基于工作面顶板疏放水的含水层水力联系研究

发布时间：2018-10-25 07:41

【摘要】：为了弄清蒙陕接壤区深埋煤层某矿井白垩系志丹群与3-1煤层顶板含水层之间的水力联系情况,在首采工作面顶板疏放水过程中,开展了大气降水、含水层水位和水化学变化等方面的研究,结果表明:通过对首采工作面顶板水提前疏放,使切眼附近钻孔涌水量降至3~5 m3/h,水压降至1.0 MPa左右,形成了较稳定的降落漏斗。在疏放水过程中,志丹群含水层水位基本保持稳定,3-1煤层顶板含水层水位则下降明显;志丹群与3-1煤层顶板含水层水在矿化度、水化学类型等方面差异明显,且放水过程中水化学特征基本不变,表明志丹群低矿化度水未进入3-1煤层顶板含水层。安定—直罗组地层未发育沟通上下含水层的导水通道,志丹群与3-1煤层顶板含水层之间水力联系较差,为矿井安全生产提供了必要的地质保障。
[Abstract]:In order to find out the hydraulic connection between the Cretaceous Zhidan group and the roof aquifer of 3-1 coal seam in a deep buried coal mine in the contiguous area of Mongolia and Shaanxi, the precipitation of the atmosphere was carried out in the process of drainage from the roof of the first mining face. The study on the water level and water chemistry of the aquifer shows that the water discharge of the borehole near the cutting hole is reduced to 3 ~ 5 m3 / h and the water pressure to about 1. 0 MPa, and a more stable falling funnel is formed through the early drainage of the roof water in the first mining face, and the borehole discharge near the cutting hole is reduced to 3 ~ 5 m3 / h and about 1. 0 MPa. In the process of drainage, the water level of the aquifer of Zhidan group is basically stable, while the water level of the roof aquifer of coal seam 3-1 decreases obviously, while the water level of the roof aquifer of Zhidan group and the roof aquifer of coal seam 3-1 is obviously different in the aspects of salinity, hydrochemical type, etc. The chemical characteristics of water in the process of water discharge are basically unchanged, which indicates that the low salinity water of Zhidan Group does not enter the roof aquifer of coal seam 3-1. The formation of Andian-Zhiluo formation has not developed a channel to communicate with the upper and lower aquifers, and the hydraulic connection between the Zhidan group and the roof aquifer of the 3-1 coal seam is poor, which provides the necessary geological guarantee for the safe production of the coal mine.
【作者单位】：中煤科工集团西安研究院有限公司;陕西省煤矿水害防治技术重点实验室;
【基金】：国家自然科学基金项目(41302214,41402220) 中国煤炭科工集团有限公司科技创新基金项目(2014MS003)
【分类号】：TD163;TD74

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