基于放水试验的含水层参数计算及含水层间关系分析

Calculation of Aquifer Parameters and Analysis of Aquifer Relationship Based on Drainage Test

为防止麦垛山煤矿上组煤开采时发生突水溃砂事故,通过施工井下放水孔及水文地质观测孔,对1~2煤间延安组含水层进行放水试验,求得水文地质参数,并通过软件模拟了地下水流场。研究结果表明:1~2煤间延安组含水层与直罗组下段含水层水力联系紧密,受直罗组下段含水层的直接补给,区域内的含水层不存在降不下去的高水位异常区,因此可以采取长时间疏降办法防止顶板突水溃砂。

In order to prevent the occurrence of water inrush and sand burst during coal mining in the upper group of Maiduoshan Coal Mine,drainage tests were carried out on the aquifer of Yan’an Formation between 1 and 2 coal seams through underground water drainage holes and hydro-geological observation holes,and the hydro-geological parameters were obtained,and the underground water flow field was simulated by software.The results show that the aquifer of Yan’an Formation receives direct recharge from the aquifer of lower Zhiluo Formation,that is,the two groups of the aquifer have close hydraulic connection.There is no abnormal area of high water level that cannot be lowered in the aquifer area,so the method of long-time drainage can be adopted to prevent water inrush and sand bursting from roof.