Thermomechanical properties of deep argillaceous formations

Olmo, Carlos del; Fioravante, Vincenzo; Gera, F.; Hueckel, Tomasz; Mayor, Juan Carlos; Pellegrini, R.

doi:10.1016/0013-7952(95)00048-8

Cited by 67 publications

(20 citation statements)

References 8 publications

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“…These data (Figure 12) complement the permeability data ( Figure 11) and suggest that a general contraction of the bentonite may be occurring. Other studies have investigated the effect of consolidation on saturated soils, finding that low over-consolidation causes contraction whilst high over-consolidation causes expansion up to a specific temperature, followed by contraction for temperatures above this point (fractionated illitic material and glacial lake clay, normally consolidated [50]; low porosity clay [51], MC clay (similar to Kaolin) and bentonite [52]; Boom Clay, Pasquasia Clay and Spanish Clay [53]; Boom Clay [54]; Kaolin [55]). The thermal history of the bentonite in a repository could therefore have an important effect on its operational performance.…”

Section: Discussionmentioning

confidence: 99%

Bentonite Permeability at Elevated Temperature

et al. 2017

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Repository designs frequently favour geological disposal of radioactive waste with a backfill material occupying void space around the waste. The backfill material must tolerate the high temperatures produced by decaying radioactive waste to prevent its failure or degradation, leading to increased hydraulic conductivity and reduced sealing performance. The results of four experiments investigating the effect of temperature on the permeability of a bentonite backfill are presented. Bentonite is a clay commonly proposed as the backfill in repository designs because of its high swelling capacity and very low permeability. The experiments were conducted in two sets of purpose-built, temperature controlled apparatus, designed to simulate isotropic pressure and constant volume conditions within the testing range of 4-6 MPa average effective stress. The response of bentonite during thermal loading at temperatures up to 200 • C was investigated, extending the previously considered temperature range. The results provide details of bentonite's intrinsic permeability, total stress, swelling pressure and porewater pressure during thermal cycles. We find that bentonite's hydraulic properties are sensitive to thermal loading and the type of imposed boundary condition. However, the permeability change is not large and can mostly be accounted for by water viscosity changes. Thus, under 150 • C, temperature has a minimal impact on bentonite's hydraulic permeability.

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Section: Discussionmentioning

confidence: 99%

Bentonite Permeability at Elevated Temperature

et al. 2017

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“…The curves in Figure 10 show the function lðs; TÞ which results from the above assumptions, relations (6) and (17), for the already introduced material parameter values. Clearly, this modification affects the evolution of the consolidation pressure.…”

Section: Temperature Effects On Partially Saturated Soilsmentioning

confidence: 98%

Thermal effects in partially saturated soils: a constitutive model

Bolzon

Schrefler

2005

Num Anal Meth Geomechanics

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The present paper is centred on the assessment of an elastic–plastic model for partially saturated soils, earlier proposed by the authors, for its predictive capability with respect to temperature changes, on the light of available experimental results. The model is cast within a constitutive framework that uses Bishop’s stress and suction as main variables governing the volumetric response of the material. Some enhancement to the original temperature-independent formulation is proposed. In particular, functions describing the yield surface and the compressibility modulus are modified to account for the shrinking of the elastic domain and for the increase of irreversible volumetric strain with heating. Some examples illustrate the main features of the present proposal. Comparison with some experimental results is also included

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“…Hueckel et al concluded that the dependence of shear strength on temperature may be material‐specific. In addition, it should also be pointed out that the differences of M g values may be induced by the sample inhomogeneity , specimen preparation process such as an inappropriate resaturation process, which may alter the thermo‐hydro‐mechanical behavior , the thermomechanical loading history, and the drainage conditions under which the heating is performed.…”

Section: Model Description In Triaxial Conditionsmentioning

confidence: 99%

A two‐surface thermomechanical model for saturated clays

Hong

Pereira

Cui

2015

Num Anal Meth Geomechanics

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SUMMARYThis paper presents an advanced thermo-mechanical model -TEAM in the framework of twosurface plasticity for saturated clays, with emphasis put on some important thermomechanical features of natural clays evidenced experimentally such as the limited thermomechanical elastic zone, the smooth transition from elastic to plastic behavior. Two plastic mechanisms are introduced in the model: one is to reproduce the thermo-plasticity involving thermal expansion and contraction observed at high over-consolidation ratios and the second

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Thermomechanical properties of deep argillaceous formations

Cited by 67 publications

References 8 publications

Bentonite Permeability at Elevated Temperature

Bentonite Permeability at Elevated Temperature

Thermal effects in partially saturated soils: a constitutive model

A two‐surface thermomechanical model for saturated clays

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