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Studying the stress-suction coupling in soils using an oedometer equipped with a high capacity tensiometer

Frontiers of Structural and Civil Engineering 2011年第2期5卷 160-170页

作者： Trung Tinh LE Yu-Jun CUI Juan Jorge MUÑOZ Pierre DELAGE Anh Minh TANG Xiang-Ling LI Ecole des ponts ParisTech Navier/CERMES6-8av.B.PascalCitéDescartesChamps-sur-Marne77455 Marne-la-Vallée cedex 2France The China Three Gorges University Yichang 443002China EURIDICE Group c/o SCK./CENBoeretang 2002400 MolBelgium

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.

关键词： oedometer tensiometer swelling physicochemical and mechanical effects stress/suction coupling soil plasticity

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Identification of a Cam Clay Model through Shear-Box and oedometer Tests. Application to Lateritical Soils from Senegal (West Africa)

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Geomaterials 2018年第1期8卷 1-13页

作者： Cheikhou Ndiaye Yves Berthaud Laboratoire de Mécanique et Modélisation-UFR Sciences de l’Ingénieur Université de Thiès Thiès Sénégal Sorbonne Universités UPMC Université Paris 06 CNRS Institut Jean le Rond d’Alembert Paris France

The main objective of this research is to study the mechanical behaviour of tropical soils using elasto-plastic constitutive equations in the so-called limit and critical states. Indeed, researchers of the Cambridge University had noticed that during their various experiments, the rate of volumetric deformation ( ) of the sample tending to zero every time the rupture of the specimen is reached during a test performed on a clay specimen Roscoe et al., 1958. To better understand and clarify this mechanical behaviour, a description has been proposed in the (e, p, q) representation that means void ratio, volumetric stress (spherical pressure) and deviatoric stress. This frame of theoretical study and apprehension is called: the theory of the Critical State. One of the major problems met at the time of our present research is the non-availability of triaxial apparatus allowing us to achieve some tests on tropical soils (samples from Senegal in West Africa) and to describe the behaviour of these materials easily like the researchers of the university of Cambridge in the theory of the critical state. To by-pass this difficulty, we decided to consider two very classical and simple mechanical tests: shear-box and the oedometer test as well as the interrelationship of the results given by the tests and some theoretical calculations. This is a way to identify an elasto-plastic model (the modified Cam Clay model) without any triaxial experiment. Indeed it supposes the model to be suitable to describe the mechanical behaviour of the considered clays.

关键词： Behaviour Elasto-plastic Limit State Critical State Volumetric Distortion Theory Triaxial Shearing oedometer Cam Clay

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Feasibility of using electrokinetics and nanomaterials to stabilize and improve collapsible soils

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第5期11卷 1055-1065页

作者： Arash Hosseini S.Mohsen Haeri Siavash Mahvelati Aria Fathi Department of Civil and Environmental Engineering Temple UniversityPhiladelphiaPA 19122USA Department of Civil Engineering Sharif University of TechnologyTehranIran Department of Civil Engineering The University of Texas at El PasoEl PasoTX 79968USA

Loess as a subcategory of collapsible soils is a well-known aeolian deposit generally characterized as a highly-porous medium with relatively low natural density and water content and a high percentage of fine-grained *** collapsible soil sustains large stresses under a dry condition with natural water ***,it can experience high and relatively sudden decreases in its volume once it reaches a certain water content under a certain load and therefore,the natural condition of the soil might not be suitable for construction if the possibility of the exposure of the soil to excessive water exists during the lifetime of the *** research presents the utilization of an innovative method for stabilization and improvement of Gorgan loessial *** method uses electrokinetics and nanomaterials to instigate additives to move through soil pores,as an in situ remedial *** assess the acceptability of this measure,the deformability and strength characteristics of the improved collapsible soil are measured and compared with those of the unimproved soil,implementing several unsaturated oedometer tests under constant vertical stress and varying matric *** result emphasizes the importance of the matric suction on the behavior of both improved and unimproved *** test results indicate that the resistance of the soil was highly dependent on the water content and matric suction of the *** oedometer tests on samples improved by 3%lime and 5%nanomaterials show considerable improvement of the collapse *** also reveal that stabilized samples experience notably lower volume decrease under the same applied stresses.

关键词： Loess Electrokinetics Collapsible soil Soil improvement Unsaturated oedometer Nanosilica

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Hydromechanical Behavior of Low-Swelling Soils Compacted at Low Water Content: Laboratory Study

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Engineering（科研） 2020年第11期12卷 824-838页

作者： Soumaïla Gandema Marcel B. Kebré Bétaboalé Naon Laboratoire de Matériaux d’Héliophysique et Environnement (LaMHE) Université Nazi-BONI Bobo-Dioulasso Burkina Faso Laboratoire de Matériaux et Environnement (LAME) Université Joseph KI-ZERBO Ouagadougou Burkina Faso

Fine unsaturated soils are used in many applications, particularly in road infrastructure and in construction. These materials undergo deformations according to the stresses to which they are subjected. The purpose of this paper is to study the influence of hydromechanical stresses on the behavior of low swelling soils compacted at low water content in accordance with the French standard GTR 92 (Guide des Terrassements Routiers). Then, various experimental tests on an oedometer were carried out in the laboratory. Two types of low swelling soil sampled in Nasso on the outskirts of the town of Bobo Dioulasso (Burkina Faso) were used. After shuffling, each sample was moistened to its optimum water content and then compacted to 90% and 95% of its optimum density. Behavior tests show that these soils deform very little when subjected to hydromechanical stresses. However, these deformations are swelling in nature for low mechanical stresses and when the stresses are high, they tend to collapse. When these soils are subjected to a vertical stress of 420 kPa, the primary consolidation time is of the order of one minute for NH2 (a silty soil) and about ten minutes for NH3 (a silty-clayed soil).

关键词： Unsaturated Soil Compacted Swelling Low Water Content Wetting oedometer Hydro-Mechanical Behavior

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Intrinsic Compression Behavior of Remolded and Reconstituted Clays-Reappraisal

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Open Journal of Civil Engineering 2013年第3期3卷 8-12页

作者： Jie Yin Yonghong Miao Department of Civil Engineering Faculty of Civil Engineering and Mechanics Jiangsu University Zhenjiang China

Evaluating the impacts of soil structure on mechanical behavior for natural sedimentary clays is an important issue in geotechnical engineering. Burland introduced void index for normalizing the compression curves of various remolded and reconstituted clays to obtain the intrinsic compression line, which provides a reference framework to assess the in-situ compression behavior. However, it does not quantitatively account for the effects of initial water content on compressive behavior of remolded and reconstituted clays and the initial water contents of clays are not always limited to 1.0 - 1.5 times the liquid limits defined by Burland. A modification based on collected tests data was presented on the expressions of ?and ?defined by Burland. Extensive oedometer test data were also collected on various remolded and reconstituted soils with distinct liquid limits and initial water contents to verify the validity of modified expressions. A normalized compression line deduced by intrinsic compression line is proposed in the e-log p plot, which can be used to evaluate the effects of soil structure quantitatively on the intact compressive behavior for natural sedimentary clays.

关键词： Initial Water Content Compression Behavior Remolded and Reconstituted Clays oedometer Test

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