下方围岩中,这些区域渗流速度较大,是形成突水的主要通道。

Hydro-mechanical coupling analysis of mining effect around fault fractured zone

The floor water inrush in coal mine is a complicated multi-physics coupling issue. Combined with fractured zone under the conditions of stope mining background, the coupled hydro-mechanical module of Universal Distinct Element Code (UDEC) is used. And the dynamic development and distribution of fault deformation and stress, floor abutment pressure, flow vector and flow velocity are systematically analyzed as the working face advances. It is shown that the coal mining process of stope sill and faults fractured zone are mutual influenced. The abutment pressure which is representative of mining-induced stress is the main inducement of forming water flowing fracture zone and making activation of fault. While the presence of fault makes the stress more concentrated between working face and faults fractured zone, which increases the risk of floor water inrush. In addition, the water flowing fracture zone mainly concentrated in front of and rear of the working face, which is the main channel of floor water inrush.