Settlement calculation of composite foundation with concrete-cored DCM pile under rigid foundation

被引：0
|
作者：
Yu J. [1 ,2 ]
Xu S. [1 ,2 ]
Yang X. [1 ,2 ]
Chen Z. [1 ,2 ]
Gong X. [1 ,2 ]
机构：
[1] Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou
[2] Zhejiang Urban Underground Space Development Engineering Research Center, Hangzhou
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2020年 / 51卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Composite foundation; Concrete-cored DCM pile; Load transfer method; Relative displacement of interface; Settlement;
D O I：
10.11817/j.issn.1672-7207.2020.08.007
中图分类号：
学科分类号：
摘要：
In order to calculate the settlement of composite foundation and study the relevant influencing factors, firstly, the influence of the interface relative displacement on the side friction resistance of the interfaces was considered, and the ideal elastic-plastic load transfer function was obtained. Secondly, according to the basic principle of load transfer method, the equilibrium differential equation of the concrete core, cement soil pile and soil around the pile were established respectively, and the corresponding expressions of stress and displacement were obtained. Finally, the reliability of the method was verified by comparing with the results of numerical simulation, and the influence of upper load, core ratio, area displacement ratio, soil around the pile and underlying layer compression modulus on the settlement amount of composite foundation was analyzed. The results show that in concrete-cored DCM pile composite foundation under rigid foundation, the concrete core bears most of the upper load, followed by the cement soil pile, and the load sharing ratio of the soil around the pile is the smallest. With the increase of the load, the load sharing ratio of concrete core decreases gradually, the load sharing ratio of the soil around the pile and the cement soil pile gradually increases, and the load is gradually transferred from concrete core to the cement soil pile and the soil around the pile. With the decrease of the upper load, the core ratio, area replacement ratio, the compression modulus of the soil around the pile and underlying layer increase, and the settlement amount of the composite foundation gradually decreases, among which the influence of the core ration is relatively small. Except for the compression modulus of the underlying layer, the degree of influence of various factors on the compression of soil around the pile is significantly greater than that of the underlying soil. © 2020, Central South University Press. All right reserved.
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页码：2111 / 2120
页数：9
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