Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

The responses of model piles in a liquefiable ground under one- and two-dimensional shakings were studied in a physical model test using a large biaxial laminar shear box on the shaking table at the National Center for Research on Earthquake Engineering (NCREE), Taiwan. The model piles were made of stainless steel pipe and aluminum alloy pipe with an outer diameter of 101.6 mm and a wall thickness of 3.0 mm for the study of the soil-pile interactions with two kinds of stiffness of pile. Each model pile was placed in the shear box containing saturated clean fine sand. The pile tip was fixed at the bottom of the shear box to simulate the condition of a pile foundation embedded in a firm stratum. In addition, various amounts of masses were placed on the top of the piles for different conditions of superstructures. The input shakings included sinusoidal and recorded earthquake accelerations. Strain gauges and accelerometers were placed on the pile surface to obtain the behavior of the pile under shaking. The near- and far-field soil responses, including pore water pressure changes, accelerations, and settlements were also measured. The responses of the model pile and the soil-pile interactions, including the inertial and kinematic actions on the model pile, under shakings for liquefied and non-liquefied soil conditions were evaluated. The results showed that the stiffness of the soil vanished when soil liquefaction occurred. The performance of the pile foundation was affected by the relation among the dynamic characteristics of the pile and the surrounding soil, and the mass of the superstructure.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Behavior of Model Piles in a Liquefiable Soil in Shaking Table Tests

San Diego, California

The responses of model piles in a liquefiable ground under one- and two-dimensional shakings were studied in a physical model test using a large biaxial laminar shear box on the shaking table at the National Center for Research on Earthquake Engineering (NCREE), Taiwan. The model piles were made of stainless steel pipe and aluminum alloy pipe with an outer diameter of 101.6 mm and a wall thickness of 3.0 mm for the study of the soil-pile interactions with two kinds of stiffness of pile. Each model pile was placed in the shear box containing saturated clean fine sand. The pile tip was fixed at the bottom of the shear box to simulate the condition of a pile foundation embedded in a firm stratum. In addition, various amounts of masses were placed on the top of the piles for different conditions of superstructures. The input shakings included sinusoidal and recorded earthquake accelerations. Strain gauges and accelerometers were placed on the pile surface to obtain the behavior of the pile under shaking. The near- and far-field soil responses, including pore water pressure changes, accelerations, and settlements were also measured. The responses of the model pile and the soil-pile interactions, including the inertial and kinematic actions on the model pile, under shakings for liquefied and non-liquefied soil conditions were evaluated. The results showed that the stiffness of the soil vanished when soil liquefaction occurred. The performance of the pile foundation was affected by the relation among the dynamic characteristics of the pile and the surrounding soil, and the mass of the superstructure.