NUMERICAL STUDY OF LONG-TERM THM COUPLING BEHAVIOR OF ARGILLITE FILLING WITH SWELLING CLAY

摘要

To investigate the long-term thermo-hydro-mechanical coupling behavior of the host rock filling with barrier materials near nuclear waste cans, a numerical model is employed to study the variation of deformation, temperature and pore pressure in the rock mass with time up to 10,000 years. The simulation process includes excavation, backfill and heating of the swelling clay and host rock. The curve of temperature variation of clay is used to simulate the corruption of waste can. Based on the study of variation of pore pressure, displacement and temperature at different point in the host rock along radial direction, the maximum disturbed extent of host rock due to the temperature variation of swelling clay is discussed. The whole process of the tHM response of the host rock up to 10,000 year is also simulated in this research. It shows that the temperature and pore pressure of the rock mass will increase at the beginning and the then decrease. When time goes up to 10,000year, the pore pressure of the rock mass go back to its original state, but the temperature and deformation will not restore its original state.