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一当某地存在着二个以上的彼此隔离良好的含水层时,为了分别求出各个含水层的渗透系数,需要进行分层抽水试验。分层抽水试验要求在上部含水层的抽水工作完成之后,对上部含水层进行止水,以便能够单独地对下部含水层进行抽水试验。在某些情况下,为了节省管材和止水时间,不单独对各个含水层分别进行抽水试验,而对所有含水层共同进行所谓“混合抽水试验”。这种混合抽水试验只能求得全套地层的加权平均的渗透系数。
When more than two well-isolated aquifers exist in a certain place, a stratified pumping test is required to determine the permeability of each aquifer separately. The stratified pumping test requires that the upper aquifer be dewatered after the pumping of the upper aquifer is completed so that the lower aquifer can be individually primed. In some cases, in order to save pipe and stop water, each aquifer is not separately tested for pumping, while all aquifers are collectively referred to as a “mixed pumping test.” This hybrid pumping test can only obtain the weighted average permeability of the complete set of formations.