柴木铁路热棒试验断面冷却效果研究  

Study on Cooling Effect of Thermal Pipes for Permafrost Embankment of Chaidaer-Muli Railway

作　　者：徐舜华[1,2] 王兰民[1,2] 吴志坚[1,2] 盛煜[3] 陈继[3] 

机构地区：[1]中国地震局兰州地震研究所,兰州730000 [2]中国地震局甘肃省黄土地震工程重点实验室,兰州730000 [3]中国科学院寒区旱区环境与工程研究所,兰州730000

出　　处：《地下空间与工程学报》2015年第3期687-694,共8页Chinese Journal of Underground Space and Engineering

基　　金：中国地震局预测研究所基本科研业务费项目(2013A75-6);冻土工程国家重点实验室开放基金项目(SKLFSE201104);甘肃省自然科学基金(145RJZA165);国家自然科学基金项目(40902094)

摘　　要：柴达尔至木里铁路是青海省地方铁路,全线均有多年冻土分布,依据青藏铁路热棒应用的成功经验,其部分路段施行了热棒冷却措施。不同于青藏铁路沿线气候和冻土条件,柴木铁路热棒应用效果有待于检验。设置三个试验断面,分析了气温条件,比较研究了热棒和无热棒路基地温变化的不同,结果表明:(1)柴木铁路大风频繁、气温低、温差大的气候条件有利于热棒的应用;(2)无热棒断面路基地面深度3 m以下地温波动较小,长期稳定在-1℃附近;(3)在第二个冻融周期的冬季,热棒能够有效地降低路基温度;(4)热棒断面路基第二年的冬季降温效果非常显著,冻土上限最大抬升了1.5 m。热棒冷却措施能够保障柴木铁路多年冻土路基稳定,为铁路的正常运营提供保证。Chaidaer-Muli Railway is a local railway in Qinghai Province, along which the permafrost distributed. Based on experience of cooling embankment by thermal pipes used along Qinghai-Tibet railway,this technology is now used along Chaidaer-Muli Railway. Three experimental sections were designed to investigate cooling effect by analyzing atmosphere and differences of ground temperature between thermal pipe embankment and non-thermal-pipe embankment,the results showed that,（ 1） the climate in Chaidaer-Muli region with frequent strong winds,low air temperatures and large temperature range are in favor of application of thermal pipes;（ 2） the ground temperatures at depth below 3m in non-thermal pipe section vary in a narrow range,stabilizing at about- 1℃ in long-term;（ 3） the permafrost embankment temperature can be lowered effectively by thermal pipe in winter of the second freezethaw cycle;（ 4） the ground temperature of thermal pipe embankment is obviously lowered in the next winter compared to that of non-thermal pipe section,and permafrost table is raised about 1.5m. Application of thermal pipe along Chaidaer-Muli railway would guarantee stability of permafrost embankment and operation of train in the future.

关 键 词：柴达尔-木里铁路 多年冻土 热棒 地温 冻土上限 

分 类 号：P642.14[天文地球—工程地质学]