基于灌注桩试验的多年冻土区桩–土传热过程分析

doi:10.13722/j.cnki.jrme.2019.0903

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Abstract In order to study the temperature distribution and variation of piles and the pile-soil heat transfer process after concrete pouring in permafrost regions，a systematic study was carried out based on the observation results of in-situ test and theoretical analysis of cast-in-place piles in Beiluhe of Qinghai—Tibet Plateau. The results show that，with the completion of concrete pouring，the pile body presents an obvious stratification phenomenon in terms of heat transfer between the pile and the surrounding soil. The exothermic heat flow of the pile above the upper limit of permafrost is relatively weak，while the lower part is relatively strong. The direction of the heat flow vector is mainly horizontal and heat flow mainly concentrates near the upper limit of permafrost. In terms of temperature change，the upper and lower parts of the pile body show different temperature change processes. The upper part experiences a rapid heating and slow cooling process while the lower part shows a relatively stable cooling process，which results in a large temperature difference in the depth direction of the pile with a maximum temperature gradient of about 11℃/m. The heat mainly concentrates in the upper part of the pile，forming a high temperature core. Therefore，there may be a problem of insufficient strength due to low temperature at the pile bottom，and large temperature difference along the depth of the pile may lead to temperature cracks in the concrete. In order to raise the curing temperature of concrete and to reduce the generation of temperature cracks in concrete，it is suggested to control the molding temperature reasonably or to use low-temperature early-strength concrete.

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	CHEN Kun1
	2
	YU Qihao1
	GUO Lei1
	LUO Xiaoxiao1
	2
	CHEN Ji3

Cite this article:

CHEN Kun1,2,YU Qihao1, et al. Analysis of pile-soil heat transfer process based on field test in permafrost regions#br#[J]. , 2020, 39(7): 1483-1492.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0903 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I7/1483

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