Hydro-mechanical Coupled Creep Behaviour of Boom Clay: Numerical Investigations and 30 Years in Situ Measurements
By: Weizhong Chen (author), H. D. Yu (author), X. Sillen (author), X. L. Li (author)Hardback
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Creep behaviour, especially for underground radioactive waste disposal facilities, whose storage period far exceed the service time of most of the civil engineering underground facilities, is very significant. Boom Clay, an argillaceous rock chosen as a reasonable geological barrier in Belgium is first systematically studied in this book. A series of research tools such as laboratory experiments (4 years), field measurements (20 years), theoretical studies, back analysis and numerical simulations are used to study the mechanical behavior of this rock. Firstly, laboratory studies such as oedometer tests, HM triaxial tests, HM triaxial creep tests and SEM tests, etc. intuitively show the nonlinear behaviour of the argillaceous rock and it provides a basis for the theoretical studies. Secondly, considering the anisotropic mechanical properties and nonlinear creep potential of Boom Clay, a relatively complete theoretical system has been established. Thirdly, based on the field measurements in the last few decades, using back analysis method, the theoretical studies are verified.
Finally, based on the study above, long term stability analysis of the underground disposal facilities is implemented and the risks facing future generations in the event of failure in the disposal system are also quantified through numerical simulation.
1 Introduction 1.1 Context 1.2 Objectives-outline 2 Laboratory tests on HM behavior of Boom clay 2.1 Introduction of HM tests on Boom clay 2.2 Experimental preparation 2.3 Experimental procedures 2.4 Experimental results 2.5 Microstructure analysis for Boom clay 3 Elasto-plastic damage model of Boom clay 3.1 Transversely isotropic feature of Boom clay 3.2 Modified Mohr-Coulomb model and its secondary development 3.3 Elasto-plastic damage theory 3.4 Parameter determination for elasto-plastic damage model 4 Mechanical creep damage model of Boom clay 4.1 Creep mechanism of Boom clay 4.2 Oedometric creep model 4.3 Nonlinear creep damage constitutive model 5 Back analysis on in-situ stress of HADES 5.1 Back analysis model for in-situ stress for HADES 5.2 Numerical implementation by FEM 5.3 Back analysis on in-situ stress by lining measurements 5.4 Back analysis on in situ stress field by hydraulic fracturing tests 6 Back analysis on anisotropic permeability of HADES 6.1 Permeability properties in EdZ of Boom clay 6.2 Permeability distribution model for hydraulic disturbed zone 6.3 Permeability self-sealing model for Boom clay 6.4 Back analysis on permeability of Boom clay 6.5 Comparison of numerical results and field measurements 7 Back analysis on creep behavior of Boom clay 7.1 Creep damage constitutive model of lining 7.2 Creep damage finite element equation and programming 7.3 In situ creep behaviour of Boom clay 7.4 Back analysis creep behaviour of Boom clay 7.5 Creep behaviour prediction of Test Drift in 100 years 8 HM perturbation during the connecting gallery construction (CLIPEX) 8.1 CLIPEX project 8.2 Numerical simulation 8.3 Comparison between field measurements and numerical result 9 Numerical simulation on long-term stability of HADES 9.1 Brief introduction of HADES 9.2 Long-term in situ measurements 9.3 Finite element model of HADES 9.4 Calculation conditions 9.5 Numerical results 10 Conclusions References
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- ID: 9780415656436
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