岩土力学2017，Vol.38Issue(1)：61-66,6.DOI:10.16285/j.rsm.2017.01.008
一种确定超固结弱透水层水力参数的方法
A method for determining hydraulic parameters of an overconsolidated aquitard
摘要
Abstract
Aquitard is an important part of the subsurface aquifer system.Hydraulic parameters of an aquitard,including the vertical hydraulic conductivity Kv and elastic specific storage Sske,are of great importance for the investigation of land subsidence and groundwater resources evaluation.An analytical solution for the flow in an overeonsolidated aquitard is derived in dimensionless form under the condition of drawdown in adjacent aquifers fluctuating cyclically with time.The theoretical curve of cumulative deformation of the aquitard versus time is further derived in dimensionless form as well.Due to the low permeability of the aquitard,its deformation lags behind water level changes in adjacent aquifers.The relationship between the time delay in deformation and half cycle of aquifer drawdown is derived.Then a new method is proposed for estimating Kv and Sske.This method can be applied to an overconsolidated aquitard demonstrating elastic deformation.Before using the new method,the half cycle of cyclical aquifer drawdown and the time delay in aquitard deformation should be determined according to observed extensometer and hydrograph data.The new method is applied to obtain Kv and Sske of the second aquitard at the f10-7 extensometer site in Shanghai area.Field test results demonstrated that Kv and Sske are,respectively,4.12× 10-10 m/s and 1.07× 104 m-1.The results are verified to be reliable.关键词
超固结弱透水层/垂向渗透系数/弹性贮水率/滞后变形Key words
overconsolidated aquitard/vertical hydraulic conductivity/elastic specific storage/time lag deformation分类
建筑与水利引用本文复制引用
庄超,周志芳,李兆峰,郭巧娜..一种确定超固结弱透水层水力参数的方法[J].岩土力学,2017,38(1):61-66,6.基金项目
国家自然科学基金资助项目(No.41572209) （No.41572209）
国家重点研发计划项目(No.2016YFC0402803) （No.2016YFC0402803）
江苏省普通高校研究生创新训练计划项目(No.KYZZ15_0149).This work was supported by the National Natural Science Foundation of China (41572209),the National Key Research and Development Program of China (2016YFC0402803) and the Research Innovation Program for College Graduates of Jiangsu Province (KYZZ15_0149). （No.KYZZ15_0149）
