Compressive Load-Carrying Behavior of Inclined Micropiles Installed in Soil and Rock Layers

Wonseok Choi, Garam Kim, Incheol Kim, Doohyun Kyung, Junhwan Lee

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6 Citations (Scopus)


Micropiles are an effective option to enhance the load-carrying performance of buildings and infrastructure. In this study, the compressive load capacity and load-carrying mechanism of inclined micropiles in soil and rock layers were investigated experimentally and analytically. A series of model load tests was conducted using model micropiles and rock specimens. The finite element analyses were performed for inclined micropiles in various soil-rock layer configurations. Vertical micropiles in rock exhibited the highest load-carrying capacity whereas inclined conditions were not beneficial. For the rock-mounted condition, the base capacity dominated the total load capacity when the inclination was lower than 15°. For partially and fully rock-embedded conditions, the main load-carrying component was the skin friction and virtually no load was transferred to the micropile base. Micropile inclination caused less mobilization of skin friction within the rock-embedded zone. Instead, the passive resistance within the upper sand layer dominated the overall load capacity, which explained decreasing load capacity with increasing inclination for a rock-embedded condition.

Original languageEnglish
Article number04020147
JournalInternational Journal of Geomechanics
Issue number9
Publication statusPublished - 2020 Sept 1

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program through the Korea Institute of Energy Technology Evaluation and Planning (KETEP), the Ministry of Trade, Industry and Energy (MOTIE), the National Research Foundation of Korea (NRF), and Korea Agency for Infrastructure Technology Advancement (KAIA) with grants funded by the Government of Korea (Nos. 20194030202460, 2020R1A2C201196611, and 1615011670).

Publisher Copyright:
© 2020 American Society of Civil Engineers.

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology


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