考虑冻土–桩接触面流变效应的基础长期服役性能演变

doi:10.3724/1000-6915.jrme.2024.0240

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Abstract Mechanical properties of contact interfaces have significant dynamic fluctuations due to freeze-thaw cycles and rheological effect，which directly affects the long-term service performance of piles in permafrost environments，and remains to be further studied. To employing numerical simulation，firstly，a visco-elastic-plastic constitutive model for frozen soil considering the rheological effect was constructed. Secondly，the conventional Kelvin model was improved and a visco-elastic constitutive model for the contact interface between frozen soil and pile was constructed. Furthermore，a thermal-mechanical fully coupling model was established considering the rheological effect of both frozen soil and the contact interface. Verified by laboratory model test，this model was employed to reveal the evolution law of long-term service performance of pile. Results show that：The proposed contact interface model can reflect the influence of stress level on rheological effect. During the freeze-thaw cycle，the shaft resistance gradually decreased(39%) on the upper pile as the ground temperature rose，while accompanied by a corresponding increase(20%) on the lower pile. The reverse is true when the ground temperature drops. In addition，under the long-term rheological effect，the bearing capacity gradually exerts in the upper pile and the shaft resistance increases(50%)，while a 14% decrease in the deep pile correspondingly. The neutral point is at 2/5 pile length. In the end，there is a strict linkage mechanism between tip resistance and shaft resistance. In the whole pile length，the distribution of shaft resistance also has an up-down linkage mechanism，and the change of shaft resistance at a certain depth is governed by the stress state and its development trend of the whole pile. The coupling effect of rheology and freeze-thaw cycles affects the depth distribution of shaft resistance，which results in a dynamical changes in bearing mode of the pile，and ultimately has a significant influence on the service performance of the pile. Research results reveal the significant influence of rheological effect on the long-term service performance of piles in permafrost ground，which would offer a reference and basis for further simulation research，and provide theoretical support for the design，construction，operation，and maintenance of piles in permafrost regions.

Key words： pile foundation frozen ground contact interface rheological effect long-term service performance numerical simulation

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	SHI Rui1
	2
	WEN Zhi1
	2
	WANG Xu1

Cite this article:

SHI Rui1,2,WEN Zhi1, et al. Evolution of long-term service performance of foundation considering rheological effect of contact interface between frozen soil and pile[J]. , 2025, 44(S1): 262-272.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0240 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/IS1/262

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