An alternative mechanism of pile failure in liquefiable deposits during earthquakes

Bhattacharya, Subhamoy; Madabhushi, Spg; Bolton, M. D.

doi:10.1680/geot.54.3.203.36349

Cited by 12 publications

(2 citation statements)

References 8 publications

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“…In contrast to the bending failure mechanism, investigations carried out by Bhattacharya et al [19], Lin et al [20], Kimura and Tokimatsu [21], Shanker et al [22], Bhattacharya et al [23] and Knappett and Madabhushi [24] have demonstrated that when soil liquefies and loses much of its stiffness, end-bearing piles act as unsupported long slender columns and may buckle under the action of the axial load arising from the dead load of the superstructure. A comprehensive critical review of the current theories of pile failures and hypothesis behind the current codes of practice may be found in [25].…”

Section: Introductionmentioning

confidence: 99%

Modal analysis of pile‐supported structures during seismic liquefaction

Lombardi

Bhattacharya

2013

Earthq Engng Struct Dyn

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The purpose of this paper is to investigate the effects of liquefaction on modal parameters (frequency and damping) of pile-supported structures. Four physical models, consisting of two single piles and two 2 × 2 pile groups, were tested in a shaking table where the soil surrounding the pile liquefied because of seismic shaking. The experimental results showed that the natural frequency of pile-supported structures may decrease considerably owing to the loss of lateral support offered by the soil to the pile. On the other hand, the damping ratio of structure may increase to values in excess of 20%. These findings have important design consequences: (a) for low-period structures, substantial reduction of spectral acceleration is expected; (b) during and after liquefaction, the response of the system may be dictated by the interactions of multiple loadings, that is, horizontal, axial and overturning moment, which were negligible prior to liquefaction; and (c) with the onset of liquefaction due to increased flexibility of pile-supported structure, larger spectral displacement may be expected, which in turn may enhance P-delta effects and consequently amplification of overturning moment. Practical implications for pile design are discussed

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Section: Introductionmentioning

confidence: 99%

Modal analysis of pile‐supported structures during seismic liquefaction

Lombardi

Bhattacharya

2013

Earthq Engng Struct Dyn

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“…Figure 2. Schematic Diagram for Pile Failure(Bhattacharya, 2003)Bhattacharya et al (2004), investigated the behavior of 14 pile foundation system in liquefiable soils with 1/50 g centrifuge tests. In tests, tank with dimensions of 560 mm x 235 mm x 220 mm and aluminium piles with outer diameter of 9,3 mm and inner diameter of 8,5 mm are used.…”

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Investigation of Structural Behavior of Piles in Liquefiable Cohesionless Soils

BAŞAR

ÇELİK

Uzundurukan

et al. 2022

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Piled foundation design and behaviour under static and dynamic loading (wave motion, earthquake, wind, vibration loadings of machinery) conditions are study subjects that are focus of interest recently in the geotechnical engineering applications. Liquefaction can be described as strength and stiffness loss of a loose, saturated non-cohesive soil under undrained cyclic loading as a result of increasing pore water pressures which reduce effective stress. Large deformations and lateral flow occurring in the layers of liquefied soil during earthquake could lead to strength and stiffness lose which may result with pile buckling and considerably increased earthquake damage on the superstructure. Predicting the bearing capacity and the deformation shape of the piled foundations during the earthquake is essential for the economy and the structural safety of the design. In this study model pile tests are conducted in uniform sandy soil and pile structural capacity is investigated under the effects of relative density and degree of saturation of surrounding soil, and pile embedment depth. Steel rods were used to represent the piles in the model tests. Sand soil was placed in a cylindirical tank at different thicknesses to provide for different pile embedment depths. Soils were compacted at four different compaction level to provide relative densities in the range of 45-80%. Static incremental load has been applied on the upper plate of the pile system in the tests. While the increase in the relative density affects the structural capacity of the piles positively, surrounding soil being saturated has resulted with capacity losses. Experimental results show that there is a consistency between our experimental findings and literature about deformation shape and buckling length of piles in liquified soils.

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Buckling of Piles under Liquefied Soil Conditions

2006

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The paper pertains to the analysis of piles embedded in liquefiable soils to predict its' critical buckling load under partial to full loss of lateral support over a portion of the pile length. The analysis is based on extension of Mindlin solution for a point load acting inside a semi infinite elastic half space. Degenerated solutions obtained by using the developed method compares very well with reported results. Parametric studies showed that the depth of liquefiable soil, degradation of soil strength on liquefaction, slenderness ratio, pile stiffness factor and end conditions have significant influence on the buckling behavior of the piles.

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An alternative mechanism of pile failure in liquefiable deposits during earthquakes

Cited by 12 publications

References 8 publications

Modal analysis of pile‐supported structures during seismic liquefaction

Modal analysis of pile‐supported structures during seismic liquefaction

Investigation of Structural Behavior of Piles in Liquefiable Cohesionless Soils

Buckling of Piles under Liquefied Soil Conditions

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