断层影响下底板突水通道研究

发布时间：2018-04-03 01:37

本文选题：断层　切入点：底板隔水层　出处：《煤炭工程》2015年12期

【摘要】：基于岩体极限平衡理论,综合考虑断层本身性质和矿山压力中应力降低区的作用,解得底板隔水层的极限水压解析式,推导出底板突水力学判据,结合华泰煤矿7502工作面,解得底板隔水层的极限水压大于实际承压水水压,底板隔水层中没有形成突水通道;基于FLAC3D流固耦合理论,建立了断层影响下煤层开采的数值模型,得出断层带中的承压水导升高度(8m)较正常岩层(6m)高,断层影响下底板岩体应力呈非对称分布,断层附近的底板采动破坏深度(24m)大于未受断层影响的底板破坏深度(20m),底板破坏区与断层导通,承压水通过断层进入破坏区,形成突水通道,发生底板突水。结果表明:断层影响下的底板突水,往往不是底板隔水层破坏导致,而是承压水通过断层进入采动破坏区所致。
[Abstract]:Based on the limit equilibrium theory of rock mass, considering the character of fault itself and the effect of stress reduction area in mine pressure, the analytical formula of limit water pressure of the water partition layer of floor plate is obtained, and the hydraulic criterion of outburst of floor plate is deduced, combined with the 7502 face of Huatai Coal Mine.It is found that the limit water pressure of the bottom layer is greater than that of the actual confined water, and no water inrush is formed in the bottom layer. Based on the FLAC3D fluid-solid coupling theory, the numerical model of coal seam mining under the influence of fault is established.It is concluded that the confined water conductivity in the fault zone is 8 m) higher than that in the normal rock layer (6 m), and the stress distribution of the floor rock mass is asymmetric under the influence of the fault.The depth of mining failure near the fault is 24m), which is more than that of the unaffected floor (20 m / m). The failure zone of the bottom plate is connected with the fault, and the confined water enters the damage area through the fault, forming a water inrush channel and water inrush from the bottom plate.The results show that the water inrush of the bottom plate under the influence of the fault is usually caused not by the destruction of the bottom water barrier, but by the confined water entering the mining failure zone through the fault.
【作者单位】：山东科技大学矿业与安全工程学院;
【基金】：国家自然科学基金(51274135,51034003,51428401)
【分类号】：TD745

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