矿井闭坑充水对邻矿水害的影响研究
Study on the Influence of Water Filling for Mine Closed Pit on Adjacent Mine Water Disaster
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摘要: 为研究矿井闭坑后边界煤柱的稳定性和隔水性,运用FLAC3D数值模拟软件,通过研究三河尖矿井闭坑后地下水的运移及水位回升规律以及断层导水性的变化情况,对围岩破坏场和渗流场进行数值模拟,分析采空区充水后高水压下的渗流规律,考察围岩破坏场和渗流场的耦合情况。结果表明:三河尖矿与姚桥矿工作面开采的破坏区域均未出现重叠导通的现象,满足对煤柱安全性的要求;采动岩体渗流通道的发展明显受煤层开采的影响,相对于不导水断层,导水断层渗流场波及范围明显增大;F19断层不导水与导水情况时,姚桥煤矿工作面塑性破坏场均未与三河尖煤矿工作面的渗流场贯通,边界煤柱的隔水性良好。Abstract: In order to study the stability and water isolation property of the boundary coal pillars after the mine is closed, FLAC3D numerical simulation software is used to the regularity of groundwater migration and water level rise as well as the variation of fault conductivity after the closure of the pit in Sanhejian Mine. The damage field and seepage field are numerically simulated, the seepage law under high water pressure is analyzed after the goaf is filled with water, the coupling between the surrounding rock damage field and the seepage field is evaluated. The results show that there is no overlapping conduction for the damage area of working face mining between Sanhejian Mine and Yaoqiao Mine, which meets the requirements for the safety of coal pillars. The development of seepage channels in mining rock masses is obviously affected by the mining of coal seams. Compared with non-conductive faults, the seepage field of water-conducting faults has a significantly larger scope. When the F19 fault is non-conductive and water-conducting, none of the plastic failure fields in the working face of Yaoqiao Coal Mine has penetrated the seepage field in the working face of Sanhejian Coal Mine, and the water isolation property of boundary coal pillars is good.
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