摘要
为了能充分利用抽水试验规范所规定的连续性抽水试验数据资料,原位确定承压含水层不同水头降落漏斗范围的渗透系数(K)、导水系数(T)和储水系数(μ*),基于Theis井流公式及叠加原理导出一种流量变化时无量纲形式的承压含水层降深随时间变化的解析解,提出一种含有参变量的一组无量纲降深-时间标准曲线及相应的配线方法。将变流量抽水试验得到的降深随时间变化的实测曲线与标准曲线进行配线,选择任一匹配点记录其在标准曲线、实测曲线中的坐标值和配线的参变量值,将这些记录值代入相关公式,确定对应某一流量时承压含水层的水文地质参数。以苏锡常南部高速无锡境内的场地抽水试验为例进行实例验证,运用配线法分阶段完成,最终求得该场地2-3粉土层承压含水层在变流量下的渗透系数分别为5. 12×10-4cm/s、2. 54×10-3cm/s、2. 83×10-3cm/s。
In order to make full use of the continues pumping test data to estimate the hydraulic conductivity(K),the transmissivity(T)and the storage coefficient(μ*)of different head depression cones in a confined aquifer,a dimensionless analytical solution of drawdown transients with variable pumping rates was derived based on the Theis formula and the principle of superposition.Furthermore,a new type curve method was proposed.The in-situ pumping test was conducted to obtain the drawdown record perturbed by stepwise rates.Then,the drawdown curve was used to match the corresponding type curve.After that,this method selects one match point and records its coordinate values on both the type curve and the real drawdown curve.By substituting these recorded values into related formulas,the hydraulic parameters of the confined aquifer can be determined.This method was applied to a field pumping test conducted at a southern highway in Wuxi,Jiangsu Province,China.The type curve matching process is implemented in stages.Field test results reveal that the hydraulic conductivity of the confined aquifer with the 2-3 silt layer are 5.12×10^-4 cm/s,2.54×10^-3 cm/s and 2.83×10^-3 cm/s respectively,which are corresponding to three-stage stepwise pumping rates.
作者
周志芳
王萍
李雅冰
吴建
夏文俊
王峻
方忠强
ZHOU Zhifang;WANG Ping;LI Yabing;WU Jian;XIA Wenjun;WANG Jun;FANG Zhongqiang(School of Earth Sciences and Engineering,Hohai University,Nanjing 210098,China;Jiangsu Provincial Traffic Engineering Construction Bureau,Nanjing 210004,China;China Design Group Co.,Ltd.,Nanjing 210014,China)
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第1期7-12,共6页
Journal of Hohai University(Natural Sciences)
基金
国家重点研发计划(2016YFC0402803)
国家自然科学基金(41572209)
关键词
连续性抽水试验
承压含水层
Theis
井流
叠加原理
参数解析解
配线法
参变量
水文地质参数
苏锡常南部高速公路
无锡境内场地
continues pumping test
confined aquifer
Theis formula
the principle of superposition
parametric analytical solution
type curve method
valuable parameters
aquifer parameters
Southern SuXiChang highway
field in Wuxi
