渗水试验在油库工程防渗分区设计中的应用

APPLICATION OF SEEPAGE TEST IN DESIGN ZONING OF OIL DEPOT SEEPAGE PREVENTION

污染物从地表进入地下水,必然要经过包气带,包气带的防污性能直接影响地下水污染程度和状况。以广东某油库建设项目为例,通过现场双环渗水试验,获取天然包气带垂向渗透系数,评价包气带防污性能,为防渗设计分区提供依据,从而达到保护土壤及地下水资源的目的。经试验数据处理计算,项目库区包气带的垂向渗透系数范围为0.039~0.047 m/d,结合地层厚度,判断库区天然包气带防污性能为“中”。综合考虑污染控制难易程度,判断项目库区为重点防渗区。

When pollutants enter into groundwater from the surface,they must pass through the vadose zone.The antifouling performance of vadose zone affects the degree and status of groundwater pollution directly.Taking an oil depot construction project in Guangdong Province as an example,the vertical permeability coef-ficient of natural gas vadose zone is obtained through field double ring water seepage test.The antifouling performance of vadose zone is evaluated.These provide basis for anti-seepage design zoning.Thus,the pur-pose of protecting soil and groundwater resources can be achieved.According to the test data processing and calculation,the vertical permeability coefficient of the vadose zone in the project reservoir area ranges from 0.039 m/d to 0.047 m/d.Combining with the formation thickness,the antifouling performance of the natural va-dose zone in the reservoir area is estimated to be“me-dium”.Taking the difficulty in pollution control into comprehensive consideration,the project reservoir area is determined to be the key seepage prevention area.