| 青藏高原多年冻土地区公路路基变形 |
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| 引用本文： | 刘永智,吴青柏,张建明,盛煜.青藏高原多年冻土地区公路路基变形[J].冰川冻土,2002,24(1):10-15. |
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| 作者姓名： | 刘永智 吴青柏 张建明 盛煜 |
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| 作者单位： | 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, 甘肃, 兰州, 730000;2. 南京大学, 地球科学系, 江苏, 南京, 210093 |
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| 基金项目： | 中国科学院知识创新工程项目;KZCX1-SW-04; |
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| 摘 要： | 通过对现场实体工程的长期监测资料和路基破坏机理分析研究,使我们对沥青路面对多年冻土的严重影响,导致多年冻土的升温与退化,使路基产生较严重的不均匀下沉变形,及其它所引起的一系列路基病害问题的发生发展过程有了较为系统和深刻认识,取得了大量现场实测资料及研究成果.讨论了高温多年冻土地区冻土路基的变形特征,以及冻土路基变形与工程地质条件的关系,给出了路基随地温波动变化而发生的变形过程。
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| 关 键 词： | 青藏公路 冻土路基 路基变形 冻土路基病害 |
| 文章编号： | 1000-0240(2002)01-0010-06 |
| 收稿时间： | 2001-06-19 |
| 修稿时间： | 2001年6月19日 |
Deformation of Highway Roadbed in Permafrost Regions of the Tibetan Plateau |
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| LIU Yong-zhi ,WU Qing-bai ,ZHANG Jian-ming ,SHENG Yu.Deformation of Highway Roadbed in Permafrost Regions of the Tibetan Plateau[J].Journal of Glaciology and Geocryology,2002,24(1):10-15. |
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| Authors: | LIU Yong-zhi WU Qing-bai ZHANG Jian-ming SHENG Yu |
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| Institution: | 1. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China;2. Department of Earth Science, Nanjing University, Nanjing Jiangsu 210093, China |
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| Abstract: | It is a very difficult to solve roadbed deformation in permafrost regions, especially thaw settlement in warm permafrost regions. Thawing and temperature rising due to asphalt pavement has a great influence on roadbed stability. In order to study the process of roadbed deformation for different permafrost types and geophysical environments, roadbed deformation was monitored. There are three monitoring sections with uniform vertical and transverse observation directions and spaces. Each section has four transverse profiles consisting of 5 monitoring points. The relative deformation is monitored by transit instrument for three years since 1998. It is observed twice a month. The following conclusions are obtained: ;(1)Both vertical and transverse deformations due to permafrost thawing show a positive non-uniform feature, with the maximum deformation in the road should other than in the central of roadbed due to the shift of the maximum thaw depth to the road should.;(2)roadbed deformation of frozen soils includes frost heave and thaw settlement. Extensive frost heave occurs from December to January. Extensive thaw settlement occurs from April to July. In other months roadbed deformation is in the way of slow frost heave or thaw settlement.;(3)roadbed deformation mainly depends on mean annual ground temperature and engineering geological conditions of permafrost. For warm permafrost with mean annual ground temperature high than -1.5 ℃, roadbed deformation extensively change with mean annual ground temperature. Roadbed deformation mainly appears in the section with high ice content, and the larger the ice content, the larger the thaw settlement.;(4)Non-uniform deformation of roadbed under thawing is due to the effect of asphalt pavement on permafrost. Its essential is that the absorption of asphalt pavement can results in engineering geological conditions worse, because of continuously changing permafrost thermal regime, permafrost temperature rising and ground ice thawing. |
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| Keywords: | permafrost regions roadbed deformation thaw settlement and frost heave roadbed damage in permafrost regions |
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