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岩石力学与工程学报 2006年第4期25卷 721-732页

作者： delage pierre CERMES-I. Navier法国国立路桥大学

近 10 a 来,用于高放废物工程屏障的高压实膨胀黏土的性状受到了广泛关注。据此通过吸力控制试验获取了一些高压实膨润土的试验数据,并从微观结构特性角度进行了解释。水分滞留和迁移特性,以及吸力变化下的膨胀反应都与微观机理相关,同... 详细信息

近 10 a 来,用于高放废物工程屏障的高压实膨胀黏土的性状受到了广泛关注。据此通过吸力控制试验获取了一些高压实膨润土的试验数据,并从微观结构特性角度进行了解释。水分滞留和迁移特性,以及吸力变化下的膨胀反应都与微观机理相关,同时对吸附阳离子的作用也进行了评价。

关键词：工程屏障膨胀性黏士微观结构核废物吸力

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Microstructure and anisotropic swelling behaviour of compacted bentonite/sand mixture

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Journal of Rock Mechanics and Geotechnical Engineering 2014年第2期6卷 126-132页

作者： Simona Saba Jean-Dominique Barnichon Yu-Jun Cui Anh Minh Tang pierre delage Ecole des Ponts ParisTech Laboratoire Navier Institut de Radioprotection et de Surete Nucleaire(IRSN)

Pre-compacted elements （disks, tutus） of bentonite/sand mixture are candidate materials for sealing plugs of radioactive waste disposal. Choice of this material is mainly based on its swelling capacity allowing all gaps in the system to be sealed, and on its low permeability. When emplaced in the gallery, these elements will start to absorb water from the host rock and swell. Thereby, a swelling pressure will develop in the radial direction against the host rock and in the axial direction against the support structure. In this work, the swelling pressure of a small scale compacted disk of bentonite and sand was experimentally studied in both radial and axial directions. Different swelling kinetics were identified for different dry densities and along different directions. As a rule, the swelling pressure starts increasing quickly, reaches a peak value, decreases a little and finally stabilises. For some dry densities, higher peaks were observed in the radial direction than in the axial direction. The presence of peaks is related to the microstructure change and to the collapse of macro- pores. In parallel to the mechanical tests, microstructure investigation at the sample scale was conducted using microfocus X-ray computed tomography （BCT）. Image observation showed a denser structure in the centre and a looser one in the border, which was also confirmed by image analysis. This structure heterogeneity in the radial direction and the occurrence of macro-pores close to the radial boundary of the sample can explain the large peaks observed in the radial swelling pressure evolution. Another interesting result is the higher anisotropy found at lower bentonite dry densities, which was also analysed by means ofμCT observation of a sample at low bentonite dry density after the end of test. It was found that the macro-pores, especially those between sand grains, were not filled by swelled bentonite, which preserved the anisotropic microstructure caused by uniaxial compression

关键词： Bentonite/sand mixture Nuclear waste disposal Anisotropy Swelling pressure Microstructure Microfocus X-ray computed tomography(μCT)

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

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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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多相介质油田白垩的试验研究

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同济大学学报（自然科学版） 2002年第1期30卷 23-26页

作者：陈宝杨林德崔玉军 pierre delage 同济大学地下建筑与工程系上海200092 法国路桥大学土力学教育与研究中心

为了合理解释北海白垩油田遭遇的钻井失稳及地表沉降等问题 ,深入了解油田白垩的特殊性态 ,在试验研究的基础上对多相介质油田白垩的非饱和特性进行了研究 .试验结果证实了非饱和白垩具有与一般非饱和土相似的性态 ,包括水饱和度与虹吸... 详细信息

为了合理解释北海白垩油田遭遇的钻井失稳及地表沉降等问题 ,深入了解油田白垩的特殊性态 ,在试验研究的基础上对多相介质油田白垩的非饱和特性进行了研究 .试验结果证实了非饱和白垩具有与一般非饱和土相似的性态 ,包括水饱和度与虹吸力的关系 ,适用于非饱和白垩的应力状态变量 ,具有强度和压缩性随吸力的变化而变化的特性等 .所获成果可为油田白垩的模型研究提供参考依据 ,并对解决在石油开采过程所遇到的工程问题具有指导意义 .

关键词：白垩非饱和土虹吸力室内试验岩土材料水饱和度强度油田

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