Finite element prediction on the response of non-uniformly arranged pile groups considering progressive failure of pile-
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RESEARCH ARTICLE
Finite element prediction on the response of non-uniformly arranged pile groups considering progressive failure of pile-soil system Qian-Qing ZHANGa,b* , Shan-Wei LIUa, Ruo-Feng FENGa, Jian-Gu QIANb, Chun-Yu CUIa a
Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China b
*
Corresponding author. E-mail: [email protected]
© Higher Education Press 2020
ABSTRACT A uniform arrangement of individual piles is commonly adopted in the conventional pile group foundation, and basin-shaped settlement is often observed in practice. Large differential settlement of pile groups will decrease the use-safety requirements of building, even cause the whole-building tilt or collapse. To reduce differential settlement among individual piles, non-uniformly arranged pile groups can be adopted. This paper presents a finite element analysis on the response of pile groups with different layouts of individual piles in pile groups. Using the userdefined subroutine FRIC as the secondary development platform, a softening model of skin friction and a hyperbolic model of end resistance are introduced into the contact pair calculation of ABAQUS software. As to the response analysis of a single pile, the reliability of the proposed secondary development method of ABAQUS software is verified using an iterative computer program. The reinforcing effects of individual piles is then analyzed using the present finite element analysis. Furthermore, the response of non-uniformly arranged pile groups, e.g., individual piles with variable length and individual piles with variable diameter, is analyzed using the proposed numerical analysis method. Some suggestions on the layout of individual piles are proposed to reduce differential settlement and make full use of the bearing capacity of individual piles in pile groups for practical purposes. KEYWORDS
1
numerical simulation, non-uniformly arranged pile groups, differential settlement, pile-soil interaction
Introduction
In the conventional pile group foundation, a uniform arrangement of individual piles is commonly adopted according to the entire load of superstructure and the designed bearing capacity of each individual pile, and basin-shaped settlement is often observed in practice [1–4]. Previous studies [5–7] showed that the settlement of individual piles installed at the central part of pile groups is larger than that installed at the peripheral part of pile groups due to the interactive effects among individual piles, leading to basin-shaped settlement of pile groups. Large differential settlement of pile groups will decrease the use-safety requirements of building, even cause the Article history: Received May 28, 2019; Accepted Jul 18, 2019
whole-building tilt or collapse. The researchers always focus on the optimum design of layout of pile groups to reduce differential settlement and make full use of the bearin
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