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为了揭示流固耦合作用下的煤矿底板陷落柱突水机理,基于破碎岩体渗流理论、固液两相流、地下水动力学等理论,建立了考虑颗粒迁移的陷落柱流固耦合动力学模型.采用理论分析、数值模拟和工程实践相结合的方法对颗粒迁移作用下陷落柱的渗透特性进行了研究,得到了陷落柱孔隙率、渗流速度、孔隙水压力、流体中颗粒体积分数、涌水量等参数随时间变化规律.结果表明:随着时间增加,陷落柱充填颗粒在流固耦合作用下不断被侵蚀成悬浮颗粒并迁移流失,流体中颗粒体积浓度剧增后骤减;陷落柱的整体渗透性起初增加较慢,随着颗粒的不断迁移流失,孔隙率、渗流速度、涌水量快速增大后趋于稳定.
In order to reveal the mechanism of water inrush from collapsed column in coal mine floor under the action of fluid-structure interaction, a fluid-solid interaction dynamics model of collapse column considering particle migration was established based on seepage theory of broken rock mass, solid-liquid two-phase flow and groundwater dynamics. Through the combination of theoretical analysis, numerical simulation and engineering practice, the infiltration characteristics of subsidence column under particle migration were studied. The porosity, permeation velocity, pore water pressure, volume fraction of particles in the fluid, water influx and so on The results show that with the increase of time, the filling particles in the falling column are continuously eroded into suspended particles by fluid-solid coupling and migrate away. The volume concentration of particles in the fluid increases sharply and then decreases sharply. The overall penetration of the falling column The initial increase of sexual slow, with the continuous migration of particles lost, porosity, seepage velocity, water inflow quickly increased and then stabilized.