simulation of coupled thm process in surrounding rock mass of nuclear waste repository in argillaceous formation
来源期刊：中南大学学报(英文版)2015年第2期
论文作者：JIANG Zhong-ming(蒋中明) HOXHA Dashnor HOMAND Fran？oise CHEN Yong-gui(陈永贵)
文章页码：631 - 637
Key words：argillaceous formation; thermo-hydro-mechanical (THM) process; in-situ test
Abstract: To investigate and analyze the thermo-hydro-mechanical (THM) coupling phenomena of a surrounding rock mass in an argillaceous formation, a nuclear waste disposal concept in drifts was represented physically in an in-situ test way. A transversely isotropic model was employed to reproduce the whole test process numerically. Parameters of the rock mass were determined by laboratory and in-situ experiments. Based on the numerical simulation results and in-situ test data, the variation processes of pore water pressure, temperature and deformation of surrounding rock were analyzed. Both the measured data and numerical results reveal that the thermal perturbation is the principal driving force which leads to the variation of pore water pressure and deformations in the surrounding rock. The temperature, pore pressure and deformation of rock mass change rapidly at each initial heating stage with a constant heating power. The temperature field near the heater borehole is relatively steady in the subsequent stages of the heating phase. However, the pore pressure and deformation fields decrease gradually with temperature remaining unchanged condition. It also shows that a transversely isotropic model can reproduce the THM coupling effects generating in the near-field of a nuclear waste repository in an argillaceous formation.
JIANG Zhong-ming(蒋中明)1, 2, HOXHA Dashnor2, HOMAND Fran？oise2, CHEN Yong-gui(陈永贵)3
(1. School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha 410004, China;
2. Laboratory of Environment Geotechnical Engineering, National Superior School of Geology, Nancy 54501, France;
3. Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China)
Abstract:To investigate and analyze the thermo-hydro-mechanical (THM) coupling phenomena of a surrounding rock mass in an argillaceous formation, a nuclear waste disposal concept in drifts was represented physically in an in-situ test way. A transversely isotropic model was employed to reproduce the whole test process numerically. Parameters of the rock mass were determined by laboratory and in-situ experiments. Based on the numerical simulation results and in-situ test data, the variation processes of pore water pressure, temperature and deformation of surrounding rock were analyzed. Both the measured data and numerical results reveal that the thermal perturbation is the principal driving force which leads to the variation of pore water pressure and deformations in the surrounding rock. The temperature, pore pressure and deformation of rock mass change rapidly at each initial heating stage with a constant heating power. The temperature field near the heater borehole is relatively steady in the subsequent stages of the heating phase. However, the pore pressure and deformation fields decrease gradually with temperature remaining unchanged condition. It also shows that a transversely isotropic model can reproduce the THM coupling effects generating in the near-field of a nuclear waste repository in an argillaceous formation.
Key words:argillaceous formation; thermo-hydro-mechanical (THM) process; in-situ test
