冻土区块石护坡路基调温效果试验研究

›› 2006, Vol. 27 ›› Issue (11): 2001-2004.

冻土区块石护坡路基调温效果试验研究

孙志忠，马巍，李东庆

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，兰州 730000

收稿日期:2005-02-02 出版日期:2006-11-10 发布日期:2013-12-04
作者简介:孙志忠，男，1974年生，博士研究生，助研，主要从事寒区岩土工程方面的科研工作
基金资助:
中国科学院知识创新工程重大项目(No.KZCX1-SW-04)，国家自然科学基金重大项目(No.90102006)，“973”国家重点基础研究发展规划项目(No.2002CB412704)，中国科学院寒旱所人才引进基金项目(No.2004122)和国家自然科学基金(No.40401013)资助。

Study of adjusting temperature effect of ripped-rock in-situ

SUN Zhi-zhong, MA Wei, LI Dong-qing

State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China

Received:2005-02-02 Online:2006-11-10 Published:2013-12-04

摘要/Abstract

摘要： 块石护坡调温路基是多年冻土区铁路设计中所采取的一种积极保护冻土的措施，该调温过程包括暖季的热屏蔽作用和冷季的对流降温两个方面。根据现场观测资料，对两种不同粒径的块石层下地温热状况给予了初步分析。结果表明，暖季小块石层（粒径为50～80 mm）的热屏蔽作用要优于大块石层（粒径为400～500 mm），而冷季大块石层的对流降温作用要强于小块石层；综合一个暖冷季循环周期来看，大块石层的调温效果要好于小块石层。块石护坡路基下0 ℃等温线大部分已基本接近原天然地表。初步认为，此种发展趋势有利于路基的稳定。

关键词: 块石护坡, 冻融过程, 冻土上限, 热屏蔽, 对流降温, 调温效果

Abstract: One of the measures of actively and forwardly protecting frozen soil is adjusting the temperature of embankment by ripped-rock layer, used in the railway design in permafrost regions. The effect of adjusting temperature consists of heat shield during summer-time and convective cooling during winter-time. In this study, a preliminary analysis was given to the thermal regime of ground temperature under the ripped-rock layer with both different grain diameters based on the in-situ measured data. The result showed that during summer-time, the ripped-rock layer with a grain diameter of 50－80 mm had better heat barrier than that one of 400－500 mm, but during winter-time, the latter had stronger convective cooling action. By a cyclic contrast, it was still found that the latter was excess to the former in the adjusting temperature. Moreover, the mostly part of 0℃ isotherm has closed to the natural ground surface when the foundation soil under the revetment reaches the maximum of thawed depth; this will be benefit to the thermal stability of embankment.

Key words: ripped-rock layer, grain diameter, permafrost table, heat shield, convective cooling, effect of adjusting temperature

中图分类号:

O 416.1

孙志忠，马巍，李东庆. 冻土区块石护坡路基调温效果试验研究[J]. , 2006, 27(11): 2001-2004.

SUN Zhi-zhong, MA Wei, LI Dong-qing. Study of adjusting temperature effect of ripped-rock in-situ[J]. , 2006, 27(11): 2001-2004.

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