采动影响下底板隐伏陷落柱突水灾变数值分析

黄勇; 林志斌

采动影响下底板隐伏陷落柱突水灾变数值分析

黄勇,
林志斌

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出版历程
- 发布日期: 2021-05-19

Numerical analysis on water inrush catastrophe of concealed collapse column of floor under mining

摘要

摘要: 为研究采动影响下底板隐伏陷落柱的渗流演化规律及突水灾变特征，以1个隐伏陷落柱工程为背景，考虑流固耦合作用以及围岩渗透系数的动态变化特征，模拟再现隐伏陷落柱随工作面开挖前进的突水灾变过程；在此基础上，研究隐伏陷落柱发育高度以及水压对煤层底板突水的影响。结果表明：当工作面开挖通过陷落柱时，陷落柱与煤层间的导水裂隙通道起始于陷落柱顶部最前方而终于煤层底板距陷落柱中心约20 m的位置；随着工作面的向前推进，煤层底板的涌水量大体呈“S”型曲线分布，其在工作面靠近并通过陷落柱时增大速率最快，而在工作面远离陷落柱中心35 m后逐渐保持稳定；陷落柱距煤底越近，煤层底板涌水量发生快速增长的时间点就越靠前且其增长区间范围也越大，同时煤层底板的涌水量与其距陷落柱的距离呈指数衰减式关系；当工作面推进距离相同时，煤层底板的涌水量与陷落柱水压呈指数递增关系。
- 隐伏陷落柱 /
- 突水灾变 /
- FLAC3D /
- 渗透系数 /
- 涌水量
Abstract: In order to study the characteristics and evolution for water inrush catastrophe of concealed collapse column of floor under mining, a concealed collapse column project was taken as the background. The process of water inrush catastrophe of concealed collapse column under different driving distances of working face was reproduced by considering fluid-solid coupling effect and dynamic change characteristics of surrounding rock permeability coefficient. On this basis, the influence of development height and water pressure of concealed collapse column on coal floor water inrush was studied. The research results show that: when the working face is excavated through the collapse column, the water-conducting fissure channel between the collapse column and the coal seam starts at the front of the top of the collapse column and ends at a position about 20 m from the coal seam floor to the center of the collapse column. With the excavation advancement of working face, the water inflow of coal floor is generally distributed in an “S” curve, which increases fastest when the working face is close to and passes through the collapse column, and gradually stabilizes after the working face is 35 m away from the center of collapse column. The closer the collapse column is to the coal bottom, the faster the time point at which water inflow of coal seam floor increases rapidly and the greater the range of its growth interval. At the same time, the amount of coal floor water inflow is exponentially decayed with the distance from collapse column top. When the driving distance of working face is same, the water inflow of coal floor has an exponentially increasing relationship with the water pressure of collapse column.
- concealed collapse column /
- water inrush catastrophe /
- FLAC3D /
- permeability coefficient /
- water inflow

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