青藏铁路普通路基下冻土过程动态评价  

DYNAMIC ASSESSMENT OF PERMAFROST UNDER ORDINARY EMBANKMENT OF QINGHAI-XIZANG RAILWAY

作　　者：于晖[1] 吴青柏[1] 张建明[1] 

机构地区：[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,兰州730000

出　　处：《工程地质学报》2009年第1期94-99,共6页Journal of Engineering Geology

基　　金：国家自然科学基金委员会杰出青年基金(No.40625004);中国科学院西部行动计划项目(No.KZCX2-XB2-10)资助

摘　　要：本文主要利用青藏铁路北麓河厚层地下冰试验段中普通路基下部冻土温度的监测资料,对路基下部冻土温度变化和热收支特征进行了分析,并对修筑普通路基后多年冻土热融蚀敏感性和热稳定性进行了计算。结果表明,修筑普通铁路路基后,虽然多年冻土人为上限有较大幅度抬升,但原天然上限以下多年冻土温度却逐年升高,表现为显著的吸热状态。同时冻土热融蚀敏感性增强,冻土热稳定性下降,对路基热稳定性将产生较大的影响。After the railroad has been constructed in will be changed to a new one. At the same time, the permafrost regions, the balance of heat income and expense change acts on the feature of permafrost. Based on the monitored data along the Qinghai - Tibet railway, the changes of permafrost under the railway are analyzed. The results indicate that the permafrost table was raised and the ground temperature increased. The permafrost thermal thawing sensitivity and permafrost thermal stability of permafrost under the roadbed have respectively increased and decreased comparing with those of permafrost under the nature surface after construction of ordinary embankments. All the changes words thermal of permafrost may influence the stability of the railway embankment.

关 键 词：青藏铁路 多年冻土 热收支 冻土热融蚀敏感性 冻土热稳定性 

分 类 号：P642.14[天文地球—工程地质学]