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在陷落柱侧壁突水研究中引入厚壁筒力学模型,将陷落柱侧壁煤柱视为多孔介质,考虑地下水的渗流体积力,应用摩尔库伦强度理论和弹塑性力学模型,推导出煤柱弹塑性状态应力解析式,以及煤柱内塑性区半径与水压力的关系表达式,同时编程试算出陷落柱侧壁突水的临界水压力。在此基础上,分析了煤柱孔隙率、煤柱抗剪强度参数以及煤柱宽度等因素对陷落柱侧壁突水的临界水压力的影响规律。研究结果表明:1煤柱能够承受的临界水压随着煤柱孔隙率的增加而降低,故当煤柱裂隙发育时,不考虑渗流力的结果将偏于安全;2煤柱宽度越大、抗剪强度越高,则临界水压越大,陷落柱侧壁突水的危险性越低;3可通过注入水泥浆液减小煤柱孔隙率和提高煤柱强度来防止陷落柱侧壁突水,同时可减少煤柱的留设宽度,对减少煤炭损失有着重要意义。
In the research of water inrush from side wall of collapse column, a thick-walled cylinder model is introduced to consider the coal pillar on the side wall of the falling column as porous media. By considering the seepage volume force of groundwater and using the molar coulomb strength theory and elastoplastic model, Elastoplastic state stress analysis, as well as the coal zone plastic zone radius and water pressure relationship expression, while trying to calculate the subsidence column water inrush water critical pressure. On this basis, the influences of the porosity of pillars, the shearing strength parameters of pillars and the width of pillars on the critical water pressure on the side walls of collapse columns are analyzed. The results show that the critical pressure of 1 coal pillar can decrease with the increase of coal pillar porosity. Therefore, when the fracture of coal pillar develops, the result without considering the seepage force will be safer. The bigger the coal pillar width, The higher the shear strength is, the higher the critical pressure is, and the lower the risk of water inrush from the side wall of the sinker column.3 The water inrush from the side wall of the sinker column can be prevented by injecting cement slurry to reduce the porosity of coal pillar and increase the strength of coal pillar , And at the same time reduce the reserved pillar width, which is of great significance to reducing the coal loss.