| 青藏铁路清水河地区路基下伏多年冻土地温变化特征研究 |
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| 引用本文： | 李忠,汪琦,司剑峰.青藏铁路清水河地区路基下伏多年冻土地温变化特征研究[J].工程地质学报(英文版),2006,14(1):90-95. |
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| 作者姓名： | 李忠 汪琦 司剑峰 |
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| 作者单位： | 石家庄铁道学院土木分院 石家庄050043(李忠，司剑峰)，石家庄铁道职业技术学院 石家庄050041(汪琦) |
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| 基金项目： | 铁道部科技攻关项目“青藏线格拉段高温冻土路基沉降变形预测及计算试验研究”资助(项目编号:清水河2001G001-B-02-01) |
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| 摘 要： | 基于埋设在青藏铁路清水河地区路基中两个断面内的共8个地温测试孔3年来的地温观测资料,研究了该地区铁路路基下伏高原多年冻土融化特征,分析了多年冻土上限的变化规律以及填筑铁路路基施工对下伏多年冻土赋存条件的影响。研究表明,由于受到填筑路基时赋存在路基填料内的热量的影响,铁路路基下伏多年冻土近地表的地温变化特征与天然地面下的多年冻土的地温变化特征有明显的不同,且向阳面与被阴面差别较大。多年冻土的上限在施工初期会有一个明显的下移沉降,随着时间的推移,虽然残存在路基中的热量逐渐消散,多年冻土上限下降会逐渐稳定。由于受到太阳辐射和路基边坡形状及融化夹层的影响,多年冻土上限会逐渐稳定,但不会在短时期内上升到天然地面下多年冻土的上限水平。
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| 关 键 词： | 铁路路基 高原多年冻土 地温变化特征 冻土上限 |
| 文章编号： | 1004-9665/2006/14（01）-0090-06 |
| 收稿时间： | 2005-04-29 |
| 修稿时间： | 2005-07-28 |
CHARACTERIZATION FOR GROUND TEMPERATURE OF THE PLATEAU PERMAFROST UNDERLYING THE QINGHAI-TIBETAN RAILWAY EMBANKMENT |
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| LI Zhong,WANG Qi,SI Jianfeng.CHARACTERIZATION FOR GROUND TEMPERATURE OF THE PLATEAU PERMAFROST UNDERLYING THE QINGHAI-TIBETAN RAILWAY EMBANKMENT[J].Journal of Engineering Geology,2006,14(1):90-95. |
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| Authors: | LI Zhong WANG Qi SI Jianfeng |
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| Institution: | 1.Shijiazhuang Railway Institute, Shijiazhuang 050043;2.Shijiazhuang Railway Technology Institute, Shijiazhuang 050041;1;2;3;4 |
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| Abstract: | Based on three year measurement data from eight measurement boreholes located in the embankment and beside the embankment,the author studied variation of the ground temperature of the plateau permafrost underlying the Qinghai-Tibetan railway embankment and thawing effects.The results indicate that there are four features of the plateau permafrost as listed:(1) average ground temperature of the plateau permafrost underlying the railway embankment is much higher than that under the natural ground.(2) thawing-layer forming at 0.5m-3.5m from the ground surface that controls the change of the plateau permafrost underlying the railway embankment,(3) decline of the upper limit of the plateau permafrost underlying the railway embankment that would be stopped slowly as the heat rises gradually in the railway embankment,and(4) difference in the ground temperature due to exposure to the Sun. |
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| Keywords: | Permafrost Railway embankment Ground temperature Thawing feature |
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