›› 2013, Vol. 34 ›› Issue (S1): 430-436.

• Numerical Analysis • Previous Articles     Next Articles

2D distinct element analyses of thermo-hydro-mechanical coupling effects for a drift with bolt-shotcrete supporting in a conceptual nuclear waste repository

ZHANG Yu-jun，XU Gang   

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2012-05-15 Online:2013-08-30 Published:2014-06-09

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Abstract: It is assumed that a conceptual disposal repository for nuclear waste is located in a saturated jointed rock mass with certain water head, and a supporting system composed of rock bolts and shotcrete is installed after excavation of the drift. The construction of drift and a coupled thermo-hydro-mechanical(T-H-M) operation process of 50 years are simulated numerically by using UDEC code. The changes of stresses, displacements, plastic zones, temperatures, water flow in the rock mass of near field are analysed for cases with and without supporting; and the loading states of bolts and shotcrete are investigated under the conditions of coupling with different fields (temperature, water and stress). The results show: not only the rock bolts and shotcrete have the routine support function, but also are able to block free seepage of groundwater from the drift surface, so making plastic zone decrease, fracture pressure and temperature rise; compared with the case of action only by single stress field, the stability of surrounding rock mass is reduced, and the loading state of supporting structure is degenerated in the case of thermo-hydro-mechanical coupling.

Key words: conceptual nuclear waste repository, bolt-shotcrete supporting, thermo-hydro-mechanical(T-H-M) coupling, distinct element method, numerical analysis

CLC Number: 

  • X 771
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