Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (9): 3625-3634.doi: 10.16285/j.rsm.2018.1079

• Numerical Analysis • Previous Articles     Next Articles

Thermo-hydro-mechanical coupling simulation method of surrounding rock in high-level radioactive waste repository considering effective meso-thermal parameters

HOU Hui-ming1, 2, HU Da-wei1, 2, ZHOU Hui1, 2, LU Jing-jing1, 2, LÜ Tao3, ZHANG Fan4   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. China Nuclear Power Engineering Co., Ltd., Beijing 100840, China; 4. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, Hubei 430064, China
  • Received:2018-06-21 Online:2019-09-10 Published:2019-09-08
  • Supported by:
    This work was supported by the National Key R & D Program of China(2018YFC0809601), the National Natural Science Foundation of China (51779252) and the Major Projects of Technical Innovation in Hubei (2017AAA128).

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Abstract: The sustained releasing heat of spent fuel has important impacts on the mechanical and seepage fields of the surrounding rock in high-level waste disposal repositories and its long-term stability. Generally, the thermal parameters of surrounding rock depend on the mineral composition, porosity and pore fluid of rock. To the multi-field coupling analysis of high-level radioactive waste geological repository, it is necessary to determine the values of thermal parameters accurately. Through the meso-mechanical analysis, the method was established to obtain the effective thermal parameters of the surrounding rock, including heat capacity, thermal conductivity coefficient, and thermal expansion coefficient. Based on Biot theory for porous media, a thermo- hydro-mechanical coupling model was built, and then its numerical simulation method of surrounding rock in the high-level radioactive waste repository was proposed. Finally, through the multi-field coupling software of COMSOL Multiphysics, the proposed numerical simulation method was verified using the in-situ test data of thermo-hydro-mechanical coupling in surrounding rock in the Mont Terri high-level waste underground laboratory in Switzerland. The simulation results agreed well with the experimental results. The evolution law of the thermo-hydro-mechanical coupling process was also discussed. The research results can provide a scientific basis for the safety assessment and site selection of high-level radioactive waste repository in China.

Key words: multiphysics coupling, high-level radioactive waste, thermal parameters, meso-mechanics

CLC Number: 

  • TU 452
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