刚性桩复合地基与临近基坑支护结构相互影响的离心模型试验

doi:10.13722/j.cnki.jrme.2017.0157

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Abstract

There is a lack of research on the interaction between composite foundation and its retaining structure at present. To study the interaction between rigid-pile composite foundation in the vicinity of a deep excavation and its retaining structure affected by lateral excavation，two centrifuge model tests of composite foundation with lateral excavation which had the same load，same supporting structure and different replacement rates were carried out. It is analysis to the change laws with excavation of the pile axial force，the lateral frictional resistance，the pile-soil stress ratio，the vertical stress of the soil between piles，the moments of piles and the retaining structure，and their response to changes in replacement rate. The result shows that the pile axial force，pile-soil stress ratio，moments of piles and retaining structure increase with excavation，while the lateral frictional resistance and the vertical stress are less affected by excavation. The frictional resistance direction in the upper part of pile body is downward，and upward in the lower part. The position with the maximum value of retaining structure moment moves down step by step with excavation. The distance from the foundation pit determines the magnitude and the change form of pile bending moment. The pile top near foundation pit embeds cushion due to uneven settlement of piles and soil，and is constrained horizontally by cushion，which causes the negative moment in the upper part of the pile. Except that the replacement rate has little influence on the vertical stress of the soil between piles，all the above mechanical properties are decreased as the result of the increase of replacement rate，especially for the retaining structure moment，which indicates that the replacement rate of composite foundation can be increased to improve the mechanical properties of composite foundation and its support structure，and enhance the safety of lateral excavation.

Key words： pile foundations replacement rate internal force of excavation centrifugal model test composite foundation retaining structure

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	Articles by authors
	LI Lianxiang1
	2
	HUANG Jiajia1
	2
	CHENG Xiaoyang1
	2
	HU Feng1
	2
	FU Qinghong1
	2

Cite this article:

LI Lianxiang1,2,HUANG Jiajia1, et al. Centrifuge model tests on the interaction between rigid-pile composite foundation in the vicinity of a deep excavation and its retaining structure[J]. , 2017, 36(S2): 4142-4150.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0157 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS2/4142

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