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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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

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	ZHAO Hongting1
	2
	WU Qingbai1
	ZHANG Zhongqiong1
	HOU Yandong3

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ZHAO Hongting1,2,WU Qingbai1, et al. Assessment of cooling effect of the crushed rock embankment based on catastrophe progression method#br#[J]. , 2019, 38(8): 1686-1695.

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

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