Numerical analysis of the deep soil failure mechanism for perimeter pile groups

2022 ◽  
Vol 12 (1) ◽  
pp. 1-26
Author(s):  
M. Watford ◽  
J. Templeman ◽  
Z. Orazalin ◽  
H. Zhou ◽  
A. Franza ◽  
...  
Keyword(s):  
Finite Element ◽  
Failure Mechanism ◽  
Pile Groups ◽  
Deep Soil ◽  
Pile Spacing ◽  
Lateral Capacity ◽  
Soil Failure ◽  
Dimensional Finite Element ◽  
Group Configuration

In this paper, the lateral limiting pressure offered by the deep ‘flow-around’ soil failure mechanism for perimeter (ring) pile groups in undrained soil is explored using two−dimensional finite element modelling. A parametric study investigates the role of group configuration, pile−soil adhesion, group size, pile spacing and load direction on group capacity and corresponding soil failure mechanisms. The finite element output show that the plan group configuration (square or circular) has a negligible influence on lateral capacity for closely spaced perimeter pile groups. When compared to ‘full’ square pile groups with the same number of piles, the present results suggest that for practical pile spacing (≳ two pile diameters), perimeter groups do not necessarily increase capacity efficiency, particularly if the piles are smooth. Nevertheless, perimeter groups are shown to be characterized by both the invariance of their capacity to the direction of loading and their highly uniform load-sharing between piles, which are beneficial features to optimize design.

Mechanical Simulation of Knee Movement in Basketball Shooting

2013 ◽  
Vol 336-338 ◽  
pp. 760-763
Author(s):  
Hui Yue
Keyword(s):  
Finite Element ◽  
Cruciate Ligament ◽  
Three Dimensional ◽  
Element Model ◽  
Basketball Player ◽  
Knee Movement ◽  
Dimensional Finite Element ◽  
Anterior Cruciate ◽  
Three Dimensional Finite Element

A short explanation of the finite element method as a powerful tool for mathematical modeling is provided, and an application using constitutive modeling of the behavior of ligaments is introduced. Few possible explanations of the role of water in ligament function are extracted from two dimensional finite element models of a classical ligament. The modeling is extended to a three dimensional finite element model for the human anterior cruciate ligament. Simulation of ligament force in pitching motion of basketball player is studied in this paper.

3D Finite Element Analysis of Negative Skin Friction (NSF) Behaviors in Pile Groups with Cap

2013 ◽  
Vol 405-408 ◽  
pp. 390-395
Author(s):  
Li Nong Xia ◽  
Hai Tao Hu ◽  
Yun Dong Miao ◽  
Chang Bin Liao
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Neutral Point ◽  
Pile Groups ◽  
Element Analysis ◽  
Negative Skin Friction ◽  
Pile Cap ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Level Lowering

The pile-soil interactions are constrained by the pile cap in pile groups with cap, while mutually independent in pile groups without cap. The mechanism of changing of NSF in pile groups with cap are analyzed briefly. The NSF behaviors of pile groups with cap under the condition of groundwater level lowering are analyzed by three-dimensional finite element method. The analysis shows that the NSF of pile groups with cap is generally similar to that of a single pile: as the working loads on cap increasing, the neutral point moves up, additional settlement increases and the downdrag decreases, though there are differences between piles in different positions. The constraints of settlement of piles in various positions by the cap are significant when the working load is not large, so that the neutral point of piles are almost coincident. As the working load increasing, the deformation of the cap increases and the neutral point of piles become more various, lowest for the corner pile, second for the perimeter pile and highest for the interior pile. The NSF of each pile in pile groups with cap mobilizes differently along the depth. It is mobilized most fully for the corner pile, second for the perimeter pile and least for the interior pile.

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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