高寒地区涵洞路基多场耦合的非线性分析

The Non-Linear Analysis of Roadbed Multi-Field Coupling at the High and Cold Area in the West China

研究目的:为保证高寒地区路基的稳定性,本文运用渗流理论、传热学及冻土力学理论,建立温度场、渗流场耦合问题的分析模型及控制方程,采用伽辽金法推导出该问题的三维有限元分析计算模式。结合工程实例,用本文的方法对暖季涵洞过水情况下渗流对涵洞及路基温度场的影响进行数值计算,从而研究渗流对涵洞及涵洞路基稳定性的影响,对保证路基的稳定性及安全性有着重要的意义。研究结论:通过研究得出:(1)渗流对涵洞及设有涵洞的路基温度场的影响较大,渗流对涵洞中心的影响稍大于对涵洞两侧的影响,并会加深路基土的季节融化深度;(2)在渗流区,路基冻胀范围和冻胀程度会变大,在一定程度上会影响路基的安全性;(3)本研究成果对科研及设计人员认识路基温度场特性及渗流对路基稳定的影响具有指导意义,可对高寒地区工程建设提供一定的理论依据。

Research purposes： We build the analyzing model as well as the controlling process for the temperature field and seepage coupling, based on the seepage theory, heat diffusion and the mechanics of frozen soil. The 3D finite element modeling is based on the Galerkin method. We apply the p correlation of the roadbed temperature and the infiltration fl roposed method in this paper to the field data to calculate the ow when culverts present in the roadbed in warm season. Research conclusions：The calculation shows a significant effect on the roadbed temperature by the infiltration flow in the roadbed with culverts. The infiltration increase the melting depth of the roadbed seasonal change. In the seepage area, the frozen size and level increase as well which would affect the safety of the roadbed. This paper has an important guiding significance for knowing the roadbed temperature field characteristics and seepage effect, and provides a certain theoretical basis for the engineering construction at the high and cold area.