摘要
结合青藏铁路清水河试验段试验,研究通风管路基的温度特性,根据通风管路基基底1m范围内和边坡位置及冻土上限位置热量周转和通风管内外温度,分析通风管路基对保护多年冻土的有效性。研究结果表明:青藏高原严寒的气候为通风管的适用性提供了环境条件;在路基中埋入通风管,不但增加了路基与空气的接触面,而且通过高原空气的强对流活动,消耗路基体中存在的热量,有效阻止路基表面吸收的辐射热量下传,起到了保护下伏多年冻土维持冻结状态的作用;通风管路基作为青藏高原多年冻土区的一种新结构形式,为青藏铁路的建设和安全运营提供了技术支撑。
Combining with the tests of Qingshuihe experimental section of Qinghai-Tibet Railway,the temperature characteristics of the ventilated embankment have been studied. The validity of the ventilated embankment in the protection of permafrost has been analyzed according to the ventilation pipe embankment and the slope position within 1 m and the permafrost locations inside and outside the heat flow. The results show that the severe cold climate of Qinghai-Tibet Plateau has provided the environmental condition for the applicability of the vent-pipe. Embedding the vent-pipe in the embankment not only can increase the contact surface between the embankment and the air,but also can effectively prevent the going-down of the radiation heat absorbed by the roadbed surface through the strong convective activities of the plateau air to consume the heat in the embankment,which can protect the underlying permafrost to maintain the role of frozen state. As a new structure form in the permafrost regions of Qinghai-Tibet Plateau,the ventilated embankment has provided a favorable technical support for the construction and safe operation of Qinghai-Tibet Railway.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2010年第4期7-11,共5页
China Railway Science
基金
铁道部科技研究开发计划项目(2001G001-B-05)
关键词
通风管
路基
温度特性
多年冻土
青藏铁路
Ventilation pipeline
Embankment
Temperature characteristics
Permafrost
Qinghai-Tibet Railway
