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
田立慧 1王师捷 1陈维新 1郭源灏2
作者信息
- 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
- 折叠
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.
Abstract
This paper aims to investigate the long-term effects of passive cooling engineering meas-ures 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Key words
Qinghai-Tibet Railway/insulation board roadbed/temperature field/permafrost引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据