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冰川冻土 ›› 2003, Vol. 25 ›› Issue (6): 614-620.

• 冻土物理与寒区工程 • 上一篇    下一篇

青藏铁路管道通风试验路基地温变化及热状况分析

牛富俊, 俞祁浩, 赖远明   

  1. 中国科学院, 寒区旱区环境与工程研究所冻土工程国家重点实验室, 甘肃, 兰州, 730000
  • 收稿日期:2003-10-27 修回日期:2003-11-10 出版日期:2003-12-25 发布日期:2012-04-26
  • 作者简介:牛富俊(1970),男,甘肃会宁人,副研究员,1998年于西安工程学院获博士学位,主要从事冻土工程研究工作.E-mail:niufujun@ns.lzb.ac.cn
  • 基金资助:
    国家自然科学基金项目(50008016;40225001);中国科学院"西部之光"计划项目;中国科学院知识创新工程重大项目(KZCX1-SW-04)资助

Analysis of Ground Temperature Change and Thermal Process in theTesting Duct-ventilated Embankment of the Qinghai-Tibet Railway

NIU Fu-jun, YU Qi-hao, LAI Yuan-ming   

  1. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China
  • Received:2003-10-27 Revised:2003-11-10 Online:2003-12-25 Published:2012-04-26

摘要: 基于青藏铁路北麓河试验段管道通风路基在2个冻融循环周期内的地温监测资料,分析了路基温度的发展、温度场分布特征及多年冻土的热流量变化.结果表明:通风管埋设于路堤中部的路基温度变化和发展情况与一般路基类似,路基在施工后的2个冻融周期内仍处于整体升温的过程;通风管埋设于路堤下部的路基,虽然前2个冻融循环周期内土体温度与原始状态相比同样有所升高,但开始出现逐渐降低的趋势,同时地温场的分布在横向上的对称性也比较好.在热交换方面,一般填土路基和通风管位于路堤中部的路基在施工后的前2个冻融循环周期内一直处于吸热过程,而通风管位于路堤下部的路基在经历了第1个周期的持续吸热过程后,在第2个冻融循环周期内已经开始放热.

关键词: 青藏高原, 铁路, 通风路基, 地温, 热流量

Abstract: Ground temperature was monitored for two years in the Beiluhe Testing Section of the Qinghai-Tibet Railway, where a field-testing embankment was constructed and observed. Based on the monitoring, the ground temperature change, thermal regime and thermal process are discussed. It is found that the ground temperature change and thermal process of duct-ventilation embankment with ducts posited at half height of the embankment are similar to those of normal embankment. The temperature of the roadbed roundly increases during the first two freezing-thawing circles after the embankment complicated. Both of the normal embankment and the high-posited duct ventilation embankment are passive in protecting permafrost. However, the duct-ventilated embankment with deep-posited ducts shows a striking difference. The ground temperature of the roadbed soon decreases during the second freezing-thawing circle, though it increases during the first circle. The underlying permafrost begins emission after the first circle. Such process indicates that the ventilating ducts are active in cooling the underlying permafrost when they are laid deeply in the embankment.

Key words: Tibetan Plateau, railway, ventilation embankment, ground temperature, thermal flux

中图分类号: 

  • P642.14