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

在实验室中进行了矩形试样的冻融试验，冻结管垂直于岩石表面。该试验的目的是研究岩石中的热传导，目的是了解温度变化引起的变形。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。有限元法的数值计算程序由热-应力-流体非线性耦合的本构方程和弹塑性关系组成。通过与试验结果的比较，得出以下结论：1）冻结管周围岩石的变形主要是由水的热膨胀和岩石材料的收缩两个过程引起的：2）解冻条件对应变分布有明显的影响;岩石在热流作用下表现为均匀弹塑性连续体。

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.