| 青藏铁路块石路基冷却降温效果对比分析 |
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| 引用本文： | 穆彦虎,马巍,孙志忠,刘永智.青藏铁路块石路基冷却降温效果对比分析[J].岩土力学,2010,31(Z1):284-292. |
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| 作者姓名： | 穆彦虎 马巍 孙志忠 刘永智 |
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| 作者单位： | 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 |
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| 基金项目： | 中国科学院西部行动计划(二期)项目，国家自然科学基金创新群体项目，国家自然科学基金，中国博士后科学基金特别资助金项目，冻土工程国家重点实验室项目，西部交通建设科技项目 |
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| 摘 要： | 基于现场地温监测数据,对青藏铁路两种主要块石路基(块石护坡及U型块石路基)在不同年平均地温分区的冷却降温效果进行对比分析,发现不论是在低温基本稳定区(年平均温度-2.0℃≤TCP-1.0℃)还是高温极不稳定区(TCP-0.5℃),两种块石路基的应用都能够有效地提升路基下部多年冻土上限。但两种不同块石结构路基表现出不同的冷却降温效果,其中U型块石路基冷却降温效果较好,在路基下多年冻土上限提升及下伏浅层多年冻土降温的同时,深层多年冻土温度保持稳定;而块石护坡路基下人为多年冻土上限的提升及浅层多年冻土温度的降低一定程度上消耗了下伏深层多年冻土的冷量,从而导致其温度有所升高。同时,在不同的年平均地温分区块石路基表现出不同的冷却降温效果:年平均地温较低断面,块石路基冷却降温效果显著。在年平均地温较高的断面,尤其是高温极不稳定多年冻土区,块石护坡路基下伏深层多年冻土温度升高明显,路基长期稳定性难以得到保证。
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| 关 键 词： | 块石护坡路基 U型块石路基 冷却降温 多年冻土 青藏铁路 |
| 收稿时间： | 2010-04-28 |
Comparative analysis of cooling effect of crushed rock embankment along the Qinghai-Tibet Railway |
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| MU Yan-hu,MA Wei,SUN Zhi-zhong,LIU Yong-zhi.Comparative analysis of cooling effect of crushed rock embankment along the Qinghai-Tibet Railway[J].Rock and Soil Mechanics,2010,31(Z1):284-292. |
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| Authors: | MU Yan-hu MA Wei SUN Zhi-zhong LIU Yong-zhi |
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| Institution: | State Key Laboratory of Frozen Soils Engineering, Cold and Arid Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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| Abstract: | Based on the in-situ monitoring data of ground temperature along the Qinghai-Tibet Railway, the cooling effects of crushed rock embankments (crushed rock revetment embankment and U-shaped crushed rock embankment) positioned in different permafrost regions with diverse mean annual ground temperatures were analyzed. The comparative analysis showed that either in basically stable low temperature permafrost regions (mean annual ground temperature -2.0 ℃≤TCP<-1.0 ℃) or in badly unstable warm permafrost regions (mean annual ground temperature TCP>-0.5℃), the crushed rock embankment had uplift the permafrost table beneath the embankment effectively; but the two kinds of crushed rock embankment performed different in providing cooling effect. The latter produced more cooling effects than the former; it could keep the deep permafrost thermal stable while raising the permafrost table and cooling the shallow permafrost. Whereas the rising of permafrost table beneath the crushed rock revetment somewhat consumed the cold energy of deep permafrost and consequently made the deep permafrost warmer. The analysis also indicated that the lower the mean annual ground temperature, the stronger the cooling effect of air-convection crushed rock embankment. It should be noted that in badly unstable warm permafrost regions, the crushed rock revetment hadn’t produced enough cooling effect and the underlying deep permafrost warmed considerably; so some enhancement measures are needed to ensure the long-term stability of the embankment. |
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| Keywords: | crushed rock embankment U-shaped crushed rock embankment cooling effect permafrost the Qinghai-Tiber Railway |
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