scholarly journals Investigation of pile group effect subjected to influence of pile arrangement and pile stiffness

2016 ◽  
Vol 2 (38) ◽  
pp. 1362-1367
Author(s):  
Shuntaro Teramoto ◽  
Makoto Kimura
Keyword(s):  
Pile Group ◽  
Group Effect ◽  
Pile Arrangement ◽  
Pile Group Effect

Analysis of Vertical Bearing Capacity of Single-Row Pile Group of an Offshore Platform

2012 ◽  
Vol 188 ◽  
pp. 54-59
Author(s):  
Rui Hua Zhuo ◽  
Run Liu ◽  
Xin Li Wu ◽  
Yang Yang Zhao
Keyword(s):  
Bearing Capacity ◽  
Pile Group ◽  
Normal Operation ◽  
Deep Penetration ◽  
Group Model ◽  
Group Effect ◽  
Design Code ◽  
Vertical Bearing ◽  
Pile Group Effect ◽  
Vertical Bearing Capacity

The vertical bearing capacity of a special pile group of platform in an offshore gas field has been studied. Large diameter d (2.134 m), deep penetration l (96 m), small spacing sa (3.507 m), and only one row piles are the usual characteristics of the pile group foundation in offshore engineering. According to the requirements of the related design code, the super pile group effect has to be considered. However, with the usual design code, when sa/d, the ratio of spacing to diameter, is less than 2.0, there is no way to consider the pile group effect. In this paper, considering the occlusion effect of soil plug of pipe pile, several methods have been introduced to study the super pile group effect of the vertical bearing capacity. These methods include linear elastic theory method, the method recommended by the Code of Pile Foundation in Port Engineering (JTJ254-98), and the method with virtue of the existing pile group model test results. Meanwhile, the plugged and unplugged conditions have been considered, respectively. Through the analysis, the factors of safety in extreme and normal operation states are obtained, and the results satisfy the design specifications.

Interaction effects on load-carrying behavior of piled rafts embedded in clay from centrifuge tests

2015 ◽  
Vol 52 (10) ◽  
pp. 1550-1561 ◽  
Author(s):  
Donggyu Park ◽  
Junhwan Lee
Keyword(s):  
Pile Group ◽  
Interaction Effects ◽  
Group Effect ◽  
Piled Raft ◽  
Centrifuge Tests ◽  
Interaction Factor ◽  
Load Carrying ◽  
Lower Load ◽  
Load Tests ◽  
Pile Group Effect

In the present study, various interaction effects and load-carrying behavior of piled rafts embedded in clay were investigated. For this purpose, a series of centrifuge load tests were conducted using different types of model foundations, including single pile, group piles, piled raft, and unpiled raft. Different clay conditions were considered to prepare for centrifuge specimens. It was found that the pile group effect in clays is significant within initial loading range, showing lower load-carrying capacity. As settlement increases, the pile group effect becomes less pronounced. For both soft and stiff conditions, the values of the raft-to-pile (R-P) interaction factor varied initially, which became converged to some values around unity with increasing settlement. Similar tendency was observed for the pile-to-raft (P-R) interaction factor. The load responses of different pile components within the piled raft were not significantly different for the soft condition. For the stiff condition, the corner and inner piles showed the highest and lowest load-carrying capacities, respectively, due to piled-raft interaction effects. Correlations to cone resistance were analyzed and presented for the base and shaft resistances of piles for piled rafts.

scholarly journals Numerical evaluation of pile group effect of a composite group

2018 ◽  
Vol 58 (4) ◽  
pp. 1059-1067
Author(s):  
Youhao Zhou ◽  
Kohji Tokimatsu
Keyword(s):  
Numerical Evaluation ◽  
Pile Group ◽  
Group Effect ◽  
Pile Group Effect

scholarly journals Pile group effect on end bearing capacity and settlement of pile foundation

2008 ◽  
Vol 3 (1) ◽  
pp. 73-83
Author(s):  
Koichiro DANNO ◽  
Koichi ISOBE ◽  
Makoto KIMURA
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Pile Group ◽  
Group Effect ◽  
End Bearing Capacity ◽  
Pile Group Effect

scholarly journals EVALUATION ON PILE GROUP EFFECT OF UNDER-REAMED DIAPHRAGM-WALL-TYPE PILES SUPPORTING HIGH-RISE TOWER

2011 ◽  
Vol 17 (37) ◽  
pp. 855-860
Author(s):  
Atsuo KONISHI ◽  
Kazunari WATANABE ◽  
Naoko SUZUKI ◽  
Takao SEKI ◽  
Kiyoshi SATO ◽  
...  
Keyword(s):  
Pile Group ◽  
Diaphragm Wall ◽  
Group Effect ◽  
High Rise ◽  
Pile Group Effect

Group Effects of TLP Tendon Driven Piles in Normally Consolidated (NC) Clay

2014 ◽  
Author(s):  
Jianchun Cao
Keyword(s):  
Finite Element ◽  
Pile Group ◽  
Group Effect ◽  
Driven Piles ◽  
Pile Spacing ◽  
Axial Capacity ◽  
Lateral Capacity ◽  
Fea Model ◽  
Pile Group Effect ◽  
Group Effects

Long large-diameter driven piles (i.e., 2.0∼3.0m-diameter piles with a 100m penetration or deeper) have been usually used as Tension Leg Platforms’ (TLP) foundations in normally consolidated clay. In order to optimize a design, TLP designers would like to reduce the pile spacing, resulting in a pile group effect issue for pile geotechnical designers. This paper presents the development of a three-Dimensional Finite Element Analysis (3D FEA) model using Finite Element Code PLAXIS 3D to investigate the pile group effect of the TLP driven piles in normally consolidated clay. Using this model, a series of FEA runs were carried out. Firstly, the FEA model was used to examine the mobilization of axial capacity and the related group effect of a pile group, with various numbers of piles per group and different pile spacing. Secondly, the FEA model was used to investigate the group effects on the lateral capacity of a pile group, with respects of mobilization of lateral capacity, influence of loading direction, influence of pile spacing, and influence of number of piles in one group. These FEA results were also compared with the literature studies. Finally, recommendations on pile group effects for both axial capacity and lateral capacity were provided for TLP driven pile geotechnical designs in normally consolidated clay.

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