Assessing the penetration resistance acting on a dynamically installed anchor in normally consolidated and overconsolidated clay

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Predicting the final embedment depth of a dynamically installed anchor is a key prerequisite for reliable calculation of anchor capacity. This paper investigates the embedment characteristics of dynamically installed anchors in normally consolidated and overconsolidated clay through a series of centrifuge tests involving a model anchor instrumented with a microelectric mechanical system (MEMS) accelerometer, enabling the full motion response of the anchor to be established. The data are used to assess the performance of an anchor embedment model based on strain-rate-dependent shearing resistance and fluid mechanics drag resistance. Predictions of a database of over 100 anchor installations — formed from this study and the literature — result in calculated anchor embedment depths that are within ±15% of the measurements. An interesting aspect, consistent across the entire database, relates to the strain rate dependence on frictional resistance relative to bearing resistance. The predictions reveal that strain rate dependency may indeed be higher for frictional resistance, although only if a soil strength lower than the fully remoulded strength is considered as the reference strength, which suggests that water may be entrained along a boundary layer at the anchor–soil interface during installation.
Original languageEnglish
Pages (from-to)1-17
Number of pages17
JournalCanadian Geotechnical Journal
Volume54
Issue number1
DOIs
Publication statusPublished - Jan 2017

Fingerprint

Anchors
anchor
Clay
penetration
clay
strain rate
Strain rate
Bearings (structural)
fluid mechanics
soil strength
accelerometer
Fluid mechanics
Centrifuges
centrifuge
prediction
Accelerometers
Shearing
drag
Drag
Boundary layers

Cite this

@article{2a3460957d1d47978998dad55ea088c9,
title = "Assessing the penetration resistance acting on a dynamically installed anchor in normally consolidated and overconsolidated clay",
abstract = "Predicting the final embedment depth of a dynamically installed anchor is a key prerequisite for reliable calculation of anchor capacity. This paper investigates the embedment characteristics of dynamically installed anchors in normally consolidated and overconsolidated clay through a series of centrifuge tests involving a model anchor instrumented with a microelectric mechanical system (MEMS) accelerometer, enabling the full motion response of the anchor to be established. The data are used to assess the performance of an anchor embedment model based on strain-rate-dependent shearing resistance and fluid mechanics drag resistance. Predictions of a database of over 100 anchor installations — formed from this study and the literature — result in calculated anchor embedment depths that are within ±15{\%} of the measurements. An interesting aspect, consistent across the entire database, relates to the strain rate dependence on frictional resistance relative to bearing resistance. The predictions reveal that strain rate dependency may indeed be higher for frictional resistance, although only if a soil strength lower than the fully remoulded strength is considered as the reference strength, which suggests that water may be entrained along a boundary layer at the anchor–soil interface during installation.",
author = "C. O'Beirne and C. O'Loughlin and C. Gaudin",
year = "2017",
month = "1",
doi = "10.1139/cgj-2016-0111",
language = "English",
volume = "54",
pages = "1--17",
journal = "Canadian Geotechnical Journal",
issn = "0008-3674",
publisher = "CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS",
number = "1",

}

TY - JOUR

T1 - Assessing the penetration resistance acting on a dynamically installed anchor in normally consolidated and overconsolidated clay

AU - O'Beirne, C.

AU - O'Loughlin, C.

AU - Gaudin, C.

PY - 2017/1

Y1 - 2017/1

N2 - Predicting the final embedment depth of a dynamically installed anchor is a key prerequisite for reliable calculation of anchor capacity. This paper investigates the embedment characteristics of dynamically installed anchors in normally consolidated and overconsolidated clay through a series of centrifuge tests involving a model anchor instrumented with a microelectric mechanical system (MEMS) accelerometer, enabling the full motion response of the anchor to be established. The data are used to assess the performance of an anchor embedment model based on strain-rate-dependent shearing resistance and fluid mechanics drag resistance. Predictions of a database of over 100 anchor installations — formed from this study and the literature — result in calculated anchor embedment depths that are within ±15% of the measurements. An interesting aspect, consistent across the entire database, relates to the strain rate dependence on frictional resistance relative to bearing resistance. The predictions reveal that strain rate dependency may indeed be higher for frictional resistance, although only if a soil strength lower than the fully remoulded strength is considered as the reference strength, which suggests that water may be entrained along a boundary layer at the anchor–soil interface during installation.

AB - Predicting the final embedment depth of a dynamically installed anchor is a key prerequisite for reliable calculation of anchor capacity. This paper investigates the embedment characteristics of dynamically installed anchors in normally consolidated and overconsolidated clay through a series of centrifuge tests involving a model anchor instrumented with a microelectric mechanical system (MEMS) accelerometer, enabling the full motion response of the anchor to be established. The data are used to assess the performance of an anchor embedment model based on strain-rate-dependent shearing resistance and fluid mechanics drag resistance. Predictions of a database of over 100 anchor installations — formed from this study and the literature — result in calculated anchor embedment depths that are within ±15% of the measurements. An interesting aspect, consistent across the entire database, relates to the strain rate dependence on frictional resistance relative to bearing resistance. The predictions reveal that strain rate dependency may indeed be higher for frictional resistance, although only if a soil strength lower than the fully remoulded strength is considered as the reference strength, which suggests that water may be entrained along a boundary layer at the anchor–soil interface during installation.

U2 - 10.1139/cgj-2016-0111

DO - 10.1139/cgj-2016-0111

M3 - Article

VL - 54

SP - 1

EP - 17

JO - Canadian Geotechnical Journal

JF - Canadian Geotechnical Journal

SN - 0008-3674

IS - 1

ER -