Analyses of Penetration Resistance and Mechanism of Spudcan Foundations in Double-Layered Soil

被引：0
|
作者：
Fan Q. [1 ,2 ]
Su Y. [1 ]
Zhang B. [1 ]
机构：
[1] Key Laboratory of Geotechnical Engineering, Ludong University, Yantai
[2] College of Civil and Transportation Engineering, Hohai University, Nanjing
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2020年 / 28卷 / 02期
关键词：
Coupled Eulerian-Lagrangian method; Large deformation analyses; Layered soil; Penetration resistance; Progressive softening; Punch-through failure; Spudcan foundation;
D O I：
10.16058/j.issn.1005-0930.2020.02.018
中图分类号：
学科分类号：
摘要：
Utilizing three-dimensional CEL (Coupled Eulerian-Lagrangian) finite element method, the penetration responses of spudcan foundation was numerically simulated into sand overlying clay and strong over soft clay.To accounting for the effect of progressive softening behavior of clay crust on the penetration mechanisms of spudcan footings, the empirical strain-softening law of undrained strength of clay crust and elastic-perfectly plastic model using Tresca yield criteria was combined and numerically implemented into the finite element package ABAQUS.The effects on the penetration resistance curve were studied of the ratio of the upper layer thickness to the spudcan diameter, the internal friction angle of sand, and the strain-softening parameter of undrained strength of clay crust.The soil deformation patterns of punch-through failure during spudcan penetration were analysed.The results presented in this paper show that the ratio of the upper layer thickness to the spudcan diameter significantly affects the penetration resistance of spudcan footings.The potential for punch-through failure during spudcan penetration may be reduced due to the strain-softening behavior of clay crust.With the increasing penetration depth, a hopper-shaped footprint appears on top of the spudcan in sand over clay, however a footprint of inverted bottomless beer bottle shape is developed in strong over soft clay. © 2020, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：452 / 459
页数：7
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