砂土孔隙比对示踪剂法测渗流速度影响的试验研究  

Experimental Study on the Influence of Sand Void Ratio on the Tracer Method for Measuring Seepage Velocity

作　　者：张国新 骆汉轩 王开民 陈亮[2,3] Zhang Guoxin;Luo Hanxuan;Wang Kaimin;Chen Liang(China Power Investment Mengdong Energy Group Co.,Ltd.,Zaha Nuor Industrial Water Supply Branch,Tongliao 028000,Inner Mongolia,China;Geotechnical Research Institute of Hohai University,Nanjing 210098,China;Key Laboratory of Xizang Civil Engineering,Water Conservancy and Electric Power Engineering Technology Research Center,Tibet Agricultural and Animal Husbandry University,Linzhi 860006,Tibet,China)

机构地区：[1]中电投蒙东能源集团有限责任公司扎哈淖尔工业供水分公司,内蒙古通辽028000 [2]河海大学岩土工程科学研究所,南京210098 [3]西藏农牧学院西藏土木水利电力工程技术研究中心,西藏林芝860006

出　　处：《科技通报》2024年第12期59-64,共6页Bulletin of Science and Technology

基　　金：国家自然科学基金项目(U2243244);西藏自治区自然科学基金项目(XZ202301ZR0033G)。

摘　　要：确定地下水流速对工程建设、生态保护等方面具有重要作用,示踪剂法测量渗流速度是工程中常见方法之一。本文以食盐溶液作为示踪剂,利用电导率变化计算渗流速度,通过自行设计的室内试验装置,分析砂土孔隙比对示踪剂法测渗流速度的影响。研究结果表明:不同孔隙比的砂土层在各水力梯度作用下,测试流速均大于实际流速,误差集中在15%~25%;同一孔隙比的砂土层,实际流速与测试流速的比值基本恒定。为此引入砂土孔隙比修正系数,进一步提高示踪剂法测流速的精确度。Determination of groundwater flow velocity is of great importance for engineering construction,ecological protection,and other aspects.The tracer method for measuring seepage velocity is one of the common methods in engineering,using a saltwater solution as a tracer and calculating the seepage velocity based on changes in electrical conductivity,this study analyzes the impact of the porosity ratio of sandy soil on the tracer method for measuring seepage velocity through a self-designed indoor experimental setup.The research results show that:under the action of various hydraulic gradients,the tested flow velocity in sandy soil layers with different porosity ratios is all greater than the actual flow velocity,with errors concentrated between 15%and 25%;For sandy soil layers with the same porosity ratio,the ratio of actual flow velocity to tested flow velocity is essentially constant.Therefore,a correction factor for the porosity ratio of sandy soil is introduced to further improve the accuracy of the tracer method for measuring flow velocity.

关 键 词：示踪剂法 地下水流速 孔隙比 修正系数 

分 类 号：TV223.4[水利工程—水工结构工程]