Influence of pile spacing on seismic response of piled raft in soft clay: centrifuge modeling

2019 ◽  
Vol 18 (4) ◽  
pp. 719-733 ◽  
Author(s):  
Jun Yang ◽  
Min Yang ◽  
Haibing Chen
Keyword(s):  
Seismic Response ◽  
Soft Clay ◽  
Centrifuge Modeling ◽  
Pile Spacing ◽  
Piled Raft

Seismic Response Characteristics of a Piled Raft in Clay

2019 ◽  
Vol 13 (01) ◽  
pp. 1950005 ◽  
Author(s):  
Ramon Varghese ◽  
A. Boominathan ◽  
Subhadeep Banerjee
Keyword(s):  
Seismic Response ◽  
Shaking Table Test ◽  
Interaction Analysis ◽  
Dynamic Stiffness ◽  
Shaking Table ◽  
Dimensionless Frequency ◽  
Soil System ◽  
Pile Spacing ◽  
Piled Raft ◽  
Axial Forces

This paper presents a study on three-dimensional seismic soil–structure interaction analysis of a piled-raft (PR) foundation in clay by the substructure approach. Two different pile modeling techniques were adopted and compared with centrifuge shaking table test results reported in the literature. The effect of pile spacing on dynamic impedances, kinematic response parameters, axial pile forces and bending moments of PRs is studied. It is found that the presence of a rigid raft on a pile group results in significant variation in vertical and horizontal dynamic stiffness after a dimensionless frequency ([Formula: see text] value of around 0.22. The influence of raft on kinematic response parameters at the top of raft is found to be significantly influenced by pile spacing beyond a dimensionless frequency ([Formula: see text] value of 0.4. The axial forces generated at the pile heads of a PR–structure system during seismic shaking are quantified using a new dimensionless factor, and are found to be significantly influenced by the pile spacing. Pile layout in the PR system is found to play an influential role in seismic response as well as pile bending moment for a structure–PR–soil system studied.

Centrifuge modeling of seismic response of layered soft clay

2007 ◽  
Vol 5 (4) ◽  
pp. 571-589 ◽  
Author(s):  
M. H. T. Rayhani ◽  
M. H. El Naggar
Keyword(s):  
Seismic Response ◽  
Soft Clay ◽  
Centrifuge Modeling

3D numerical analysis of piled raft interaction in drained soft clay conditions

2021 ◽  
Vol 14 (5) ◽  
Author(s):  
Abdelkrim Ferchat ◽  
Sadok Benmebarek ◽  
Mohamed Nabil Houhou
Keyword(s):  
Numerical Analysis ◽  
Soft Clay ◽  
Piled Raft

scholarly journals 3D Numerical Modeling of Large Piled-Raft Foundation on Clayey Soils for Different Loadings and Pile-Raft Configurations

2020 ◽  
Vol 42 (1) ◽  
pp. 1-17
Author(s):  
Shivanand Mali ◽  
Baleshwar Singh
Keyword(s):  
Numerical Modeling ◽  
Soil Profile ◽  
Bending Moment ◽  
Load Sharing ◽  
3D Numerical Modeling ◽  
Interface Elements ◽  
Pile Spacing ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation

AbstractIn a piled-raft foundation, the interaction between structural elements and soil continuum can be simulated very precisely by numerical modeling. In the present study, 3D finite element model has been used to examine the settlement, load-sharing, bending moment, and shear force behavior of piled-raft foundation on different soil profiles for different load configurations and pile-raft configurations (PRCs). The model incorporates the pile-to-soil and raft-to-soil interactions by means of interface elements. The effect of parameters such as pile spacing and raft thickness are also studied. For any soil profile, larger pile spacing is observed to be more efficient in reducing the average settlement and enhancing the load-sharing coefficient. The smaller pile spacing is observed to be efficient in reducing the differential settlement. For any soil profile, the behavior of piled-raft foundation is significantly affected by the PRCs and load configurations. Furthermore, the raft thickness has significant effect on settlement, bending moment, and shears force. Thus, the results of the present study can be used as guidelines for analyzing and designing large piled-raft foundation.

Piled Raft Structure Finite Element Analysis of Composite Foundation Settlement in Da XI Passenger Dedicated Line

2014 ◽  
Vol 937 ◽  
pp. 438-443
Author(s):  
Xiao Tong Ma ◽  
Guang Long Liu
Keyword(s):  
Finite Element ◽  
Composite Foundation ◽  
Foundation Settlement ◽  
Pile Spacing ◽  
Finite Element Software ◽  
Piled Raft ◽  
Pile Diameter ◽  
Foundation Treatment ◽  
Pile Length ◽  
Passenger Dedicated Line

Composite foundation settlement of piled raft structure in Da Xi passenger dedicated line is analyzed by the large finite element software MIDAS/GTS and established calculation model of foundation treatment. The problem of pile-soil contact is highlighted in the trail and analyzes the settlement nephogram and pile-soil stress nephogram. On this basis the foundation settlement factors was analyzed systematically that focus on the elastic modulus of pile, pile spacing, pile diameter and pile length in foundation treatment, especially for the characteristics parameters of contact element. Result shows that increasing the pile modulus, pile diameter, pile length and decreasing the pile spacing is all conducive to reducing settlement. The best advice is got that the pile diameter should be not more than 0.5m, pile length not more than 27m and the pile spacing be around 2m.

Effect of Superstructure on the Dynamic Response of Nonconnected Piled Raft Foundation Using Centrifuge Modeling

2018 ◽  
Vol 18 (10) ◽  
pp. 04018126 ◽  
Author(s):  
Mohammad Hassan Baziar ◽  
Fahime Rafiee ◽  
Chung Jung Lee ◽  
Alireza Saeedi Azizkandi
Keyword(s):  
Dynamic Response ◽  
Centrifuge Modeling ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation
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