| 换填法抑制季节冻土区铁路路基冻胀效果分析 |
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| 引用本文： | 许健,牛富俊,牛永红,刘华.换填法抑制季节冻土区铁路路基冻胀效果分析[J].中国铁道科学,2011,32(5). |
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| 作者姓名： | 许健 牛富俊 牛永红 刘华 |
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| 作者单位： | 1. 西安建筑科技大学土木工程学院,陕西西安 710055;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 |
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| 基金项目： | 国家自然科学基金重点资助项目(40730736); 国家“八六三”计划项目(2008AA11Z103); 中科院知识创新工程重要方向项目(KZCX2-YW-Q03-04,KZCX3-SW-351) |
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| 摘 要： | 以沈哈线路基A、B组填料为研究对象,采用室内冻胀试验,研究粉黏粒含量对其冻胀特性的影响.试验表明:路基填料的冻胀系数随粉黏粒含量增加而增加,且增幅逐渐增大；结合沈哈线路基基床厚度及沿线最大冻深,为保证路基不产生冻胀破坏,应确保换填用路基A、B组填料中不含有粉黏粒.采用非稳态相变温度场的数学模型和热弹塑性冻胀模型,进行沈哈线换填试验段冻土路基冻融过程温度场及冻胀应力、变形场计算分析.结果表明:天然地面下2m左右为冻融活动层,是诱发路基土体冻胀的主要因素；用非冻胀性A、B组填料换填基床厚度范围内的冻胀性土层后,路堤填筑土体无冻胀变形产生,路基中的拉应力(拉应变)区域外移到距离路堤坡脚4m以外的天然地表下土体,大大减弱了对路堤的破坏作用,计算结果与实际情况相符.
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| 关 键 词： | 路基 季节冻土 换填法 冻胀系数 冻胀变形 |
Analysis on the Effect of Replacing-Soil Method on Inhibiting Frost Heave of Railway Roadbed in Seasonal Frozen Soil Region |
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| XU Jian,NIU Fuiun,NIU Yonghong,LIU Hua.Analysis on the Effect of Replacing-Soil Method on Inhibiting Frost Heave of Railway Roadbed in Seasonal Frozen Soil Region[J].China Railway Science,2011,32(5). |
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| Authors: | XU Jian NIU Fuiun NIU Yonghong LIU Hua |
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| Affiliation: | XU Jian1,2,NIU Fujun2,NIU Yonghong2,LIU Hua2(1.College of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China,2.State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China) |
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| Abstract: | A,B class filler obtained along Shenyang-Harbin Railway was taken as the research object.The effect of silt and clay particle content on the frost heaving characteristics of filling material was investigated with indoor freezing and heaving experiments.The results show that the frost heaving coefficient of the roadbed filling increases with the increase of silt and clay particle content,and the amplitude increases gradually.To prevent the existing subgrade from frost heaving damage,it is necessary to make A... |
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| Keywords: | Subgrade Seasonal frozen soil Replacing-soil method Frost heaving coefficient Frost heave deformation |
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