• 中文核心期刊
  • 中国科技核心期刊
  • RCCSE中国核心学术期刊

承压水上含断层煤层开采底板突水规律研究

边凯, 李思宇, 刘博, 杨浩, 孙辉

边凯, 李思宇, 刘博, 杨浩, 孙辉. 承压水上含断层煤层开采底板突水规律研究[J]. 煤矿安全, 2022, 53(6): 169-177.
引用本文: 边凯, 李思宇, 刘博, 杨浩, 孙辉. 承压水上含断层煤层开采底板突水规律研究[J]. 煤矿安全, 2022, 53(6): 169-177.
BIAN Kai, LI Siyu, LIU Bo, YANG Hao, SUN Hui. Study on water inrush law of mining floor in coal seam with fault above confined water[J]. Safety in Coal Mines, 2022, 53(6): 169-177.
Citation: BIAN Kai, LI Siyu, LIU Bo, YANG Hao, SUN Hui. Study on water inrush law of mining floor in coal seam with fault above confined water[J]. Safety in Coal Mines, 2022, 53(6): 169-177.

承压水上含断层煤层开采底板突水规律研究

Study on water inrush law of mining floor in coal seam with fault above confined water

  • 摘要: 在深部煤层开采的过程中,承压水水压以及复杂的构造环境是威胁矿井安全生产的重要因素。为研究承压水上受断层影响下底板的突水规律,基于基本力学原理,建立了承压水上受煤层采动影响的围岩受力力学模型,求解断层突水的临界水压力值;同时,基于控制变量法和流-固耦合理论,运用FLAC3D数值模拟软件,从应力场、位移场、渗流场以及破坏区共同耦合作用的角度出发,分析在断层形态以及承压水压力不同的条件下煤层底板突水规律。结果表明:当工作面回采至断层区域附近时,断层倾角对围岩所受垂直应力的影响较大,倾角由30°变换至60°时,所受垂直应力的平均变化率约为-29%;断层宽度主要影响靠近工作面底部断层处的破坏程度,断层宽度越宽,破坏程度越小;含水层水压对断层中所受的孔隙水压力起主导作用;断层的倾角越大、宽度越小,含水层中承压水水压越高,底板发生突水的危险性越强。
    Abstract: In the process of deep coal seam mining, confined water pressure and complex structural environment are important factors threatening mine safety production. In order to study the water inrush law of floor under the influence of fault on confined water, based on the basic mechanical principle, the mechanical model of surrounding rock under the influence of coal seam mining on confined water is established to solve the critical water pressure of fault water inrush. At the same time, based on the control variable method and fluid solid coupling theory, using FLAC3D numerical simulation software, from the perspective of the joint coupling of stress field, displacement field, seepage field and failure area, the water inrush law of coal seam floor under different fault shape and confined water pressure is analyzed. The results show that when the working face is mined near the fault area, the fault dip angle has a great influence on the vertical stress on the surrounding rock. When the dip angle changes from 30° to 60°, the average change rate of the vertical stress is about -29%; the fault width mainly affects the damage degree of the fault near the bottom of the working face. The wider the fault width, the smaller the damage degree; the aquifer water pressure plays a leading role in the pore water pressure in the fault. The greater the dip angle and the smaller the width of the fault, the higher the pressure of confined water in the aquifer, and the stronger the risk of water inrush in the floor.
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