大武水源地断裂带关键水动力参数确定及污染防治对策

大武水源地地处山东省淄博市，区内建有某大型石化基地。水源地断裂带附近地下水曾受到来自地面石油化工污染物影响，亟需针对性治理修复。精准确定开采背景下岩溶水的实际流向、径流速度和渗透系数等关键参数是污染治理研究的关键。基于国际新兴的井孔地下水胶体探测技术，在该水源地断裂带污染段布设7眼探测孔，开展21个层位的原位系列探测，应用优势流理论和地质统计学方法确定关键水动力参数。结果表明:（1）大武岩溶水源地断裂带附近含水层强径流层位（易污染段）位于奥陶系八陡组下部（O_2-3b）至奥陶系阁庄组（O₂g）上部地层，65 m以浅的侧向流入补给是该水源地岩溶地下水污染的主要来源；（2）该水源地断裂带附近岩溶地下水具有多元质点流向，不同区段或层位实际水流方向和流速差异较大，揭示了断裂带对水源地的非单一层位影响，指明了水力屏障井混合开采的不利影响；（3）建议调整水力屏障井的抽排层位与强度，加强70 m以浅的抽排强度，使得SW95正西方向上的径流流速明显小于50.30 m/d；减小80~110 m深度的抽排强度，使得SW99正西方向上的径流流速明显小于49.38 m/d。

Determination of the key hydrodynamic parameters of the fault zone using colloidal borescope in the Dawu well field and strategies for contamination prevention and control

The Dawu well field is located in a large petrochemical production base area near the city of Zibo. Groundwater near the fault zone in the well field area was affected by the surface petrochemical pollutants, and it is in urgent need of targeted treatment. However, how to accurately determine the actual flow velocity, runoff velocity and hydraulic conductivity in the karst aquifer under the background of large-scale pumping is the key for effective pollution control. In this paper, based on the newly developed technology of colloidal borescope, seven detection wells are arranged in the selected 21 layers in the polluted section of the fault zone in the well field area and the dominant flow theory and geostatistical method are employed. The results show that (1) the strong runoff layer (easily polluted) of the aquifer near the fault zone in the Dawu karst groundwater well field area is located from the lower part of the Badou Formation (O_2-3b) to the upper part of the Gezhuang Formation (O₂g), and groundwater within 65 m is the main water source of karst groundwater pollution in the area. (2) Groundwater near the fault zone has multiple particle flows, and the runoff direction and flow velocity in different sections are quite different, which is related to the pumping intensity. (3) In the treatment of groundwater pollution in the Hougao section, optimization and adjustment of groundwater exploitation should be made: the transportation of shallow flow (70 m) should be reduced to greater than the runoff velocity of SW95 (50.30 m/d), and the transportation of 80~110 m should be reduced to less than the runoff velocity of SW99 (49.38 m/d).