Based on the problem of disease prevention and control in saline soil subgrades in seasonal frozen regions, this study takes the K222+500 section of the Qinghai-Tibet Railway around Qinghai Lake as the research object. By employing theories of unsaturated soil mechanics, principles of linear elastic continuum mechanics, and a multi-field coupling model, a mathematical theoretical framework considering the porous, multiphase, and multicomponent characteristics of saline soil was established. Numerical simulations were conducted to analyze the evolution patterns of the temperature field, porosity, and frost heave displacement under different subgrade structures and combined measures of thermal insulation layers and slope protection. The research results indicate that reducing the subgrade height within the range of 5 m to 6 m can significantly increase the soil temperature in winter and reduce the peak frost heave displacement. Increasing the subgrade width to above 12.8 m can effectively delay the onset of low temperatures and mitigate shallow salt frost heave diseases. The composite technology of thermal insulation layers (10~20 cm) and slope protection (1.0~1.3 m) can synergistically block heat transfer and improve the thermal insulation effect of the soil beneath the subgrade slope and berm. The research findings provide a theoretical basis and engineering reference for the optimal design and disease prevention of saline soil subgrades in seasonal frozen regions.
TANG Xian-xi, LI Wen-long, FENG Su-hang.
Mathematical Theory of Saline Subgrade in Seasonal Frozen Regions and Numerical Analysis of Frost Heave Control Measures[J].
Science Technology and Engineering, 2026, 26(22): 9652-9670 DOI:10.12404/j.issn.1671-1815.2505754
数值分析技术为解决这一难题提供了新途径。有限元法(finite element method,FEM)和离散元法(discrete element method,DEM)在多物理场耦合仿真中的成熟应用,以及新兴的机器学习辅助建模方法,为模拟复杂边界条件下的路基冻胀过程开辟了可能性。但目前针对盐渍土-冻胀-工程措施三者交互作用的动态数值模拟研究仍存在参数敏感性不明确、本构关系简化过度等问题。
MaWeibin. Review and outlook on frost damage mechanisms and prevention technologies for railway tunnels in cold regions of China[J]. Journal of the China Railway Society, 2025, 47(6): 196-210.
[3]
原国红. 季节冻土水分迁移的机理及数值模拟[D]. 长春: 吉林大学, 2006.
[4]
YuanGuohong. Mechanism and numerical simulation of moisture migration in seasonal frozen soil[D]. Changchun: Jilin University, 2006.
[5]
由明卓. 冻土水、热、力三场耦合关系及数值模拟研究[D]. 北京: 北方工业大学, 2010.
[6]
YouMingzhuo. Study on the coupled relationship of moisture, heat, and force fields in frozen soil and its numerical simulation[D]. Beijing: North China University of Technology, 2010.
TianYahu, LiuJiankun, QianZhengyu, et al. Numerical simulation of temperature field of embankment with insulation layer in permafrost regions[J]. China Railway Science, 2002(2): 59-64.
HuTianfei, LiTianfeng, YuanYifei, et al. Review of frost damage prevention and control technologies for railway subgrade in frozen soil regions[J]. Journal of the China Railway Society, 2025, 47(4): 141-154.
GeJianjun. Numerical simulation study on temperature field of insulation revetment subgrade of Qinghai-Xizang Railway in permafrost regions[J]. Journal of Glaciology and Geocryology, 2008(2): 274-279.
ChenJiayu, TianYahu, ChiXiujing. Simulation analysis of temperature characteristics of wide highway subgrade in permafrost regions[J]. Subgrade Engineering, 2015(3): 22-29.
WangShuangjie, CuiFuqing, ChenJianbing, et al. Numerical simulation of temperature field of wide subgrade in permafrost regions based on atmosphere-ground coupling model[J]. China Journal of Highway and Transport, 2016, 29(6): 169-178.
[17]
AbedA A, SolowskiW T. A study on how to couple thermo-hydro-mechanical behaviour of unsaturated soils: physical equations, numerical implementation and examples[J]. Computers and Geotechnics, 2017, 92: 132-155.
[18]
RutqvistJ, BörgessonL, ChijimatsuM, et al. Thermohydromechanics of partially saturated geological media: governing equations and formulation of four finite element models[J]. International Journal of Rock Mechanics and Mining Sciences, 2001, 38(1): 105-27.
ChenXingxin, BaiBing, CaiQipeng. Analytical solution for particle accelerated migration in porous media considering adsorption-desorption effects[J]. Rock and Soil Mechanics, 2015, 36(6): 1698-1706.
ZhouLizeng. Study on water and salt migration and deformation characteristics of unsaturated sulfate saline soil under temperature gradient[D]. Lanzhou: Lanzhou University of Technology, 2021.
[23]
TremosaJ, GailhanouH, ChiabergeC, et al. Effects of smectite dehydration and illitisation on overpressures in sedimentary basins: a coupled chemical and thermo-hydro-mechanical modelling approach[J]. Marine and Petroleum Geology, 2020, 111: 166-178.
[24]
胡冉. 非饱和土水力全耦合模型与数值模拟方法研究[D]. 武汉: 武汉大学, 2013.
[25]
HuRan. A fully coupled hydromechanical model and numerical simulation method for unsaturated soils[D]. Wuhan: Wuhan University, 2013.
GuoZhiguang, BaiBing. Effect of saturation on coupled thermo-hydro-mechanical responses in porous media[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(6): 1021-1028.
ZhouFengxi, JuWentao, ZhangLiujun. Study on heat and mass transfer and deformation characteristics of sulfate saline soil under unidirectional freezing conditions[J]. Rock and Soil Mechanics, 2023, 44(3): 708-716.
GaoPeng, FeiChunwei, ZhouYuanfu, et al. Thermal insulation measures for open cut tunnels in low-altitude seasonal frozen soil[J]. Science Technology and Engineering, 2025, 25(24): 10449-10458.
SunRuohan, LiuRun, WangXiaolei, et al. Anti-frost heave and thaw settlement effects of horizontal and three-dimensional reinforced soil in seasonal frozen regions[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S1): 16-21.
ZhuangYan, WangSai. Study on frost heave effect of prestressed double-facing retaining wall based on freeze-thaw cycle constitutive model[J]. Journal of Central South University (Science and Technology Edition), 2024, 55(1): 242-254.
DongLiang, WuYike, ZouJia'an, et al. Numerical simulation study on frost heave Characteristics of railway subgrade-bridge transition section in alpine seasonal frozen soil regions[J]. China Railway Science, 2024, 45(1): 68-78.
ZhangKangjian, ZhangZhiqiang, ZhuXingyu, et al. Analytical solution of frost heave pressure in semi-elliptical local water accumulation space of tunnels in cold regions[J]. Science Technology and Engineering, 2025, 25(16): 6922-6932.
PangChangqiang, CaiHaibing, YangZhe, et al. Numerical simu-lation study on frost heave control of subway tunnel construction by zonal freezing method[J]. Journal of Railway Science and Engineering, 2026, 23(3): 1270-1282.