寒区挡土墙温度场、渗流场和应力场耦合问题的非线性分析

NONLINEAR ANALYSES FOR RETAINING WALLS IN FRIGID ZONE-A COUPLED PROBLEM OF TEMPERATURE, SEEPAGE, AND STRESS FIELDS

根据传热学,渗流理论及冻土力学提出了带相变的温度场、渗流场和应力场耦合问题的数学力学模型及其控制方程。应用伽辽金法导出了这一问题的有限元计算公式。给出了一寒区挡土墙考虑渗流和冻胀时的温度场和应力场算例。算例表明渗流对寒区挡土墙周围的温度场影响很大,而冻胀力对寒区挡土墙的水平应力影响很大。

A model for the coupled problem of temperature, seepage, and stress fields is proposed in the paper. Then, the formulation of the problem is performed by Galerkin method. An example is presented to show the whole process. The example shows that the effect of seepage field on the temperature field of retaining walls is large; the influence of frost-heaving force on the stresses of retaining walls is very large. The effects of these factors on retaining walls in frigid zone should be taken into account in the engineering design. In comparison of the results with that of the measured one, the agreement is seen to be very good.