Characterizing Optimum Casing Configuration for Laterally Loaded Micropiles with Inclined Condition

Seongcheol Hong; Garam Kim; Incheol Kim; Jiyeong Lee; Junhwan Lee

doi:10.1007/s12205-022-1516-0

Characterizing Optimum Casing Configuration for Laterally Loaded Micropiles with Inclined Condition

Seongcheol Hong, Garam Kim, Incheol Kim, Jiyeong Lee, Junhwan Lee

Department of Civil and Environmental Engineering

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

1 Citation (Scopus)

Abstract

Micropile is vulnerable to lateral load due to the small diameter configuration. Inclusion of a steel casing can be an effective option to enhance the lateral load capacity of micropile, yet not quantified in detail. In this study, the reinforcing effect of casing for laterally loaded micropile is investigated considering the inclined condition of micropile. A series of the finite element analysis were performed to simulate laterally loaded micropiles for various configuration conditions. The maximum bending moment (M_max) and its location (Z_max) became smaller and shallower, respectively, when micropile was inclined at an angle of θ, which is advantageous in design. For micropile with a casing, the lateral load capacity (H_u) increased as casing length (L_c) increased, and the effect of θ was similar for all cases with different length ratios of casing and micropile (i.e., L_c/L_p). H_u increased by 50% to 60% for L_c/L_p of 0 to 0.3, respectively. For L_c/L_p > 0.3, the values of both H_u and M_max did not change significantly for all θs. Therefore, L_c/L_p = 0.3 was proposed as an optimum casing length that yields the most economical yet most enhanced stability condition. A design equation was proposed to estimate the lateral load capacity of inclined micropiles with a casing.

Original language	English
Pages (from-to)	3776-3788
Number of pages	13
Journal	KSCE Journal of Civil Engineering
Volume	26
Issue number	9
DOIs	https://doi.org/10.1007/s12205-022-1516-0
Publication status	Published - 2022 Sept

Bibliographical note

Funding Information:
This research was conducted with the support of the “National R&D Project for Smart Construction Technology (No. 22SMIP-A158708-03)” funded by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport, and managed by the Korea Expressway Corporation. It was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C201196613).

Publisher Copyright:
© 2022, Korean Society of Civil Engineers.

All Science Journal Classification (ASJC) codes

Civil and Structural Engineering

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10.1007/s12205-022-1516-0

Cite this

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title = "Characterizing Optimum Casing Configuration for Laterally Loaded Micropiles with Inclined Condition",

abstract = "Micropile is vulnerable to lateral load due to the small diameter configuration. Inclusion of a steel casing can be an effective option to enhance the lateral load capacity of micropile, yet not quantified in detail. In this study, the reinforcing effect of casing for laterally loaded micropile is investigated considering the inclined condition of micropile. A series of the finite element analysis were performed to simulate laterally loaded micropiles for various configuration conditions. The maximum bending moment (Mmax) and its location (Zmax) became smaller and shallower, respectively, when micropile was inclined at an angle of θ, which is advantageous in design. For micropile with a casing, the lateral load capacity (Hu) increased as casing length (Lc) increased, and the effect of θ was similar for all cases with different length ratios of casing and micropile (i.e., Lc/Lp). Hu increased by 50% to 60% for Lc/Lp of 0 to 0.3, respectively. For Lc/Lp > 0.3, the values of both Hu and Mmax did not change significantly for all θs. Therefore, Lc/Lp = 0.3 was proposed as an optimum casing length that yields the most economical yet most enhanced stability condition. A design equation was proposed to estimate the lateral load capacity of inclined micropiles with a casing.",

author = "Seongcheol Hong and Garam Kim and Incheol Kim and Jiyeong Lee and Junhwan Lee",

note = "Funding Information: This research was conducted with the support of the “National R&D Project for Smart Construction Technology (No. 22SMIP-A158708-03)” funded by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport, and managed by the Korea Expressway Corporation. It was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C201196613). Publisher Copyright: {\textcopyright} 2022, Korean Society of Civil Engineers.",

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AU - Lee, Junhwan

N1 - Funding Information: This research was conducted with the support of the “National R&D Project for Smart Construction Technology (No. 22SMIP-A158708-03)” funded by the Korea Agency for Infrastructure Technology Advancement under the Ministry of Land, Infrastructure and Transport, and managed by the Korea Expressway Corporation. It was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2020R1A2C201196613). Publisher Copyright: © 2022, Korean Society of Civil Engineers.

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N2 - Micropile is vulnerable to lateral load due to the small diameter configuration. Inclusion of a steel casing can be an effective option to enhance the lateral load capacity of micropile, yet not quantified in detail. In this study, the reinforcing effect of casing for laterally loaded micropile is investigated considering the inclined condition of micropile. A series of the finite element analysis were performed to simulate laterally loaded micropiles for various configuration conditions. The maximum bending moment (Mmax) and its location (Zmax) became smaller and shallower, respectively, when micropile was inclined at an angle of θ, which is advantageous in design. For micropile with a casing, the lateral load capacity (Hu) increased as casing length (Lc) increased, and the effect of θ was similar for all cases with different length ratios of casing and micropile (i.e., Lc/Lp). Hu increased by 50% to 60% for Lc/Lp of 0 to 0.3, respectively. For Lc/Lp > 0.3, the values of both Hu and Mmax did not change significantly for all θs. Therefore, Lc/Lp = 0.3 was proposed as an optimum casing length that yields the most economical yet most enhanced stability condition. A design equation was proposed to estimate the lateral load capacity of inclined micropiles with a casing.

AB - Micropile is vulnerable to lateral load due to the small diameter configuration. Inclusion of a steel casing can be an effective option to enhance the lateral load capacity of micropile, yet not quantified in detail. In this study, the reinforcing effect of casing for laterally loaded micropile is investigated considering the inclined condition of micropile. A series of the finite element analysis were performed to simulate laterally loaded micropiles for various configuration conditions. The maximum bending moment (Mmax) and its location (Zmax) became smaller and shallower, respectively, when micropile was inclined at an angle of θ, which is advantageous in design. For micropile with a casing, the lateral load capacity (Hu) increased as casing length (Lc) increased, and the effect of θ was similar for all cases with different length ratios of casing and micropile (i.e., Lc/Lp). Hu increased by 50% to 60% for Lc/Lp of 0 to 0.3, respectively. For Lc/Lp > 0.3, the values of both Hu and Mmax did not change significantly for all θs. Therefore, Lc/Lp = 0.3 was proposed as an optimum casing length that yields the most economical yet most enhanced stability condition. A design equation was proposed to estimate the lateral load capacity of inclined micropiles with a casing.

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Characterizing Optimum Casing Configuration for Laterally Loaded Micropiles with Inclined Condition

Abstract

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