| 高速铁路路涵过渡段路基冻结特征试验研究 |
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| 引用本文： | 牛富俊,刘华,牛永红.高速铁路路涵过渡段路基冻结特征试验研究[J].岩石力学与工程学报,2014,33(3):639-646. |
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| 作者姓名： | 牛富俊 刘华 牛永红 |
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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. 中交第一公路勘察设计研究院 多年冻土区
道路建设与养护行业重点实验室，陕西 西安 710068；3. 西安建筑科技大学 土木工程学院，陕西 西安 710055) |
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| 基金项目： | 国家自然科学基金资助项目(41071045,51208409);国家自然科学基金创新群体项目(41121061) |
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| 摘 要： | 对典型涵洞的路涵过渡段路基土体的冻结特征展开监测，并分析路涵过渡段路基及其下地基土的冻结特征和时空变化过程及其对路基稳定性的影响。结果表明，涵洞的存在使得台后路基冻结深度约为天然场地最大冻结深度的2倍，同时涵顶和涵底的冻结时刻和融解时刻均较涵侧要早；涵洞间接充当了通风管道的作用，减弱了路基的阴阳坡效应差异；涵洞的存在对其周围路堤的温度场有明显的影响，其显著增大了涵顶、涵侧填料温度随气温变化的幅度。通过对路涵过渡段土体冻结特征的监测分析，为涵下地基处理和路涵过渡段的路基填料选择及铺设方式提供参考。
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| 关 键 词： | 土力学季节冻土高速铁路路涵过渡段冻结特征热稳定性 |
| 收稿时间： | 2013-05-06 |
EXPERIMENTAL STUDY OF FREEZE CHARACTERISTICS IN ROADBED- CULVERT TRANSITION SECTION ALONG A HIGH-SPEED RAILWAY |
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| NIU Fujun,LIU Hua,NIU Yonghong.EXPERIMENTAL STUDY OF FREEZE CHARACTERISTICS IN ROADBED- CULVERT TRANSITION SECTION ALONG A HIGH-SPEED RAILWAY[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(3):639-646. |
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| Authors: | NIU Fujun LIU Hua NIU Yonghong |
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| Affiliation: | (1. State Key Laboratory of Frozen Soil Engineering，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China；2. Cold Regions Road Engineering Laboratory，CCCC;
First Highway Consultants Co.，Ltd.，Xi?an，Shaanxi 710068，China；3. School of Civil Engineering，Xi'an University ;
of Architecture and Technology，Xi?an，Shaanxi 710055，China) |
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| Abstract: | Based on monitoring of ground temperature in a typical roadbed-culvert transition section，the ground temperature regime and its temporal and spatial development，along with its impact on roadbed stability was analyzed. The results show that，the maximum depth of seasonal freezing in the roadbed of transaction is about 2 times which in the natural ground because of the existence of culvert. The starting times of freezing and thawing process above and below the culvert are earlier than that behind the culvert wall. As the culvert performs somewhat as a ventilation duct，the temperature difference caused by the sunny-shady slopes is weaken. The culvert has a significant impact on the ground temperature of the roadbed around it，showing as significant increase of temperature changing amplitude in the fillings above the culvert and behind the culvert wall. Above all，the works of monitoring and analysis of the freezing characteristics in roadbed-culvert transition section can provide references for the selection of roadbed filling material and foundation treatment below the culvert. |
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| Keywords: | soil mechanics seasonal frozen ground high-speed railway roadbed-culvert transition section freeze characteristics thermal stability |
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