摘要
The hydraulic conductivity of saturated clays is commonly determined either directly by monitoring water flux or indirectly based on Terzaghi’s consolidation equation.Similar results are generally obtained from the two methods,but sometimes a significant difference can be observed,in particular for expansive soils.In this study,the hydraulic conductivities determined by the two methods are first compared based on existing data in the literature.The indirect method is then revisited attempting to explain the difference identified.A modified effective stress,considering physico-chemical interaction between face-to-face oriented particles,is finally introduced to better describe the compressibility of expansive clays and to further improve the indirect method in determining hydraulic conductivity of such soils in the low-compressibility zone.Extra tests were performed on Gaomiaozi(GMZ)bentonite slurry and the results obtained allowed the modified indirect method to be verified.
基金
support of the European Commission by the Marie Sk1odowska-Curie Actions HERCULES Towards Geohazards Resilient Infrastructure Under Changing Climates(Grant No.H2020-MSCA-RISE-2017-778360)
Shanghai Pujiang Talent Program(Grant No.18PJ1410200)。
作者简介
Wei Su,obtained her BSc degree in Environmental Engineering from the Ocean University of China in 2012,and her PhD in Geological Engineering from Tongji University,China,in 2018.She has been affiliated as postdoctoral staff with Department of Geotechnical Engineering,College of Civil Engineering,Tongji University,since 2019.Her research interests include experimental investigations on(1)the hydro-mechanical behaviors of argillaceous rocks;and(2)chemo-hydro-mechanical behavior of engineered barrier materials(expansive clay-based mixtures)for deep geological disposal of nuclear waste.She has participated in numbers of projects supported by the National Natural Science Foundation of China;Corresponding author:Yu-Jun Cui,E-mail address:yu-jun.cui@enpc.fr。
