摘要
由于抽水泵流量远远大于单孔单位涌水量,因而传统抽水试验在低渗透性含水层中"一抽即干",无法形成稳定流。本文利用小直径塑料管代替抽水泵进行了虹吸抽水试验,先进行了3mm和4mm塑料管对比试验,然后采用4mm塑料管,进行二路、四路、六路组合虹吸抽水试验。试验结果表明,多路塑料管的出水能力与低渗透性含水层涌水量匹配,可以形成达西定律要求的稳定流,适用于裘布依稳定流公式,可以计算出该区的渗透系数和影响半径。该试验为低渗透性含水层滑坡区的水文地质勘查提供了一种新的思路和操作手段。
Since the pumping flow rate is much larger than the amount of water flowing in a single hole,the traditional pumping test can not form a stable flow in a low-permeability aquifer. In this paper,the syphonage pumping test is carried out by using small diameter plastic tube instead of pumping pump. The contrast tests with 3 mm and 4 mm plastic tube are carried out firstly,and then two,four and six way combined syphonage pumping tests are carried out with 4 mm plastic tube. The test results show that the water output capacity of the multiplex plastic pipes matches the water inflow of the low-permeability aquifer and can form a stable flow requested by Darcy law. It is suitable for the Dupuit formula,and the hydraulic conductivity and influence radius can be calculated. The experiment provides a new operation for the hydrogeological exploration of the landslide with low-permeability aquifer.
作者
罗晓娟
徐礼强
Luo Xiaojuan;Xu Liqiang(Zhejiang Highway&Water Transportation Engineering Consulting Limited Liability Corporation,Hangzhou 310006,China;Zhenan Comprehensive Engineering Surveying and Mapping Institute,Hangzhou 310000,China)
出处
《工程勘察》
2021年第2期36-40,共5页
Geotechnical Investigation & Surveying
关键词
虹吸抽水试验
低渗透性含水层
水文地质勘查
syphonage pumping test
low-permeability aquifer
hydrogeological exploration
