高温冻土区高速公路特殊结构路基地温分布特征及降温效果分析

doi:10.13722/j.cnki.jrme.2016.1570

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Abstract

Based on the monitored ground temperature data of special-structured subgrade of Gonghe-Yushu expressway in Qinghai province，this article analyzed ground temperature variations of foundation soil and subgrade fillings of three kinds of subgrades(XPS insulation board subgrade，crushed rock subgrade and ventilated subgrade)，the changes of artificial permafrost table，the heat flux density near the permafrost table and the asymmetry of subgrade temperature distribution in a comparative way，aiming to study distribution characteristics of ground temperature and cooling effects of three kinds of subgrades. The results indicate that：(1) the temperatures at left and right shoulders of all three kinds of subgrades present a significant increasing trend at different depths. During the observation period，the temperature of XPS insulation board subgrade increases by the largest extent，followed by the crushed rock subgrade and ventilated subgrade. (2) During the initial period after construction，the artificial permafrost tables of three kinds of subgrade rise in different degree, yet declined in the third year. (3) The heat budget of three kinds of subgrade near permafrost table remains a heat absorbing state，the relationship of absorbed heat amount can be listed as：XPS insulation board subgrade＞crushed rock subgrade＞ventilated subgrade. (4) The internal temperature of three kinds of subgrade distributes asymmetrically，featured by high on the left side and low on the right. According to the results，ventilated subgrade is recommended in the construction of expressway in warm permafrost regions. At the same time, we should stick to the principle of differentiated design to reduce the longitudinal cracks and other diseases caused by uneven distribution of ground temperature.

Key words： road engineering ground temperature distribution characteristics cooling effect special-structured subgrade

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	Articles by authors
	TAI Bowen1
	LIU Jiankun1
	FANG Jianhong2
	LIU Hui1
	TIAN Yahu1

Cite this article:

TAI Bowen1,LIU Jiankun1,FANG Jianhong2, et al. Analysis on distribution characteristics of ground temperature and cooling effect of special-structured subgrade of the expressway in warm permafrost region[J]. , 2017, 36(S1): 3696-3704.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1570 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3696

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