Dynamic Behavior of Triaxial Micropile Under Varying Installation Angle: A Numerical Analysis

Jun-Seo Jeon; Mekonnen Meron Alebachew; Yoon-Ah Kim; Jong-Kwan Kim; Byeong-Soo Yoo; Tae-Hyuk Kwon; Sung-Yul An; Jin-Tae Han

doi:10.7843/kgs.2023.39.11.41

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2023 Vol.39, Issue 11 Preview Page Next Page

Dynamic Behavior of Triaxial Micropile Under Varying Installation Angle: A Numerical Analysis 수치해석을 통한 설치 경사각도에 따른 삼축내진말뚝의 동적 거동특성

30 November 2023. pp. 41-51

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Abstract

This study employs three-dimensional simulation through FLAC3D to investigate the impact of installation angles on the dynamic characteristics of Triaxial Micropiles. The numerical model is validated against centrifuge test results to ensure accuracy. The findings reveal significant influences of the installation angle on the dynamic behavior of Triaxial Micropiles. Specifically, under seismic conditions such as the Capetown and San Fernando earthquakes, the lowest recorded values for peak bending moment and settlement occurred at an installation angle of 15 degrees. In contrast, when subjected to an artificial earthquake with a frequency of 2 Hz (Sine 2 Hz), Micropiles installed at 0 degrees exhibited the lowest peak bending moment, maximum axial load, and settlement values.

Keywords

Centrifuge test

Dynamic behavior

Installation angle

Numerical analysis

Triaxial micropile

설치 경사각도에 따른 삼축내진말뚝의 동적 거동 특성을 파악하기 위해 3차원 수치해석을 수행하였다. FLAC3D를 통해 3차원 수치모델을 구축하였으며, 동적 원심모형실험과의 비교를 통해 검증하였다. 수치해석 결과, 경사각도에 따라 말뚝의 동적 거동이 확연히 달라짐을 확인하였다. 실지진파 조건(Capetown EQ, San Fernando EQ)에서는 경사각도가 15도 일 때, 다른 경사각도(0도, 30도)에 비해 말뚝의 휨모멘트 및 침하량이 적음을 알 수 있었다. 반면 인공지진파 조건(Sine 2Hz EQ)에 대해서는 경사각도가 0도 일 때 가장 적은 부재력(휨모멘트, 축력) 및 침하량을 보여 지진파의 특성에 따라 동적 거동이 달라짐을 확인하였다.

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Information

Publisher :The Korean Geotechnical Society
Publisher(Ko) :한국지반공학회
Journal Title :Journal of the Korean Geotechnical Society
Journal Title(Ko) :한국지반공학회 논문집
Volume : 39
No :11
Pages :41-51
Received Date : 2023-10-05
Revised Date : 2023-10-16
Accepted Date : 2023-10-16
DOI :https://doi.org/10.7843/kgs.2023.39.11.41

Journal of the Korean Geotechnical Society ISSN:1229-2427(Print) 2288-646X(Online) 한국지반공학회 논문집

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