[1]刘建龙,滕继东,罗彦斌,等.非饱和粗粒土水气迁移冻胀模型及参数分析[J].长安大学学报(自然科学版),2025,45(5):129-139.[doi:10.19721/j.cnki.1671-8879.2025.05.011]
　LIU Jian-long,TENG Ji-dong,LUO Yan-bin,et al.Frost heave model and parameter analysis of unsaturated coarse-grained soils induced by vapor transfer[J].Journal of Chang’an University (Natural Science Edition),2025,45(5):129-139.[doi:10.19721/j.cnki.1671-8879.2025.05.011]
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非饱和粗粒土水气迁移冻胀模型及参数分析()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第45卷
期数:
2025年5期
页码:
129-139
栏目:
桥梁与隧道工程
出版日期:
2025-09-30

文章信息/Info

Title:
Frost heave model and parameter analysis of unsaturated coarse-grained soils induced by vapor transfer
文章编号:
1671-8879(2025)05-0129-11
作者:
刘建龙1; 滕继东2; 罗彦斌1; 张升2; 盛岱超2; 3
(1. 长安大学 公路学院,陕西 西安 710064; 2. 中南大学 土木工程学院,湖南 长沙 410075; 3. 悉尼科技大学 土木与环境工程学院,新南威尔士 悉尼 2007)
Author(s):
LIU Jian-long1;  TENG Ji-dong2;  LUO Yan-bin1;  ZHANG Sheng2;  SHENG Dai-chao2; 3
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Civil Engineering,Central South University, Changsha 410075, Hunan, China; 3. School of Civil and Environmental Engineering, University of Technology Sydney, Sydney 2007, New South Wales, Australia)
关键词:
路基工程;  非饱和土;  粗粒土;  水气迁移;  冻胀模型;  数值分析
Keywords:
Key words:subgrade engineering;  unsaturated soil;  coarse-grained soil;  vapor transfer;  frost heave model;  numerical analysis
分类号:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2025.05.011
文献标志码:
A
摘要:
为预测非饱和粗粒土的水气迁移冻胀,并分析边界条件对非饱和粗粒土冻胀的影响规律,基于刚性冰冻胀模型框架,通过理论分析气态水迁移诱发冰透镜体的形成与生长机制,提出了冰透镜体的萌发判据,推导了考虑气态水作用的质量和能量平衡方程,建立了非饱和粗粒土水气迁移冻胀模型,并更新了自编的土体冻胀计算软件PCHeave,实现了模型的数值求解,并利用该软件分析了上覆压力、边界温度等因素对非饱和粗粒土冻胀的影响规律及冰透镜体的分布特征。研究结果表明:模型计算值与气态水补给的非饱和粗粒土一维冻胀试验值表现出较好的一致性,冻结7 d的最大冻胀量平均误差约为3.7%,提出的模型能够合理反映非饱和粗粒土的冻胀过程; 随着上覆压力的增大,冻胀量减小,分凝温度降低,冻结锋面处孔隙水压力增大,上覆压力达到300 kPa时,冻结细砾中的分凝温度约为-2 ℃,最大孔隙水压力约为0.3 kPa; 冻胀量随冻结指数和温度梯度的增大而增大,冻结锋面处的孔隙水压力随冻结温度的降低而增大; 冰透镜体主要集中在冻结锋面附近,冻结温度阶梯式下降条件下,冰透镜体近似呈均匀层状分布。研究结果可为寒区非饱和粗粒土路基的冻胀防治提供理论参考。
Abstract:
To predict the frost heave of unsaturated coarse-grained soils induced by vapor transfer and to analyze the influence of boundary condition on the frost heave, a rigid ice frost heave model framework was adopted. Through the theoretical analysis of formation and growth mechanisms of ice lenses induced by vapor transfer, a criterion for ice lens initiation was proposed, and the governing equations for mass and energy balance considering vapor transfer were derived. A frost heave model of unsaturated coarse-grained soils was established considering vapor transfer. The in-house computational software PCHeave was updated to implement the model numerically. Using this software, the effects of overburden pressure and boundary temperature on the frost heave and distribution characteristics of ice lens were investigated. The research results indicate that the values calculated by the model agree well with one-dimensional frost heave test results of unsaturated coarse-grained soils with vapor supply. The average error is about 3.7% in the maximum frost heave after 7 d of freezing. The proposed model can reasonably reflect the frost heave process of unsaturated coarse-grained soils. With the increase in the overburden pressure, the frost heave and the segregation temperature decrease, while the pore water pressure at the freezing front increases. When the overburden pressure is 300 kPa, the segregation temperature in the freezing gravel is about -2 ℃, and the maximum pore water pressure is about 0.3 kPa. With the increase in the freezing index and temperature gradient, the frost heave increases. The pore water pressure at the freezing front increases as the freezing temperature decreases. The ice lens mainly occurs near the freezing front and is approximately distributed in uniform layers when the freezing temperature stepwise decreases. These findings provide a theoretical reference for frost heave prevention and control of unsaturated coarse-grained soil subgrades in cold regions.2 tabs, 11 figs, 34 refs.

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备注/Memo

备注/Memo:
收稿日期:2025-03-22
基金项目:国家自然科学基金项目(52308338); 中国博士后科学基金项目(2023M740360); 国家资助博士后研究人员计划(GZB20230621); 中央高校基本科研业务费专项资金项目(300102214105)
作者简介:刘建龙(1989-),男,河南叶县人,讲师,工学博士,E-mail:jianlongliu@chd.edu.cn。
更新日期/Last Update: 2025-09-30