微水试验方法在天津地区求取渗透系数应用对比分析

Comparative Study on the Application of Slug Test Method for Permeability in Tianjin

为解决天津地区微水试验求参方法应用过程中计算参数可靠性分析问题,通过开展现场微水试验-抽水试验,以及参考室内土工试验结果,对其进行分析,研究结果表明:微水试验方法采用Hvorslev模型、Bouwer&Rice模型计算渗透系数,对天津地区含水层特性及现有成井工艺适用性相对较好,具有推广应用的可行性;采用Bouwer&Rice模型计算的渗透系数略低于抽水试验裘布依公式计算结果,采用Hvorslev模型计算的渗透系数略高于抽水试验裘布依公式计算结果,但抽水试验与微水试验两种方法获得的渗透系数相对偏差小于10%,可见天津地区微水试验在一定条件下可替代抽水试验快速求取渗透系数,具有一定可靠性。

In order to solve the problem of reliability analysis of parameters calculation in the application of slug test in Tianjin,a comparative study of field test between pumping test and slug test was carried out by indoor geotechnical test.The results show that:in Tianjin area the slug test which adopt Hvorslev model and Bouwer&Rice model to calculate the hydraulic conductivity can adapt the characteristics of aquifer and the applicability of existing well completion technology,therefore it is a method with great feasibility and can be very popular in application;the calculated value of hydraulic conductivity of pumping test is generally higher than that of Bouwer&Rice model and lower than that of Hvorslev model,and the relative deviation between the calculated value of hydraulic conductivity from pumping test and slug test is relatively small,which is generally lower than 10%.It can therefore conclude that the slug test in Tianjin area can replace the pumping test to get the hydraulic conductivity quickly under certain conditions.