北京昌平高崖口—南口岩溶水分布区水文地质特征

在北京市昌平区高崖口-南口岩溶水分布区,通过水文地质钻探4眼勘查井,进行"非稳定流"抽水试验,采用配线法计算渗透系数、导水系数;按舒卡列夫分类,划分岩溶水水化学类型,并根据Piper图论述了岩溶水水化学特性;根据国家《地下水质量标准》(GB/T14848—93)进行水质标准评价;结果表明区内蓟县系雾迷山组岩溶裂隙含水层空间分布受到南部、西部和西南部3个方向岩浆岩体的明显挤压,空间范围减少,地下水补给受阻,区内东北部南口-孙河断裂上升盘800m以浅,岩溶裂隙发育、渗透性好、导水性强,地下水质量为Ⅲ类,可选作集中生活饮用水水源地靶区。

The Preliminary Understanding on Hydrogeological Investigation of Gaoyakou - Nankou Karst Region in Changping of Beijing

In the karst water distribution area of Gaoyakou–Nankou in Beijing, four exploration holes are drilled for the “non-steady lfow pumping test”. The permeability coefifcient and hydraulic conductivity are calculated by iftting curve method. According to the classiifcation of Shug Kalev, we have classiifed the karst water chemistry types; according to the Piper Chart, discussed the karst water chemistry; according to China national standard of Ground Water Quality Standard (GB/T14848—93), evaluated water quality standards. The research results show that the karst fractured aquifer in Jixian System Wumishan Fm. are obviously pressed by the igneous rock bodies from three directions of south, west and southwest, so the aquifer space range is reduced, recharge of groundwater is blocked. In the below 800m surface zone (hanging wall of Nankou-Sunhe fault in the northeastern study area), the karst ifssures are well-developed, permeability and water conductivity are favorable, and groundwater quality is up toⅢ category. As a result, this area may be selected as the target area of centralized drinking water source.