TY - JOUR
T1 - Characterizing uplift load capacity of micropiles embedded in soil and rock considering inclined installation conditions
AU - Abbas, Qaisar
AU - Choi, Wonseok
AU - Kim, Garam
AU - Kim, Incheol
AU - Lee, Junhwan
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
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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U2 - 10.1016/j.compgeo.2020.103995
DO - 10.1016/j.compgeo.2020.103995
M3 - Article
AN - SCOPUS:85100082620
SN - 0266-352X
VL - 132
JO - Computers and Geotechnics
JF - Computers and Geotechnics
M1 - 103995
ER -