Characterizing uplift load capacity of micropiles embedded in soil and rock considering inclined installation conditions

Qaisar Abbas; Wonseok Choi; Garam Kim; Incheol Kim; Junhwan Lee

doi:10.1016/j.compgeo.2020.103995

Characterizing uplift load capacity of micropiles embedded in soil and rock considering inclined installation conditions

Qaisar Abbas, Wonseok Choi, Garam Kim, Incheol Kim, Junhwan Lee^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

In this study, the uplift load-carrying behavior of inclined micropiles (MP) embedded in various soil-rock layer conditions was investigated. For this purpose, a series of model load tests and finite element analyses were performed. The focus was given on the effects of MP inclination angle (θ) and rock-embedded ratio (Z_r/L). For MPs in rock, the uplift load capacity (Q_u,θ) was highest when vertically installed and decreased with increasing θ. The Q_u,θ of MPs embedded in soil-rock mixed layers increased with Z_r/L and decreased with increasing θ. Marked increases in Q_u,θ were observed for Z_r/L larger than 0.6 for all θs. As MPs inclination increased, the load-carrying mechanism shifted from the frictional resistance towards the passive resistance. The MPs inclined configuration caused less mobilization of the frictional resistance within the rock-embedded zone while producing the passive resistance within the upper soil zone. This explained the reductions in Q_u,θ with increasing θ for MPs with the rock-embedded condition.

Original language	English
Article number	103995
Journal	Computers and Geotechnics
Volume	132
DOIs	https://doi.org/10.1016/j.compgeo.2020.103995
State	Published - Apr 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

Frictional resistance
Inclination angle
Micropiles
Rock embedded ratio
Uplift load capacity

ASJC Scopus subject areas

Geotechnical Engineering and Engineering Geology
Computer Science Applications

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10.1016/j.compgeo.2020.103995

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title = "Characterizing uplift load capacity of micropiles embedded in soil and rock considering inclined installation conditions",

abstract = "In this study, the uplift load-carrying behavior of inclined micropiles (MP) embedded in various soil-rock layer conditions was investigated. For this purpose, a series of model load tests and finite element analyses were performed. The focus was given on the effects of MP inclination angle (θ) and rock-embedded ratio (Zr/L). For MPs in rock, the uplift load capacity (Qu,θ) was highest when vertically installed and decreased with increasing θ. The Qu,θ of MPs embedded in soil-rock mixed layers increased with Zr/L and decreased with increasing θ. Marked increases in Qu,θ were observed for Zr/L larger than 0.6 for all θs. As MPs inclination increased, the load-carrying mechanism shifted from the frictional resistance towards the passive resistance. The MPs inclined configuration caused less mobilization of the frictional resistance within the rock-embedded zone while producing the passive resistance within the upper soil zone. This explained the reductions in Qu,θ with increasing θ for MPs with the rock-embedded condition.",

keywords = "Frictional resistance, Inclination angle, Micropiles, Rock embedded ratio, Uplift load capacity",

author = "Qaisar Abbas and Wonseok Choi and Garam Kim and Incheol Kim and Junhwan Lee",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

year = "2021",

month = apr,

doi = "10.1016/j.compgeo.2020.103995",

language = "English",

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journal = "Computers and Geotechnics",

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AU - Abbas, Qaisar

AU - Choi, Wonseok

AU - Kim, Garam

AU - Kim, Incheol

AU - Lee, Junhwan

PY - 2021/4

Y1 - 2021/4

N2 - In this study, the uplift load-carrying behavior of inclined micropiles (MP) embedded in various soil-rock layer conditions was investigated. For this purpose, a series of model load tests and finite element analyses were performed. The focus was given on the effects of MP inclination angle (θ) and rock-embedded ratio (Zr/L). For MPs in rock, the uplift load capacity (Qu,θ) was highest when vertically installed and decreased with increasing θ. The Qu,θ of MPs embedded in soil-rock mixed layers increased with Zr/L and decreased with increasing θ. Marked increases in Qu,θ were observed for Zr/L larger than 0.6 for all θs. As MPs inclination increased, the load-carrying mechanism shifted from the frictional resistance towards the passive resistance. The MPs inclined configuration caused less mobilization of the frictional resistance within the rock-embedded zone while producing the passive resistance within the upper soil zone. This explained the reductions in Qu,θ with increasing θ for MPs with the rock-embedded condition.

AB - In this study, the uplift load-carrying behavior of inclined micropiles (MP) embedded in various soil-rock layer conditions was investigated. For this purpose, a series of model load tests and finite element analyses were performed. The focus was given on the effects of MP inclination angle (θ) and rock-embedded ratio (Zr/L). For MPs in rock, the uplift load capacity (Qu,θ) was highest when vertically installed and decreased with increasing θ. The Qu,θ of MPs embedded in soil-rock mixed layers increased with Zr/L and decreased with increasing θ. Marked increases in Qu,θ were observed for Zr/L larger than 0.6 for all θs. As MPs inclination increased, the load-carrying mechanism shifted from the frictional resistance towards the passive resistance. The MPs inclined configuration caused less mobilization of the frictional resistance within the rock-embedded zone while producing the passive resistance within the upper soil zone. This explained the reductions in Qu,θ with increasing θ for MPs with the rock-embedded condition.

KW - Frictional resistance

KW - Inclination angle

KW - Micropiles

KW - Rock embedded ratio

KW - Uplift load capacity

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DO - 10.1016/j.compgeo.2020.103995

M3 - Article

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SN - 0266-352X

VL - 132

JO - Computers and Geotechnics

JF - Computers and Geotechnics

M1 - 103995

ER -

Characterizing uplift load capacity of micropiles embedded in soil and rock considering inclined installation conditions

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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