深季节冻土区高速铁路抗冻胀基床结构稳定性研究  

Stability of anti-frost heave subgrade bed of high-speed railway in deep seasonally frozen soil regions

作　　者：亓守臣 QI Shouchen(China Railway 14th Bureau Group Co.,Ltd.,Jinan 250101,China)

机构地区：[1]中铁十四局集团有限公司,山东济南250101

出　　处：《铁道科学与工程学报》2022年第5期1177-1186,共10页Journal of Railway Science and Engineering

基　　金：中国科学院冻土工程国家重点实验室基金资助项目(SKLFSE-ZQ-52)。

摘　　要：为揭示深季节冻土区高速铁路抗冻胀基床结构的效果和稳定性,确保高速列车在冬季的安全运营,以我国深季节冻土区高速铁路典型抗冻胀基床结构为研究对象,通过现场试验和理论分析相结合的方法,研究深季节冻土区抗冻胀基床结构水热力学行为演变的内在机理,分析深季节冻土区高铁路基工程温度场非对称的一般特征,讨论影响寒区路基工程阴阳坡效应的关键因素。研究结果表明:1)季节冻融层和非冻结层的地温和横向温差随时间推移均呈现正弦规律变化。2)当基床表层和底层温度接近0℃时,对应土层内的未冻水含量迅速减小或增加。3)冻胀主要发生在冻结初期和冻融交替期。同时,融沉的结束时间滞后于冻结层的消失时间。4)不同深度处阴阳肩的温差在全年均大于0℃,影响寒区路基工程阴阳坡效应的主要因素是线路走向和主风向。综上所述,建议深季节冻土区的高速列车在冻结初期和冻融交替期减速行驶。同时,为减弱路基阴阳坡效应引起的横向非均匀变形,路基两侧应采取非对称设计的原则。To reveal the effect and stability of anti-frost subgrade bed structure of high-speed railway in deep seasonally frozen soil regions and ensure the safe operation of high-speed train in winter.Typical anti-frost subgrade bed structure of high-speed railway in the deep seasonal frozen soil region was taken as the research object.Through the combination of field test and theoretical analysis,the internal mechanism of water-thermaldeformation behavior of anti-frost subgrade were systematically studied.General characteristics of the lateral asymmetry of temperature field for high-speed railway subgrade was analyzed.The key factors of the sunnyshady slope effect of subgrade engineering in cold regions wer discussed.The results are drawn as follows.1)The ground temperature and lateral temperature difference of seasonal freeze-thaw layer and non-frozen layer change sinusoidal with times.2)The unfrozen water in the corresponding soil layer decreases or increases rapidly when the temperature of the surface layer and bottom layer of the subgrade bed approaches 0℃.3)Frost heave mainly occurs at the initial freeze and the freeze-thaw alternate period,and the end time of subgrade thaw settlement lags behind the disappearance time of frozen layer.4)The temperature difference between the sunnyshady shoulders at different depths is greater than 0℃in the whole year.The main factors affecting the sunnyshady slope effect of subgrade engineering in cold regions are the line route direction and main wind direction.To sum up,it is recommended that high-speed trains in deep seasonally frozen soil regions slow down operation at the initial freeze and the freeze-thaw alternate period.At the same time,in order to reduce the lateral non-uniform deformation caused by the sunny-shady slope effect of the subgrade,the principle of asymmetric design should be adopted on both sides of the subgrade.

关 键 词：深季节冻土 高速铁路 路基工程 冻胀 

分 类 号：TU528[建筑科学—建筑技术科学]