青藏铁路隔热板路基温度场时程演化模拟  

Numerical simulation study on evolution of temperature field of thermal insulation subgrade of Qinghai-Tibet Railway

作　　者：田立慧 王师捷 陈维新 郭源灏 Tian Lihui;Wang Shijie;Chen Weixin;Guo Yuanhao(School of Mining Engineering,Heilongjiang University of Science&Technology,Harbin 150022,China;Institute of Ecological Geology Survey&Research of Heilongjiang Province,Harbin 150030,China)

机构地区：[1]黑龙江科技大学矿业工程学院,哈尔滨150022 [2]黑龙江省生态地质调查研究院,哈尔滨150030

出　　处：《黑龙江科技大学学报》2024年第6期949-956,共8页Journal of Heilongjiang University of Science And Technology

基　　金：黑龙江省省属高等学校基本科研业务费项目(2021-KYYWF-1474)。

摘　　要：为探究被动冷却工程措施对高温多年冻土路基热稳定性的长期影响,以青藏铁路为研究对象,运用ABAQUS数值模拟软件,对比分析了普通路基和加筑EPS隔热板的被动冷却地基型路基的温度场特征。结果表明:随着青藏高原气候变暖,普通路基多年冻土双向收缩逐年退化,而路基中铺设的隔热板具有双向阻热作用,在路基修筑后的一段时间融深减少了1.52 m,原天然上限处地温降低了0.01℃,但之后因为环境气温不断升高,环境温度的过余冻结能力降低,多年后冻土上限位置无法持续保持稳定,修筑路基第50年,多年冻土几乎完全退化。This paper aims to investigate the long-term effects of passive cooling engineering measures on the thermal stability in high-temperature permafrost subgrade.By taking Qinghai-Tibet Railway as object,the study compares and analyzes the temperature field characteristics behind the passive cooling subgrades with and without EPS insulation board by using ABAQUS analysis software.The results show that with the warming of the Qinghai-Tibet Plateau climate,the permafrost of the ordinary subgrade shrinks in both directions and degrades year by year,while the subgrade with insulation board performs a bidirectional heat resistance effect.The melting depth decreases by 1.52 m,and the ground temperature at the natural upper limit reduces by 0.01℃after the subgrade constructed for a certain period of time.Thereafter,due to the continuous increase in ambient temperature,the residual freezing capacity of the ambient temperature reduces,and the upper limit position of the permafrost cannot keep stable for a long time.By the 50th year of subgrade construction,the permafrost almost degrades completely.

关 键 词：青藏铁路 隔热板路基 温度场 多年冻土 

分 类 号：TU445[建筑科学—岩土工程]