高温冻土区填土路基融化固结变形分析

doi:10.7522/j.issn.1000-0240.2014.0073

冰川冻土 ›› 2014, Vol. 36 ›› Issue (3): 614-621.doi: 10.7522/j.issn.1000-0240.2014.0073

高温冻土区填土路基融化固结变形分析

张青龙¹, 李宁², 马巍², 穆彦虎², 李国玉²

1. 甘肃省交通科学研究院有限公司, 甘肃兰州 730050;
2. 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, 甘肃兰州 730000;
3. 西安理工大学岩土工程研究所, 陕西西安 710048

收稿日期:2014-01-04 修回日期:2014-04-29 出版日期:2014-06-25 发布日期:2014-07-16
作者简介:张青龙（1985-），男，河南信阳人，2012年在中国科学院寒区旱区环境与工程研究所获硕士学位，现主要从事寒区岩土工程研究.E-mail：qinglongzhang1101@163.com
基金资助:
国家自然科学基金创新群体项目（40821001）；冻土工程国家重点实验室自主研究项目（09SF103003；SKLFSE-ZY-03）资助

Analyses of the thawing consolidation of fill embankments in warm permafrost regions

ZHANG Qinglong¹, LI Ning², MA Wei², MU Yanhu², LI Guoyu²

1. Gansu Provincial Communication Science Research Institute Co., Ltd, Lanzhou 730050, China;
2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
3. Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China

Received:2014-01-04 Revised:2014-04-29 Online:2014-06-25 Published:2014-07-16
Contact: 李宁，E-mail:ningli@lzb.ac.cn E-mail:ningli@lzb.ac.cn

摘要/Abstract

摘要： 基于修正拉格朗日（U.L）描述下的大变形固结理论和考虑相变作用的温度场得到大变形融化固结理论，对不同路堤高度下填土路基温度场和融沉变形进行研究. 结果表明：高温冻土区合理高度的路堤在5~10 a内使冻土上限略微抬升，但冻土有明显升温. 冻土上限在未来的5~10 a后会急剧下降，且路堤高度越小，下降量越大. 与小变形融化固结理论相比，大变形融化固结理论预测高含量冻土融沉变形的精度更高. 融沉量与路堤高度成正比，且随着时间的增长，融沉变形呈阶梯型发展，路堤越高，阶梯现象越显著. 定义融沉量与路堤高度之比为沉降比，研究发现路堤越低，其沉降比越大，且随时间线性增长. 沉降比是冻土融深增量的单值函数，与路堤高度无关，通过沉降比函数可以快速而实用的求出融沉变形量.

关键词: 高温高含冰量冻土, 填土路基, 融化固结, 大变形理论, 沉降比

Abstract: In this paper, the large strain thawing consolidation theory is proposed by combining with large strain consolidation theory with Updated Lagrangian description and thermal conduction equation with phase change. Thermal regimes and thawing settlements of fill embankments with various heights in warm permafrost regions are researched. Thermal analyses indicated that permafrost table will move upwards slightly beneath the embankment with a reasonable height in 5-10 years after construction, but the underlying permafrost will warm significantly. In the context of climate warming, the permafrost table begins to decline quickly after 5-10 years of embankment construction. The lower the embankment height is, the larger the table's decline is. Compared with the small strain thawing consolidation theory, the large strain theory is more applicable for thawing settlement of ice-rich frozen soils. The embankment deformation develops quickly during the warm seasons but slowly in cold seasons. And the higher the embankment is, the larger the thawing settlement is. Lastly, a settlement ratio, defined as thawing settlement of embankment to its height, is proposed. It is found that this ratio is lineal proportional to time, and will increase with embankment height decreasing. Additionally, the settlement ratio is a function of thawing depth increment and is independence with embankment height. Thus, the amount of embankment thawing settlement can be obtained from the function of settlement ratio expeditiously and practically.

Key words: warm and ice-rich frozen soil, fill embankments, thawing consolidation, large strain theory, settlement ratio

中图分类号:

U416

张青龙, 李宁, 马巍, 穆彦虎, 李国玉. 高温冻土区填土路基融化固结变形分析[J]. 冰川冻土, 2014, 36(3): 614-621.

ZHANG Qinglong, LI Ning, MA Wei, MU Yanhu, LI Guoyu. Analyses of the thawing consolidation of fill embankments in warm permafrost regions[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2014, 36(3): 614-621.

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高温冻土区填土路基融化固结变形分析

Analyses of the thawing consolidation of fill embankments in warm permafrost regions

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