冻融循环作用下锥柱式桩基础水热及变形动态变化规律研究

doi:10.13722/j.cnki.jrme.2017.1228

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Abstract In cold regions，the moisture，temperature and deformation of foundations is affected by freeze-thaw cycles. The cone-cylindrical pile is a kind of short expanded pile with a base，which has been widely used in permafrost regions，but its theoretical research is still lagging behind engineering practice. Through model test，temperature field，moisture field and vertical deformation of pile and soil were monitored by temperature sensors，moisture sensors and laser displacement meters, respectively. Combined with the number of freeze-thaw cycles，the dynamic variation laws of moisture，temperature and deformation were analyzed. The results show that the freezing depth of backfill increases with freeze-thaw cycles. The pile foundation is more sensitive to the ambient temperature change and thermal conductivity of pile is better than that of soil，so pile foundation can provide a good heat exchange channel between deep soil and external environment. Therefore，the temperature field distribution during the freeze-thaw cycles is closely related to the pile shape. The moisture migration is driven by temperature potential，gravity potential and capillary action，and the migrating water is blocked by frozen layer and the base of pile. The water content reduces at pile side，and accumulates at the pile bottom. The deformation of pile and soil increases with the freeze-thaw cycles. The maximum deformation of pile foundation is 8.0 mm，and the soil deformation is up to 1.9 mm. The relative deformation between pile and soil dramatically increases in the first several cycles，and then increases slowly，ultimately achieves a dynamic stable deformation stage.

Key words： foundation engineering cone-cylindrical pile freeze-thaw cycle model test temperature field moisture field deformation

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	Articles by authors
	SHI Xiangyang1
	2
	ZHANG Ze1
	LI Dongqing1
	ZHOU Panfeng3
	FENG Wenjie1

Cite this article:

SHI Xiangyang1,2,ZHANG Ze1, et al. Research on dynamic variation of moisture，temperature and deformation of cone-cylindrical pile under freeze-thaw cycles[J]. , 2019, 38(S1): 3092-3101.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1228 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/3092

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