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为从根本上研究煤层开采工程中因顶板冒落、放顶垮落造成的顶板突水通道的变化规律,首次运用FLAC3D数值软件的应力-渗流耦合系统,结合工程实践,系统分析了采动岩体的渗流矢量、渗流速度、孔隙压力及导水边界线动态发展的普遍规律和分布特征,进行了顶板突水危险区域的识别,得出了一些对防治采场顶板突水有益的结论,可为煤矿顶板突水防治提供理论依据.数值模拟结果表明采动岩体渗流通道的发展明显受煤层开采的影响,且当主关键层破断时,采场最易发生顶板突水事故.在此基础上,将采场的渗流动态变化特征与采动岩体的破断、运动规律结合分析,给出了采场顶板破断及破断岩块再组合压实过程中渗流裂隙的扩展、闭合普遍演化过程.如果水源有限且现有设备能及时排除水患,当煤层采完后,采动岩体能重新压实闭合失去导水性能,地下水位能逐步恢复,即保护第四系及地表水的采煤技术可以实现.同时证明FLAC3D的应力-渗流耦合系统能预测并预算采动岩体裂隙产生、发展、闭合及相关危害性的可靠的数值定量分析软件,可作为一个新方法在顶板突水防治和保水采煤技术中应用.图5,表1,参11.
In order to fundamentally study the variation law of roof water inrush caused by roof caving and roof caving in coal seam mining project, the stress-seepage coupling system of FLAC3D numerical software is firstly used. Based on engineering practice, Body seepage vector, seepage velocity, pore pressure and the general rules and distribution characteristics of the dynamic development of the water-conducting boundary line, identify the danger zone of water inrush from the roof, and draw some conclusions that it is beneficial to prevent water inrush from the roof of the stope. Which provides a theoretical basis for coal mine roof water inrush prevention and control.Numerical simulation results show that the development of seepage channel of mining rock mass is obviously affected by coal seam mining and the roof caving accident is most likely to occur when the main key is broken , Combining the dynamic change characteristics of seepage flow and the breaking and moving law of the mining rock mass, the expansion and closure general evolution of seepage fissure during the combination of roof crushing and broken rock block are given. Limited water resources and existing equipment can promptly rule out flooding. When the coal seam is collected, the mining rock mass can be re-compacted and closed and lose water conductivity, and the groundwater level can be gradually restored , That is, the coal mining technology that can protect the Quaternary and surface water can be achieved.At the same time, it is proved that the stress-seepage coupling system of FLAC3D can predict and predict the reliable numerical quantitative analysis software of rock mass fissure production, development, closure and related hazards , Can be used as a new method in the roof water inrush prevention and water-holding coal mining technology. Figure 5, Table 1, Senate 11.