Effects of inherent spatial variability of rock properties on the thermo-hydro-mechanical responses of a high-level radioactive waste repository

Plúa, C.; Vu, Minh‐Ngoc; Seyedi, Darius; Armand, Gilles

doi:10.1016/j.ijrmms.2021.104682

Cited by 26 publications

(6 citation statements)

References 21 publications

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“…It has been shown that the COx claystone is transversely isotropic (Plúa et al, 2021b), therefore a simplified set of coefficients is presented (the properties along the directions x and y are identical, denoted in the following with a subscript h). Like in most claystones, this plane of isotropy corresponds to the bedding plane.…”

Section: Transversely Isotropic Thermo-porolastic Frameworkmentioning

confidence: 99%

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Inducing Tensile Failure of Claystone Through Thermal Pressurization in a Novel Triaxial Device

et al. 2022

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Highlights-Thermal pressurization of clay rock in deep radioactive waste repositories can reduce the effective stresses, which can lead to damage or failure. -Our novel laboratory triaxial device is able mimic in situ conditions: Constant vertical total stress, zero lateral deformation and thermal pressurization. -Pore pressure increase, vertical extension strains and thermal pressurization failure were recorded in a series of tests on Callovo-Oxfordian claystone specimens. -The effective tensile strength was reached at values around 3 MPa in tension and temperatures between 53 and 64 °C, creating sub-horizontal fractures. -The experimental responses can be well reproduced using a thermo-poroelasticity model.-Hoek-Brown and Fairhurst generalized Griffith criteria appear suitable to account for the rock's tensile resistance.

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Section: Transversely Isotropic Thermo-porolastic Frameworkmentioning

confidence: 99%

“…Also a better fitting of the horizontal elastic properties E h and ν zh , on which literature data is scarce, could provide better results. For further information on the in situ variability of parameters, the reader is referred to Plúa et al (2021b).…”

Section: Simulation Of Thermal Pressurization In Pseudo-undrained Con...mentioning

confidence: 99%

Inducing Tensile Failure of Claystone Through Thermal Pressurization in a Novel Triaxial Device

et al. 2022

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“…In recent years, under the dual pressure of energy and environment, vigorously developing clean energy has become the consensus of all countries in the world; hence, underground coal gasification, , heavy oil thermal recovery, geothermal resource development, storage of nuclear waste, and other clean projects have become the focus of research. However, all of these projects will be affected by high temperature; due to the different properties and structures of various minerals in the rock, cracks will appear between and inside rock mineral particles under the action of high temperature, resulting in the destruction of the rock pore structure. − This will affect not only the mechanical properties but also the seepage and transmission capacity of rocks. − In order to ensure the smooth progress of underground engineering, understanding the pore structure change law of limestone under a high temperature has become increasingly important.…”

Section: Introductionmentioning

confidence: 99%

Pore Structure Evolution and Failure Mechanism of Limestone in the Taiyuan Formation of the Ordos Basin under High Temperature

Kong,

Yin,

Chen

et al. 2024

ACS Omega

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The study on the destruction of the limestone microstructure after hightemperature treatment has a significant value in the airtightness and safety of underground high-temperature geotechnical engineering. In order to truly simulate the influence of the underground high-temperature environment on limestone, taking seven groups of limestones of the Taiyuan Formation in the Ordos Basin as examples, we carried out a high-temperature (25−1200 °C) heating experiment of limestone in an argon atmosphere. The pore structure of limestone after the high temperature is studied based on scanning electron microscopy (SEM), mercury intrusion porosimetry (MIP), porosity, and permeability, and the change in the fractal dimension of the limestone pore structure was discussed based on the thermodynamic fractal theory, combined with X-ray diffraction (XRD) and thermogravimetry differential scanning calorimetry (TG-DSC), the variation of mineral composition with temperature is characterized, and the evolution mechanism of the limestone microstructure under high temperature is discussed. The results show that the evaporation of pore water does not destroy the lattice structure of limestone minerals; however, with the increase of temperature, the complete decomposition of dolomite and calcite occurs, along with the tensile fracture of calcite crystals under the effect of swelling stress. Moreover, the new minerals generated by the decomposition products under the effect of temperature severely damage the crystal structure, leading to the rapid increase of porosity and permeability. The comprehensive results show that the decomposition, expansion, and recrystallization of calcite and dolomite minerals after 800 °C led to the development of limestone macropores and fissures, increased the pore throat radius, enhanced the pore connectivity, simplified the pore structure, and sharply increased the permeability; thus, 800 °C can be used as the critical temperature to change the limestone pores and fractures. The research results can provide data support for subsurface high-temperature geotechnical engineering.

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“…Rock mechanical properties and constitutive models are the core of rock mechanics research and they play an important role in rock engineering excavation and support design (Plúa et al., 2021; Tao et al., 2022; Xing et al., 2018). Underground engineering excavation will change the stress state of the surrounding rock, causing rock damage and then changing the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

A new statistical damage model for true triaxial pre-and post-peak behaviors of rock considering intermediate principal stress and initial compaction effects

Zheng

et al. 2022

International Journal of Damage Mechanics

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Deep underground engineering excavation will induce complex change in the true three-dimensional stress state of the surrounding rock, causing rock damage and then leading to a change in mechanical properties. In this research, the true triaxial compression tests are conducted to study the influence of σ2 and σ3 on the mechanical properties of marble, such as the characteristic strength (crack initiation stress σci, damage stress σcd, peak strength σp, and residual strength σr), post-peak deformation, ductility and brittleness. The peak strength σp, crack initiation stress σci and damage stress σcd of rock increase with the increase in σ2, while the variation of residual strength σr with σ2 is different from that of peak strength. As σ2 increases or σ3 decreases, the pre-peak plasticity of the rock decreases, the post-peak curve shape of the rock changes significantly, and the overall shape of the post-peak curve transforms from Class I to Class II. The Mogi-Coulomb strength criterion with intermediate principal stress effect was used to characterize the rock microelement strength, and then the new statistical damage constitutive model considering the initial compaction effect and damage threshold was proposed, and the model validation was carried out based on the experimental results and the effects of the proposed model parameters m and F0 on the rock strength and post-peak curve morphology were further explored.

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Effects of inherent spatial variability of rock properties on the thermo-hydro-mechanical responses of a high-level radioactive waste repository

Cited by 26 publications

References 21 publications

Inducing Tensile Failure of Claystone Through Thermal Pressurization in a Novel Triaxial Device

Inducing Tensile Failure of Claystone Through Thermal Pressurization in a Novel Triaxial Device

Pore Structure Evolution and Failure Mechanism of Limestone in the Taiyuan Formation of the Ordos Basin under High Temperature

A new statistical damage model for true triaxial pre-and post-peak behaviors of rock considering intermediate principal stress and initial compaction effects

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