冻土路基温度场、变形场和应力场的耦合分析

基于提出的正冻土三场耦合的理论框架以及所开发的全面考虑正冻土骨架、冰、水三相介质水、热、力与变形的真正耦合作用的分析系统3G2001,对214国道花石峡试验路基实测的地温变化和路基路面变形进行了对比分析验证;根据路面冻胀融沉过程曲线,将冻土路基的变形过程分为4个阶段,即剧烈冻胀阶段、冻胀持续稳定阶段、剧烈融沉阶段和融沉持续稳定阶段,揭示了冻土路基冻胀融沉的热力学内在机制。对比结果显示:分析所得的路基温度场与实测值变化规律一致,其量化相差在10%~20%以内;分析所得耦合变形随时间的变化与实测值相一致,路中的分析变形值与实测值相差也在允许范围内。

Coupling Analysis of Temperature, Deformation and Stress Field for Frozen Soil Roadbed

Based on the heat-moisture-deformation coupling model for freezing soil proposed by the authors which took into account three phase medium of soil skeleton and ice and water and its analysis software 3G2001,a coupling numerical simulation analysis for the Huashixia roadbed was conducted and insite measurements results for Huashixia roadbed were also introduced to compare to the numerical results of the proposed model.The deformation of frozen soil roadbed was divided into four phases,which included the intense frozen heaving,the continual frozen heaving,the intense thawing and the continual thawing from the road surface deformation.The results indicate that numerical results of the temperature field variations along the roadbed depth at different time are with very good correlation to the measurements,and so do numerical results of the relatively freezing deformations of road surface,both numerical accuracy to the measurements are within 10%~20%.The comparison analysis shows the proposed theoretical frame and its numerical modeling for the temperature-moisture deformation coupling behaviors are suitable and acceptable.