基于应力-渗流-损伤耦合采空区渗流场变化规律研究

Research on Change Law of Seepage Field in Goaf Based on Stress-seepage-damage Coupling

基于“应力-渗流-损伤耦合”理论,运用数值模拟软件COMSOL Multiphysics对深受顶部承压含水层威胁的合山三矿4106工作面开展数值模型研究。结果表明:采空区顶板涌水量在同一水头压力下的变化可分为缓慢增加、快速增加、缓慢增加三个阶段,同一开采步距下,与水头压力呈线性关系;采空区顶板单位面积涌水量随开采步距增大依次可分为缓慢上升、快速上升、缓慢下降三个阶段。渗流场变化规律的研究对近水平煤层开采中的顶板突水防治有借鉴意义。

The top of 4106 working face of No.3 Mine of Heshan is threatened by confined aquifer,which poses a great threat to its safety production.Based on the theory of"stress-seepage-damage coupling",this paper establishes a numerical model using COMSOL Multiphysics,and carries out numerical simulation research.The results show that the change of the roof water inflow in the goaf under the same head pressure can be divided into three stages:slow increase,rapid increase and slow increase.Under the same mining step,there is a linear relationship with the head pressure.The water inflow can be divided into three stages:slow rise,fast rise,and slow decline with the increase of mining step.The research on the distribution and variation of seepage field has obvious reference value for mine water hazard prevention and control.