煤矿陷落柱突水主控因素研究
Study on Main Control Factors for Karst Collapse Column Water Inrush in Coal Mines
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摘要: 研究煤矿底板承压导水陷落柱冲蚀突水主控因素对于揭示陷落柱突水机理并指导其突水防治具有重要意义。建立陷落柱冲蚀突水力学模型,利用多物理场耦合软件COMSOL Multiphysics将力学模型数值化,考虑陷落柱内裂隙的非均匀分布特性,模拟研究冲蚀作用下陷落柱突水的全过程,分析水压、初始裂隙分布以及裂隙发育程度等主控因素对陷落柱突水的影响。结果表明:含水层水压和初始裂隙开度越大,陷落柱涌水量增加越快,发生突水的危险性越大;初始裂隙分布主要影响最终突水通道的分布情况,对突水时间和涌水量的影响不大;在承压含水层水力冲蚀作用下,陷落柱内充填物颗粒液化并迁移流失,部分裂隙不断增大和贯通并发展成为数条优势导水通道,最终造成陷落柱涌水量的急剧增大和突水事故的发生。Abstract: It is of great significance to study the main control factors of erosion and water inrush from the confined water guiding column of coal mine floor to reveal the water inrush mechanism of the Karst collapse column and to guide its water inrush prevention. The mechanical model of erosion and water inrush of collapse column is established, the multi-physics coupling software COMSOL Multiphysics is used to numeralize the model. The non-uniform distribution characteristics of the cracks in the collapse column are considered to perform the simulation research for the whole process of water inrush of collapse column under erosion action, and the influence of water pressure, initial fracture distribution and fracture development degree on water inrush of collapse column are analyzed. The results show that the greater the aquifer water pressure and the initial fissure opening is, the faster the water inflow from the collapse column increases and the greater the risk of water inrush is. The initial fracture distribution mainly affects the distribution of the final water inrush channel, and has little effect on the water inrush time and water inflow. Under the action of hydraulic erosion of confined aquifer, the filling particles in the collapse column liquefy and migrate away, and some cracks continue to increase and penetrate and develop into several superior water guiding channels, which ultimately causes the sudden increase of water inflow in collapse column and the occurrence of water inrush accidents.
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Keywords:
- karst collapse column /
- water inrush /
- main control factor /
- erosion effect /
- numerical simulation
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