东南大学学报（自然科学版）2025，Vol.55Issue(6)：1582-1591,10.DOI:10.3969/j.issn.1001-0505.2025.06.010
自然条件下路基含水率演变及其蒸发边界研究
Study on evolution of subgrade moisture content and evaporation boundary condition under natural conditions
摘要
Abstract
A subgrade-atmosphere coupled model based on water-heat transfer equations was constructed to predict internal moisture variation in subgrades during long-term service.The model was solved with Comsol,and a test-calibrated saturated-transition-residual three-stage evaporation rate equation was introduced.Con-tinuous evaporation,continuous rainfall,and dry-wet cycle boundaries were set,and the responses of sand and clay subgrades were examined.The results show that the model accurately reproduces the evaporation rate and moisture content distribution observed in column tests.Under continuous evaporation,the surface perme-ability coefficient and evaporation flux decay exponentially with decreasing moisture content,a water retention mechanism is formed,and the moisture gradient between shallow and deep layers increases.The dry-wet cycle weakens this mechanism,and the internal-external moisture gradient markedly reduces.Because of stronger water-holding capacity,the equilibrium moisture content of clay subgrades is higher than that of sand subgrades and the time required to reach stability is longer.The introduction of the three-stage evaporation boundary greatly improves model predictive accuracy under different climatic conditions and provides theoreti-cal support for moisture content control and durability assessment of subgrades.关键词
平衡含水率/蒸发/水热耦合/保水机制Key words
equilibrium moisture content/evaporation/hydrothermal coupling/water retention mechanism分类
土木建筑引用本文复制引用
曹志刚,程嘉俊,蔡袁强,宋文超,雷明..自然条件下路基含水率演变及其蒸发边界研究[J].东南大学学报（自然科学版）,2025,55(6):1582-1591,10.基金项目
国家自然科学基金资助项目(51978611) （51978611）
浙江省杰出青年基金资助项目(LR21E080004). （LR21E080004）
