高速公路路基长期THM耦合模拟性能研究

Long-Term THM Coupling Simulation Performance Study of Highway Subgrade

摘要: 为准确掌握多场耦合作用下寒区路基长期使用过程中冻胀变形规律，基于路基实际工程地质情况，通过建立THM耦合模型，使用COMSOL软件对路基长期使用性能进行预测。结果表明：经过十年左右路基结构基本达到稳定状态；路基温度变化随着深度的增加呈现明显的滞后效应，在路基达到稳定之前，路基的高低温峰值逐年减小；路基融沉位移小于冻胀位移，且两者逐年递增，另外路中位移大于左右路肩位置；路基冻结深度在非稳定期内增加了80%左右。

Abstract: In order to accurately grasp the law of freezing and deformation during the long-term use of subgrade in cold areas under the action of multi-field coupling, based on the actual engineering geology of the subgrade, the THM coupling model was established and the long-term performance of the subgrade was predicted by using COMSOL software. The results show that: the subgrade structure basically reaches a stable state after about ten years; the temperature change of the subgrade shows obvious hysteresis effect with the increase of depth, and the high and low temperature peaks of the subgrade decrease year by year before the subgrade reaches a stable state; the thawing and sinking displacement of the subgrade is smaller than the freezing and swelling displacement, and it increases year by year, and in addition, the middle of the road is displaced more than the left and right shoulders; the freezing depth of the subgrade increases by about 80% in the non- stable period.