青藏铁路多年冻土区不同结构路基长期稳定性分析  

Analysis of long-term stability of subgrade with different structures of the Qinghai-Tibet Railway in permafrost regions

作　　者：刘有乾 美启航 董添春 张寿红 赵耀军 张德龙 陈继 Liu Youqian;Mei Qihang;Dong Tianchun;Zhang Shouhong;Zhao Yaojun;Zhang Delong;Chen Ji(China Railway Qinghai Tibet Group Co.,Ltd.,Xining 810007,China;Beiluhe Observation and ResearchStation of Frozen Soil Engineering and Environment,State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environmental and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]中国青藏铁路集团有限公司,西宁810007 [2]中国科学院西北生态环境资源研究院青藏高原北麓河冻土工程与环境综合观测研究站,兰州730000

出　　处：《青海交通科技》2024年第3期77-83,共7页Qinghai Transportation Science and Technology

基　　金：中国国家铁路集团有限公司科技研究开发计划(K2022G017)。

摘　　要：在高温、高含冰多年冻土区,气候变暖导致的冻土升温造成了青藏铁路部分路基断面出现明显的沉降变形。为了解气候升温背景下不同结构路基的稳定性变化过程,本研究选取了普通路基、U型块石结构路基和块石护坡路基进行分析。通过分析2006—2018年的地温和变形监测数据,研究这三种类型路基的稳定性以及多年冻土地温和路基变形的关系。研究表明,这三个断面中U型块石结构路基地温稳定性最好,块石护坡路基浅层地温稳定性优于普通路基,但其深层多年冻土的地温稳定性较差。对路基变形监测数据的分析表明,三种路基的变形稳定性从高至低分别为U型块石结构路基、块石护坡路基和普通路基。此外,通过分析含冰量与地温变化数据发现,对于减小路基变形而言,控制浅层多年冻土的升温和融化相比于控制深层地温更有效。In the warm and ice-rich permafrost regions,the permafrost warming caused by climate warming has caused the obvious deformation settlement of some subgrade sections of the Qinghai-Tibet Railway.In order to understand the stability change process of subgrade with different structure under the climate warming,this study analyzes the traditional subgrade,U-shaped crushed-rock subgrade and crushed-rock revetment subgrade.Based on the analysis of the monitoring data of ground temperature and deformation from 2006 to 2018,the relationship between ground temperature and deformation of these three type subgrades is discussed.The results show that the ground temperature stability of U-shaped crushed-rock subgrade is the best among the three sections,and the ground temperature stability of shallow subgrade with crushed-rock revetment is better than that of traditional subgrade,but the ground temperature stability of deep permafrost is poor.The analysis of deformation monitoring data shows that the deformation stability of three subgrade from high to low is U-shaped crushed-rock subgrade,crushed-rock revetment subgrade and traditional subgrade.In addition,through the analysis of ice content and ground temperature data,it is found that controlling the warming and melting of shallow permafrost is more effective than the deep to reduce the deformation of subgrade.

关 键 词：青藏铁路路基 多年冻土 地温 变形 含冰量 

分 类 号：U213.1[交通运输工程—道路与铁道工程]