Studying the stress-suction coupling in soils using an oedometer equipped with a high capacity tensiometer
Studying the stress-suction coupling in soils using an oedometer equipped with a high capacity tensiometer作者机构：Ecole des ponts ParisTechNavier/CERMES6-8av.B.PascalCitéDescartesChamps-sur-Marne77455 Marne-la-Vallée cedex 2France The China Three Gorges UniversityYichang 443002China EURIDICE Groupc/o SCK./CENBoeretang 2002400 MolBelgium
出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)
年 卷 期：2011年第5卷第2期
页 面：160-170页
学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0813[工学-建筑学] 0814[工学-土木工程]
基 金：EURIDICE (European Undenground Research Infn-structure for Disposal of nuclear waste In Clay Environment Mol Belgium)is gatefully acknowledged for the financial support provided for this workthat is part of the fist author's PhD thesis
主 题：Oedometer tensiometer swelling physicochemical and mechanical effects stress/suction coupling soil plasticity
摘 要：In the context of research into deep nuclear waste disposal,various works have concerned the hydromechanical behavior of Boom clay,a stiff plastic clay extracted in the SCK-CEN Underground Research Laboratory near the Mol City(Belgium),at a depth of 223 *** to some amount of smectite minerals in the clay fraction,Boom clay exhibits swelling properties when hydrated under low *** investigate some aspects of the hydromechanical behavior of Boom clay,oedometer compression tests were carried out on samples of Boom clay close to saturation and submitted to an initial *** oedometer compression,the changes in suction with increased vertical stress are monitored by means of a high capacity tensiometer installed at the bottom of the *** aspects related to hydromechanical couplings are examined through the investigation of the changes in suction during oedometer compression,a somewhat delicate and poorly documented experimental approach.A comparison is also made with a completely different soil sample under suction,i.e.a statically compacted unsaturated low plasticity *** technical difficulties typical of this new experimental approach are first described in detail so as to optimize the interpretation of the data *** experiment allows the determination of the point at which suction is changed to positive pressure during *** this point,the ratio between the vertical stress and the change in suction are *** this point,the data show that positive pore pressures are dissipated in a common *** suction/stress behavior during unloading is also described and ***,an interpretation in terms of microstructure effects is provided for both *** experimental approach initiated here seems to provide interesting further application to better understand hydromechanical couplings in natural soils in relation with suction increase during stress release.
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