基于底板砂岩含水层放水试验的多含水层水力联系研究

Study on Hydraulic Connection of Multiple Aquifers Based on Dewatering Test of Sandstone Aquifer from Floor

为了查明侏罗纪煤田煤层底板宝塔山砂岩含水层与其他各含水层的水力联系,采用井下放水试验,对宝塔山砂岩含水层进行大流量放水,通过长观孔对其他各含水层地下水位进行同步观测;根据不同含水层水位对宝塔山砂岩含水层放水的响应,确定了白垩系、煤系间与三叠系含水层与宝塔山砂岩含水层具有明显的水力联系;依据各含水层地下水水化学垂向与平面特征,认为井田西部宝塔山砂岩含水层交替积极,径流条件好,DF20为宝塔山砂岩含水层与其他含水层的水力联系通道;结合各含水层地下水流场分析,确定了宝塔山砂岩含水层与白垩系含水层通过DF20断层向煤系间含水层补给。

In order to find out the hydraulic connection between Baotashan sandstone aquifer from the floor of coal seam and other aquifers in the Jurassic coalfield,the underground dewatering test is adopted.The Baotashan sandstone aquifer is drained with large water flow,and the groundwater levels of other aquifers are observed by long-time observation boreholes synchronously.According to the response of different aquifers water level to the dewatering process from Baotashan sandstone aquifer,it is determined that the cretaceous aquifer,aquifer between the coal seams and triassic aquifer have obvious hydraulic connection with Baotashan sandstone aquifer.According to the vertical and plane characteristics of groundwater hydrochemistry of each aquifer,it is considered that the Baotashan sandstone aquifer in the west of the coalfield has positive alternation and good runoff condition,and DF20 fault is the hydraulic connection channel between the Baotashan sandstone aquifer and other aquifers.Based on the analysis of the groundwater flow field of each aquifer,it is determined that the Baotashan sandstone aquifer and cretaceous aquifer feed the aquifer between the coal seam through DF20 fault.