| 深上限-退化型多年冻土路基变形特征分析 |
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| 引用本文： | 袁 堃,章金钊,朱东鹏.深上限-退化型多年冻土路基变形特征分析[J].岩土力学,2013,34(12):3543-3548. |
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| 作者姓名： | 袁 堃 章金钊 朱东鹏 |
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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，兰州730000； 2.中交第一公路勘察设计研究院有限公司，西安 710075 |
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| 基金项目： | 国家重点基础研究发展计划（No. 2012CB026106）；中交集团科技研发项目（No. 2011-ZJKJ-16） |
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| 摘 要： | 为了研究深上限-退化型多年冻土路基变形特点，基于青藏公路多年冻土路基地温和沉降现场监测资料，通过分析西大滩、唐古拉山北坡以及唐古拉山南坡路段的土质、冻土含冰量、冻土地温以及路基沉降变形数据，对冻土上限变化过程与路基沉降特点进行了研究，同时对沱沱河和清水河地区冻土路基分层沉降观测结果进行了分析。结果表明，土质和含冰量对退化型冻土路基的沉降变形影响较大，深冻土层的融化对路基沉降变形影响较小，退化型冻土路基的沉降变形主要发生在退化后的冻土层中，退化冻土层在冻融循环过程中，需要较长时间才能完成固结。对于冻土含冰量为少冰、多冰的稳定路段，退化冻土路基年平均沉降速度约为3.9～5.6 mm/a，路基沉降量极小；对于含冰量较高且土质以粉黏性颗粒为主的不稳定路段，路基沉降速度具有持续性和无减缓性的特点，路基年平均沉降量达到0.03 m/a，路基变形表现为整体均匀沉降，横向差异沉降量较小。
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| 关 键 词： | 道路工程 多年冻土 观测数据分析 路基沉降 |
| 收稿时间： | 2012-09-17 |
Analysis of deformation characteristics of embankment with deep permafrost table and degenerative permafrost |
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| YUAN Kun,ZHANG Jin-zhao,ZHU Dong-peng.Analysis of deformation characteristics of embankment with deep permafrost table and degenerative permafrost[J].Rock and Soil Mechanics,2013,34(12):3543-3548. |
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| Authors: | YUAN Kun ZHANG Jin-zhao ZHU Dong-peng |
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| Institution: | 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. CCCC First Highway Consultants Co., Ltd., Xi’an 710075, China |
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| Abstract: | In order to study the deformation characteristics of embankment with deep permafrost table and degenerative permafrost, based on the permafrost temperature and settlement monitoring data of Qinghai-Tibet Highway, the change process of permafrost table and embankment settlement characteristics were analyzed by analyzing the soil of permafrost, ice content of permafrost, permafrost temperature and embankment settlement deformation data in Xidatan, Tanggula North Slope and Tanggula South Slope. The layered settlement test data monitored from permafrost embankment in Tuotuohe and Qingshuihe area were also analyzed. The results show that the soil and ice content of permafrost have great effect on the degenerative permafrost embankment settlement; while deep permafrost melting has less effect on the embankment settlement. The settlement comes form degenerative permafrost layer and the consolidation of degenerative permafrost layer take a long time to complete in freezing and thawing cycle. In stable road section with permafrost of ice-poor and icy frozen soil, the degenerative embankment settlement rate is 3.9-5.6 mm/a approximately; and the degree of embankment settlement is very small. The embankment settlement has characteristics of persistence and no-slowing with soil of high ice content and powder clay; permafrost embankment deformation shows uniform settlement with less transverse differential settlement. |
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| Keywords: | road engineering permafrost monitoring data analysis embankment settlement |
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