Non-linearly Coupled Heat-Stress-Fluid Flow Behavior of Rock under Low Temperature.

采用冻结管垂直于岩石表面的矩形试件，在实验室进行了冻融试验。这项测试的目的是调查岩石中的热传导，目的是了解岩石通过温度变化而产生的变形。采用均匀连续介质假设对冻结管周围的温度分布进行了数值模拟。有限元计算程序由热-应力-流体流动的非线性耦合本构方程和弹塑性关系组成。将数值计算结果与实验结果进行了比较，得出了以下结论：1)冻结管周围岩石的变形行为主要是由于水的热膨胀和岩石材料的收缩两个过程；2)解冻条件对应变分布规律有明显的影响；3)岩石在热流方面表现为均匀的弹塑性连续体。

A freezing and thawing test has been conducted in a laboratory using a rectangular specimen with a freezing pipe perpendicular to the rock surface. The aim of the test is an investigation into the conduction of heat in a rock with the goal of understanding the deformation through temperature change. The temperature distributions around the freezing pipe were simulated numerically using homogenous continuum assumptions. 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, yielding the following conclusions.1) The deformation behavior of the rock around the freezing pipe is mainly due to two processes, 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.