青藏铁路路桥过渡段沉降变形影响因素分析

›› 2011, Vol. 32 ›› Issue (S2): 372-377.

青藏铁路路桥过渡段沉降变形影响因素分析

牛富俊¹，林战举^{1, 2}，鲁嘉濠^{1, 2}，刘华^{1, 2}

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；2. 中国科学院研究生院，北京 100049

收稿日期:2011-04-20 出版日期:2011-08-10 发布日期:2011-08-26
作者简介:牛富俊，男，1970年生，博士，研究员，主要从事寒区岩土工程、地质灾害及环境方面的研究
基金资助:
国家自然科学基金重点项目资助（No. 41030741）；国家自然科学基金杰出青年基金资助（No. 40625004）；创新群体资助（No. 40821001）；科技部973计划前期研究专项资助（No. 2010CB434813）；冻土工程国家重点实验室自主项目资助（No. SKLFSE-ZY-07）

Study of the influencing factors of roadbed settlement in embankment-bridge transition section along Qinghai-Tibet Railway

NIU Fu-jun¹, LIN Zhan-ju^{1, 2}, LU Jia-hao^{1, 2}, LIU Hua^{1, 2}

1.State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2011-04-20 Online:2011-08-10 Published:2011-08-26

摘要/Abstract

摘要： 青藏铁路于2006年7月1日建成通车，已运行5年。总体上铁路路基是稳定的，但由于铁路建设在以高温高含冰量为特征的多年冻土之上，冻土的微小变化会诱发路基病害的发生，其中路桥过渡段沉降变形是比较典型，也是最为普遍的一类路基病害。通过对青藏铁路西大滩至尺曲谷地164座桥梁路桥过渡段沉降病害调查及相关因素分析。过渡段路基沉降与桥走向的南北端、路基坡向、路基高度、多年冻土类型（含冰量）、地温、路基结构以及地质条件等因素相关。桥北端平均沉降量大于南端，阳坡大于阴坡；沉降量随着路基高度呈对数趋势增加；富冰、饱冰等高含冰量冻土区沉降明显高于多冰、少冰地段，高温多年冻土区沉降量高于低温多年冻土区；路基结构对过渡段沉降也有一定的响应性，表现为特殊结构路基沉降较小；粉土、粉质黏土等细颗粒地层段沉降量比砾石土等其他岩性地段大。通过相关性分析表明，过渡段路基沉降与坡向相关系数最大，为0.234，其次为与路基填土高度，为0.213，与桥南北端、路基结构、冻土含冰量也呈正相关关系；与地温的负相关性比较显著，为-0.210，其次与地质条件呈现出负相关性

关键词: 青藏铁路, 路桥过渡段, 路基沉降, 多年冻土, 相关性分析

Abstract: The Qinghai-Tibet Railway (QTR) project was finished on July 1 2006, and has served for over five years. Judging from the present situation, the roadbed is stable and train speed in permafrost regions achieves 100 km/h as expected during the designing. However, as half part of the roadbed was constructed over the permafrost characterized by high ground temperature and high ice-content, slight changes of the permafrost might lead to roadbed problems, of which the settlement in embankment-bridge transition section is an obvious and special one. Investigated results of 164 bridges from the Xidatan Basin to the Chiqu Valley along the QTR showed that the settlement was influenced by factors including bridge orientation, embankment slope direction, embankment height, ground temperature, ground ice-content of permafrost and local subgrade soil type. For the average value of the settlement, it was greater at the northern end of a bridge than that at the southern end, and was greater in sunny-slope than that in shady-slope. It was greater in high-ice permafrost regions than that in low-ice regions, and was greater in high-temperature permafrost regions than that in low-temperature regions. Additionally, it increased logarithmically with the height of the embankment. In regions where the subgrade soils were dominated by silt, silty clay or fine sand, the settlement amount was higher than that in bedrock regions. Correlation analysis results show that there are good relationships between the settlement and the slope direction, embankment height, ground temperature and ice contents when some of the later items are quantified. And the correlation coefficients are 0.234, 0.213, -0.21 and 0.151 respectively, when the factors are quantified.

Key words: Qinghai-Tibet Railway, roadbed-bridge transition section, roadbed settlement, permafrost, correlation analysis

中图分类号:

U 213.1

牛富俊，林战举，鲁嘉濠，刘华. 青藏铁路路桥过渡段沉降变形影响因素分析[J]. , 2011, 32(S2): 372-377.

NIU Fu-jun , LIN Zhan-ju , LU Jia-hao , LIU Hua. Study of the influencing factors of roadbed settlement in embankment-bridge transition section along Qinghai-Tibet Railway[J]. , 2011, 32(S2): 372-377.

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