采动影响下隐伏陷落柱突水数值模拟

Numerical Simulation of Mining Effect on Water Inrush of Hidden Karst Collapse Pillar

以塑性区范围、裂隙内的液体压力和渗流速度为评判依据,分析隐伏型陷落柱受开采扰动的突水危险性。根据流固耦合理论,采用FLAC3D软件实现隐伏型陷落柱突水进行数值模拟,分析了开采扰动下不同隐伏深度的突水过程。研究表明,在开采扰动下陷落柱会从底部开始产生剪切破坏并剪切破坏面向上扩展,当陷落柱周围的破坏区域与工作面周围破坏区域贯通就会发生突水;陷落柱隐伏深度越小,开采扰动对的陷落柱内渗流场的影响越大;当陷落柱隐伏深度低于30 m时,存在突水的危险性。

In this paper,the developing of plastic zone,the change of pore pressure in the fissure zone and the change of seepage quantity were used as criterion to study water inrush risk of hidden Karst collapse pillar with mining disturbance.By stress-fluid coupling formula and FLAC3 Dsoftware,the water inrush process of hidden Karst collapse column under the impact of mining disturbance and hidden depth was numerically simulated.The results showed that plastic zone developed in the form of shear failure from the bottom of hidden collapse pillar with mining disturbance,when the plastic zone near hidden Karst collapse pillar connected with the plastic zone near working face,the groundwater inrush occurred.The impact of mining disturbance is much more in the hidden Karst collapse pillar with thinner hidden depth.When the thickness of hidden depth is less than 30 meters,there is a greater possibility of water inrush in actual project.