Characterization of Boom Clay anisotropic THM behaviour based on two heating tests at different scales in the HADES URL

Guangjing Chen; Xiang Ling Li; Arnaud Dizier; Jan Verstricht; Xavier Sillen; Séverine Levasseur

doi:10.1144/SP536-2022-72

Characterization of Boom Clay anisotropic THM behaviour based on two heating tests at different scales in the HADES URL

Guangjing Chen, Xiang Ling Li, Arnaud Dizier, Jan Verstricht, Xavier Sillen, Séverine Levasseur

Research output › peer-review

Abstract

To examine the impact of the heat generated by high level radioactive waste on Boom Clay, two heater tests have been launched in the HADES underground research facility (URL): the small scale ATLAS Heater Test and the large scale PRACLAY Heater Test. The major objective of these tests is to confirm and refine the thermo-hydro-mechanical (THM) constitutive models and associated parameter values obtained from a laboratory characterisation programme. This paper presents the observations from the ATLAS and PRACLAY Heater Tests and the combined numerical modelling of these tests. To characterise the excavation damaged zone in the clay around these tests, a mechanical model with a strain dependent elastic modulus is introduced for the Boom Clay. The consistency between the observations from laboratory tests and in situ tests and the outcomes from the numerical models strengthens the confidence in our understanding of the THM behaviour of Boom Clay. It also enabled to validate the mechanical model and produce a set of anisotropic THM property values for both intact and damaged Boom Clay.

Original language	English
Article number	72
Number of pages	24
Journal	Geological Society, London, Special Publications
Volume	536
DOIs	https://doi.org/10.1144/SP536-2022-72
State	Published - 27 Feb 2023
Event	2022 - Exchange Meeting HADES40 - Dessel Duration: 9 Dec 2022 → 9 Dec 2022

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title = "Characterization of Boom Clay anisotropic THM behaviour based on two heating tests at different scales in the HADES URL",

abstract = "To examine the impact of the heat generated by high level radioactive waste on Boom Clay, two heater tests have been launched in the HADES underground research facility (URL): the small scale ATLAS Heater Test and the large scale PRACLAY Heater Test. The major objective of these tests is to confirm and refine the thermo-hydro-mechanical (THM) constitutive models and associated parameter values obtained from a laboratory characterisation programme. This paper presents the observations from the ATLAS and PRACLAY Heater Tests and the combined numerical modelling of these tests. To characterise the excavation damaged zone in the clay around these tests, a mechanical model with a strain dependent elastic modulus is introduced for the Boom Clay. The consistency between the observations from laboratory tests and in situ tests and the outcomes from the numerical models strengthens the confidence in our understanding of the THM behaviour of Boom Clay. It also enabled to validate the mechanical model and produce a set of anisotropic THM property values for both intact and damaged Boom Clay.",

keywords = "PRACLAY heater test, ATLAS",

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note = "Score=10; 2022 - Exchange Meeting HADES40 ; Conference date: 09-12-2022 Through 09-12-2022",

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AU - Chen, Guangjing

AU - Li, Xiang Ling

AU - Dizier, Arnaud

AU - Verstricht, Jan

AU - Sillen, Xavier

AU - Levasseur, Séverine

N1 - Score=10

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N2 - To examine the impact of the heat generated by high level radioactive waste on Boom Clay, two heater tests have been launched in the HADES underground research facility (URL): the small scale ATLAS Heater Test and the large scale PRACLAY Heater Test. The major objective of these tests is to confirm and refine the thermo-hydro-mechanical (THM) constitutive models and associated parameter values obtained from a laboratory characterisation programme. This paper presents the observations from the ATLAS and PRACLAY Heater Tests and the combined numerical modelling of these tests. To characterise the excavation damaged zone in the clay around these tests, a mechanical model with a strain dependent elastic modulus is introduced for the Boom Clay. The consistency between the observations from laboratory tests and in situ tests and the outcomes from the numerical models strengthens the confidence in our understanding of the THM behaviour of Boom Clay. It also enabled to validate the mechanical model and produce a set of anisotropic THM property values for both intact and damaged Boom Clay.

AB - To examine the impact of the heat generated by high level radioactive waste on Boom Clay, two heater tests have been launched in the HADES underground research facility (URL): the small scale ATLAS Heater Test and the large scale PRACLAY Heater Test. The major objective of these tests is to confirm and refine the thermo-hydro-mechanical (THM) constitutive models and associated parameter values obtained from a laboratory characterisation programme. This paper presents the observations from the ATLAS and PRACLAY Heater Tests and the combined numerical modelling of these tests. To characterise the excavation damaged zone in the clay around these tests, a mechanical model with a strain dependent elastic modulus is introduced for the Boom Clay. The consistency between the observations from laboratory tests and in situ tests and the outcomes from the numerical models strengthens the confidence in our understanding of the THM behaviour of Boom Clay. It also enabled to validate the mechanical model and produce a set of anisotropic THM property values for both intact and damaged Boom Clay.

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