摘要
柴达尔-木里铁路位于青藏高原东北部的祁连山南麓,沿线有超过75 km路基展布于大通河两岸的多年冻土湿地,其中,高温、高含冰量冻土路段超过35 km,冻土工程地质条件极差.出于冷却冻土、稳定路基的考虑,在沿线多处路段采用了热棒.柴木铁路沿线气象观测资料表明,冬季平均气温低,夏季有促进热棒工作的负温天气过程,再加上年平均风速较高,为提高热棒的冷却效果提供了有利的气候条件.根据在DK99+100、DK99+200和DK99+355三个热棒措施断面2007-2009年的地温监测结果,发现柴木铁路试验段的热棒可以有效地降低湿地型多年冻土的温度,提升冻土路基下的人为上限.
The Chaidaer-Muli Railway is located in the northeastern Tibetan Plateau and the south slopes of the Qilian Mountains.There is about 70 km railway winding along the Datong River,where permafrost appears with wetland,of which,more than 30 km is situated in ice-rich permafrost area with high temperature,where the frozen soil engineering geologic conditions are very poor.For the purpose of cooling soil and stabilizing the roadbed,heat pipes were adopted in a dozen sections of the railway.Meteorological observations near the sections show that the mean winter air temperature is low and mean annual wind speed is high.There appears cold weather with sub-freezing temperature in summer that helps the heat pipe to work efficiently.The above-mentioned climatic conditions are all beneficial to the heat pipe.According to the ground temperature observations in the three sections（DK99＋100 and DK99＋200 with heat pipes and DK99＋355 without heat pipe） measured from 2007 to 2009,the heat pipe could cool down the permafrost in the wetland area effectively and raise the artificial permafrost table beneath a frozen soil embankment.
出处
《冰川冻土》
CSCD
北大核心
2009年第4期688-694,共7页
Journal of Glaciology and Geocryology
基金
国家自然科学基金创新群体项目(40821001)
国家自然科学基金项目(40871040)资助
关键词
柴木铁路
热棒
冻土路基
湿地
Chaidaer-Muli Railway
heat pipe
frozen soil roadbed
wetland
