›› 2011, Vol. 32 ›› Issue (12): 3743-3750.

• Numerical Analysis • Previous Articles     Next Articles

Finite element analyses of effects of fracture continuity rate on thermo-hydro-mechanical coupling in dual-porosity medium

ZHANG Yu-jun1, ZHANG Wei-qing2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2010-08-19 Online:2011-12-10 Published:2011-12-13

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Abstract: In order to probe into the effects of fracture continuity rate on coupled temperature field, seepage field and stress field, using the coupled thermo-hydro-mechanical model of dual-porosity medium for ubiquitous-joint rock mass established by the authors and taking a hypothetical nuclear waste repository located in an unsaturated stratum as a calculation example, the two-dimensional finite element analyses were carried out for four cases in which the continuity rates of fracture and pore are different; and the temperatures, negitive pore and fracture water pressures, flow velocities of groundwater, permeability correction factors for pore and fracture and stresses in the surrounding rock mass were investigated in the numerical simulation. The results show that the stiffness of dual-porosity medium is changed because of using different fracture continuity rates; so the state and level of stresses in the rock mass are modified, and then the porosity and permeability of pore and fracture are altered; therefore the variations of values, distributions of pore and fracture pressures as well as water flow velocities are caused.

Key words: fracture continuity rate, dual-porosity medium, thermo-hydro-mechanical coupling, finite element analysis

CLC Number: 

  • O 242.21
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