基于突变级数法的块石结构路基降温效果评价

doi:10.13722/j.cnki.jrme.2018.1273

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摘要为综合评价块石结构路基的降温效果，以青藏铁路北麓河试验段块石护坡加厚路基、封闭块石护坡路基、开放与封闭块石基底路基和U型块石路基为研究对象。从冻土内部因素、外部因素2个方面出发，选取13个因子作为底层评价指标，采用突变级数法对块石结构路基的降温效果进行评价，建立由4个层次结构组成的块石结构降温效果评价模型。结果显示，评价结果与实测结果基本一致，评价结果能够较为准确地反映块石结构路基降温效果的强弱。在工程设施完成之初，块石护坡加厚路基易受工程热扰动影响，表现为弱降温效果；在地温变化达到相对稳定后，由于不同块石结构路基降温机制存在差异，U型块石路基、开放块石基底路基为强降温效果，封闭块石基底路基降温效果较强，块石护坡加厚路基、封闭块石护坡路基降温效果一般，其中U型块石路基的评价值大于0.97，降温效果最强。

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	赵翃婷1
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关键词 ：路基工程, 块石路基, 降温效果评价, 突变级数法

Abstract：In order to comprehensively assess the cooling effect of the crushed rock embankment on permafrost，different embankments such as the open-system crushed rock thickened revetment，the closed-system crushed rock revetment，the open-system and closed-system crushed rock basement and the U-shaped crushed rock embankments in the Beiluhe test section of the Qinghai—Tibet Railway were investigated. Selecting thirteen factors as the bottom evaluation indices from internal and external factors of permafrost，the cooling effect of the crushed rock embankment was evaluated by catastrophe progression method，and a comprehensive evaluation model which consists of four hierarchical structures was proposed. The results show that the evaluation results are basically line with the measured results and the calculated results can accurately reflect the strength of the cooling effect of the crushed rock embankment. The thickened revetment of the crushed rock slope is susceptible to the thermal disturbance of the engineering at the initial operation period of the engineering measures and presents a weak cooling effect. When the change of the ground temperature reaches a relatively stable state，the cooling effect shows different due to the different cooling mechanisms of different crushed rock embankments. The U-shaped crushed rock embankment with an evaluation value more than 0.97 has strongest cooling effect，in turn followed by the open-system crushed rock basement embankment，the closed-system crushed rock basement embankment，the crushed rock thickened revetment and the closed-system crushed rock revetment.

Key words： subgrade engineering crushed rock embankment assessment of cooling effect catastrophe progression method

引用本文:

赵翃婷1，2，吴青柏1，张中琼1，侯彦东3. 基于突变级数法的块石结构路基降温效果评价[J]. 岩石力学与工程学报, 2019, 38(8): 1686-1695.
ZHAO Hongting1，2，WU Qingbai1，ZHANG Zhongqiong1，HOU Yandong3. Assessment of cooling effect of the crushed rock embankment based on catastrophe progression method#br#. , 2019, 38(8): 1686-1695.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1273 或 http://www.rockmech.org/CN/Y2019/V38/I8/1686

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