杭州亚运村大小口径抽水试验对比分析与研究

In-Situ Groundwater Pumping Tests with Various Well Diameters in Hangzhou Asian Game Village Site

目前水文地质参数的获取主要采用抽水试验,针对上部潜水含水层及下部承压水含水层,抽水试验应用的抽水井口径都相对较大,可以较好的避免因为抽水井本身所造成的一些误差,提高试验的精确度。市政项目在进行前期的勘探期间,受场地条件制约,往往无法进行大口径的抽水试验,大都采用小口径的抽水试验进行替代。以杭州亚运村为项目背景,针对杭州典型的潜水含水层(粉土、粉砂层)及下部承压含水层(圆砾层)进行现场试验,现场进行了小口径和大口径的抽水试验,根据试验成果,对比分析小口径与大口径抽水试验之间的差异性。

In-situ hydrological test is a major method to obtain the hydrological design parameters.For the upper perched and the lower artesian groundwater parameters,large well diameter for pumping is usually required in order to minimize the testing error from the well installation.However,due to the site condition constraint in the preliminary investigation phase for the municipal projects,the well pump tests are performed with the relatively small well diameters.This paper presents a case history of the well pump test in Hangzhou Asian Game Village.In-situ tests were performed in the upper perched in silt and silty fine sand and lower artesian groundwater in rounded ground layers with various well diameters.The results were evaluated and the differences between the small and large well diameters were obtained.