寒区隧道地基冻融变形的多场耦合数值模拟计算及应用

摘要

To analyze foundation deformation distribution of road tunnel in cold regions, a multi-field finite element model is established considering ice and water phase transition as well as hydrate heat.Through a detail calculation example with the section of a road tunnel in cold regions, the research result indicates that water content of ground and high air temperature in the tunnel are main reason causing the frost-heaving and thawing-settlement deformation.%为研究寒区隧道地基冻融变形情况,考虑水冰相变、水化热的作用,建立了隧道地基热-应力耦合计算有限元模型,以某寒区隧道的洞口段为计算对象进行了计算,研究结果表明,现有的寒区隧道保温技术在实际应用中对于冻土的保护不足,水分和隧道洞内的高低温变化是导致这一问题的主要原因.