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Anisotropic modelling of opalinus clay behaviour: From triaxial tests to gallery excavation application

Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 53-66页

作者： Francois Bertrand Frédéric Collin Université de Liège Département ArGEnCo/Géomécanique Allée de la découverte 9 4000 Liège Belgium F.R.I.A Fonds de la Recherche Scientifique e FNRS Brussels Belgium

Deep repository in geological formations is the preferential solution considered in many countries to manage high-level nuclear wastes. In Switzerland, the opalinus clay is a candidate host rock. In this context, in situ and laboratory tests are conducted on opalinus clay to demonstrate the feasibility of deep disposal in this argillaceous formation. This paper presents a constitutive model able to fit the experimental data obtained from some triaxial tests conducted by Jahns(2013) on cores from borehole Schlattingen SLA-1. The elasto-plastic behaviour of opalinus clay is reproduced thanks to a DruckerPrager model, taking into account the anisotropy behaviour of this sedimentary rock. The objective is to employ a single set of parameters representative of the material. In a second version of the model, the stress-dependence of the elastic properties and damage are taken into account. Finally, the parameters calibrated with experimental tests are used to simulate the excavation of a gallery with a second gradient approach.

关键词： opalinus clay Schlattingen Constitutive modelling Anisotropy Dilatancy Localisation Tunnel excavation

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A multi-stage triaxial testing procedure for low permeable geomaterials applied to opalinus clay

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第3期9卷 137-148页

作者： Katrin M. Wild Marco Barla Giovanni Turinetti Florian Amann Engineering Geology Group Geological Institute ETH Zürich Sonneggstrasse 5 Zürich 8092 Switzerland Department of Structural Building and Geotechnical Engineering Politecnico di Torino Corso Duca degli Abruzzi 24 Torino 10129 Italy Swiss Competence Center of Energy Research Supply of Electricity (SCCER-SoE) Geological Institute ETH Zürich Sonneggstrasse 5 Zürich 8092Switzerland

In many engineering applications,it is important to determine both effective rock properties and the rock behavior which are representative for the problem’s in situ *** this purpose,rock samples are usually extracted from the ground and brought to the laboratory to perform laboratory experiments such as consolidated undrained(CU)triaxial *** low permeable geomaterials such as clay shales,core extraction,handling,storage,and specimen preparation can lead to a reduction in the degree of saturation and the effective stress state in the specimen prior to testing remains *** changes in structure and the effect of capillary pressure can alter the properties of the specimen and affect the reliability of the test results.A careful testing procedure including back-saturation,consolidation and adequate shearing of the specimen,however,can overcome these *** substantial effort has been devoted during the past decades to the establishment of a testing procedure for low permeable geomaterials,no consistent protocol can be *** a special focus on CU tests on opalinus clay,this study gives a review of the theoretical concepts necessary for planning and validating the results during the individual testing stages(saturation,consolidation,and shearing).The discussed tests protocol is further applied to a series of specimens of opalinus clay to illustrate its applicability and highlight the key aspects.

关键词： Triaxial test Saturation Consolidation Undrained opalinus clay clay shale

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滤膜效应对测定扩散参数的影响

滤膜效应对测定扩散参数的影响

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“创新——核科学技术发展的不竭源泉”——中国核学会2009年学术年会

作者：伍涛李金英浙江省湖州师范学院生命科学院中国核工业总公司综合计划处

研究了强吸附性核素Np(V)在Mont Terri地下实验室的opalinus clay(OPA)中的扩散行为。实验方法采用了内扩散(In-diffusion)和打磨技术相结合的方法,并用自编扩散模型分析程序分析Np(V)在OPA中的扩散实验结果,从而测得扩散参数,如有效扩... 详细信息

研究了强吸附性核素Np(V)在Mont Terri地下实验室的opalinus clay(OPA)中的扩散行为。实验方法采用了内扩散(In-diffusion)和打磨技术相结合的方法,并用自编扩散模型分析程序分析Np(V)在OPA中的扩散实验结果,从而测得扩散参数,如有效扩散系数D,分配系数K和岩石容量因子α。实验过程中为了防止OPA的膨胀使用了不锈钢滤膜,因此有必要考虑滤膜效应对测得的扩散参数的影响。该分析程序引入237Np(V)在不锈钢滤膜中的有效扩散系数D。由实验结果可知,有必要考虑滤膜效应。当缺乏核素在滤膜中的有效扩散系数时,可用Stokes-Einstein公式计算得出,可满足研究核素迁移过程中实验装置和实验条件的设计。

关键词：滤膜效应扩散 237Np(Ⅴ) opalinus clay

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