Finite element analysis on coupled stress and fluid flow behavior of rock-like porous material caused by low temperature source.

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A freezing and thawing triaxial compression test has been conducted in a laboratory using a cylindrical specimen. The aim of the test is an investigation into the deformation and strength characteristics of sand stone with the goal of understanding the deformation through temperature change. The numerical procedures by finite element method is composed of non-linearly coupled heat-stress-fluid flow constitutive equations and elasto-plastic relations. The numerical results were compared with the experimental results and also slope stability problem, yielding the following conclusions.1) The deformation behavior of the rock is mainly due to two processes. That is the thermal expansion of water and contraction of rock materials ;2) The thawing conditions have a clear effect on the patterns of strain distributions ; and3) The rock behaves as a homogeneous elasto-plastic continuum with respect to heat flow.