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

Department of Civil and Environmental Engineering

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

6 Citations (Scopus)

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
Publication status	Published - 2021 Apr

Bibliographical note

Funding Information:
This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA); the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) and the National Research Foundation of Korea (NRF) (Nos. 20SMIP-A158708-01; 20194030202460 and 2020R1A2C2011966).

Publisher Copyright:
© 2021 Elsevier Ltd

All Science Journal Classification (ASJC) codes

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.",

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

note = "Funding Information: This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA); the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) and the National Research Foundation of Korea (NRF) (Nos. 20SMIP-A158708-01; 20194030202460 and 2020R1A2C2011966). Publisher Copyright: {\textcopyright} 2021 Elsevier Ltd",

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AU - Lee, Junhwan

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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.

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

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