青藏铁路粒径改良路基热状况分析.pdf

文档介绍：第 24 卷第 23 期岩石力学与工程学报 Vol . 24 No. 23
2005 年 12 月 Chinese Journal of Rock Mechanics and Engineering Dec.,2005



青藏铁路粒径改良路基热状况分析

黄明奎 1,2,汪稔 2,胡明鉴 2
(1. 重庆交通学院土木建筑学院,重庆 400074;2. 中国科学院武汉岩土力学研究所岩土力学重点实验室,湖北武汉 430071)

摘要:基于青藏铁路北麓河试验段粒径改良路基、普通路基、天然场地的地温监测资料,定量分析了 3 种方式下
土层的热状况变化特征。结果表明:修筑有路基的吸热量大于天然场地的吸热量;粒径改良路基经历的融化期略
长于天然场地,但远短于普通路基。从热收支状况来看,粒径改良路基放热强度大于吸热强度,总体呈现出放热
状态,但同天然场地相比,热收支变化不甚突出。粒径改良路基有使路基表层热收支趋于天然状态的趋势,具有
保护多年冻土的作用,是一种积极保护冻土的较好的措施。
关键词:土力学;粒径改良路基;热收支;地温;多年冻土
中图分类号:TU 431 文献标识码 A 文章编号 1000–6915(2005)23–4390–06

ANALYSIS OF THERMAL STATE UNDER PARTICLE REFORMATIVE
ROADBED IN QINGHAI—TIBET RAILWAY

HUANG Ming-kui1,2,WANG Ren2,HU Ming-jian2
(1. School of Civil Engineering and Architecture,Chongqing Jiaotong University,Chongqing 400074,China;2. Key Laboratory
of Rock and Soil Mechanics,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

Abstract:Based on observed data of particle reformative roadbed,normal roadbed and natural ground in Beiluhe
test site of Qinghai—Tibet Railway,the characteristics of underlying ground thermal regime of three modes are
quantitatively analyzed. Results indicate that the endothermic quantity of constructing embankment is greater than
that of natural field. The thaw period of particle reformative roadbed is longer than that of natural field,but les