›› 2012, Vol. 33 ›› Issue (11): 3426-3432.

• Numerical Analysis • Previous Articles     Next Articles

Finite element analysis of influence of fracture stiffness changing with stress on thermo-hydro-mechanical coupling in dual-porosity medium

ZHANG Yu-jun，XU Gang，YANG Chao-shuai   

  1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
  • Received:2011-10-24 Online:2012-11-12 Published:2012-11-14

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Abstract: Introducing and modifying the continuously yielding joint model, and simultaneously considering the composite impact of mechanical dilation/compaction and pressure solution on fracture aperture, the FEM code for analysis of the thermo-hydro- mechanical coupling in dual-porosity medium established by the first author was improved. Through the numerical simulations in which there were two patterns of changing the fracture stiffness for a hypothetical nuclear waste repository, the variations and distributions of temperatures, fracture stiffnesses, normal stresses, pore (fracture) pressures, flow velocities of groundwater were investigated. The results show: compared with the case of unchangeable fracture stiffness, the temperatures in the computing domain are lower in the case whose fracture stiffness is an exponential function of normal stress; the magnitudes of stresses within the rock mass in two cases are also some different, but the characteristics of stress distribution are similar to those of fracture stiffnesses obviously; and the negative pore (fracture) pressures in the case with changeable fracture stiffness are smallish (about 98% of case of unchangeable fracture stiffness).

Key words: dual-porosity medium, continuously yielding joint model, thermo-hydro-mechanical coupling, finite element analysis

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  • O 242
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