TY - JOUR
T1 - Thermal Impact on Damaged Boom Clay and Opalinus Clay: Permeameter and Isostatic Tests with μCT Scanning
T2 - Special Issue: Thermo-Hydro-Mechanical Effects in Clay Host Rocks for Radioactive Waste Repositories
AU - Chen, Guangjing
AU - Maes, Tom
AU - Vandervoort, Frank
AU - Sillen, Xavier
AU - Van Marcke, Philippe
AU - Honty, Miroslav
AU - Dierick, M.
AU - Vanderniepen, P.
N1 - Score = 10
PY - 2014/1
Y1 - 2014/1
N2 - Within the framework of the TIMODAZ project, permeameter tests and isostatic tests were performed on Boom Clay and Opalinus Clay in order to assess the impact of temperature, pore water composition, and confining stress on the sealing of damaged samples of Boom Clay and Opalinus Clay. A microfocus X-ray computed tomography technique was used to visualize the evolution of the sealing process. Compared to the fast sealing of Boom Clay, the sealing of Opalinus Clay was much slower. The heating showed a significant, favorable impact on the sealing behavior of Opalinus Clay under permeameter test conditions, while the sealing behavior of Boom Clay appeared to be unaffected. Tests performed under isostatic conditions did not reveal a significant influence of a heating–cooling cycle on the sealing behavior of these clays. The reappearance of the fractures or holes in the samples after dismantling confirms earlier observations which showed that after sealing, the original mechanical properties are not recovered. In other words, a heating cycle does not seem to induce healing.
AB - Within the framework of the TIMODAZ project, permeameter tests and isostatic tests were performed on Boom Clay and Opalinus Clay in order to assess the impact of temperature, pore water composition, and confining stress on the sealing of damaged samples of Boom Clay and Opalinus Clay. A microfocus X-ray computed tomography technique was used to visualize the evolution of the sealing process. Compared to the fast sealing of Boom Clay, the sealing of Opalinus Clay was much slower. The heating showed a significant, favorable impact on the sealing behavior of Opalinus Clay under permeameter test conditions, while the sealing behavior of Boom Clay appeared to be unaffected. Tests performed under isostatic conditions did not reveal a significant influence of a heating–cooling cycle on the sealing behavior of these clays. The reappearance of the fractures or holes in the samples after dismantling confirms earlier observations which showed that after sealing, the original mechanical properties are not recovered. In other words, a heating cycle does not seem to induce healing.
KW - TIMODAZ
KW - Boom Clay
KW - Opalinus Clay
KW - temperature
KW - pore water composition
KW - stress
KW - sealing
KW - fractures
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/ezp_133556
UR - http://knowledgecentre.sckcen.be/so2/bibref/11118
U2 - 10.1007-y/s00603-012-0334-y
DO - 10.1007-y/s00603-012-0334-y
M3 - Article
SN - 0723-2632
VL - 47
SP - 87
EP - 99
JO - Rock Mechanics and Rock Engineering
JF - Rock Mechanics and Rock Engineering
IS - 1
ER -