摘要
热管路基是青藏铁路最为广泛使用的主动保护多年冻土的措施之一。针对应用于青藏铁路多年冻土工程中的热管类型，考虑路基土体中水的相变问题，建立热管-土体-大气系统的物理和数学模型，采用Carlekin方法求解，推导出考虑全球气温升高的冻土中热管热流密度随时间的变化规律。采用有限单元数值分析方法，利用青藏铁路清水河的气象和地质资料，在热管倾斜角度分别为0°，10°，20°，30°，15°，60°时，研究热管对多年冻土路基的冷却效果及提高路基整体稳定性的作用。研究表明，热管在坡脚埋设的倾斜角度为25°～30°时，对于路基中心、路肩及坡脚下多年冻土上限的抬升效果最佳，有利于保证路基的长期稳定性。
Thermosyphon is one of the most widely used technologies in Qinghai Tibet railway embankments. This paper is based on the type of the thermosyphon used in the Qinghai- Tibet railway. Using the simulation method and the weather and geology data of Qingshuihe test section, this paper considered the water phase of the freezing soil, established the physical and mathematical models of the air-thermosyphon soil system, provided the procedure of solution by Carlekin method, derived the heat flux-time variation by formula in soil body while thermosyphons were used and at the same time global warming was considered. This paper studied the cooling effect of thermosyphons on embankment ground and its role on the whole stability of embankment on Qinghai-Tibet railway at different inclination angles of thermosyphons of 0°, 10°, 20°, 30°, 45°, 60°. As a result, it is showed that when the thermosyphons lay on the slope base at the inclination angle of 25°-30°, the lift effects on permafrost table under embankments of center, shoulder and toe all reach the best state and get to the most favorable effect on increasing the long-term stability of the permafrost embankments.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2006年第3期1-7,共7页
China Railway Science
基金
中国博士后科学基金资助项目(2005037150)
铁道部科技研究开发计划项目(2001QZ-19)
关键词
青藏铁路
路基
多年冻土
热管
倾斜角度
数值分析
Qinghai-Tibet railway
Embankment
Permafrost
Thermosyphon
Inclination angle
Nu-merical analysis
