Applicability of Pseudostatic Analysis for the Seismic Design of Temporary Retaining Structures in a Deep Excavation

Sang-Hwa Yu; Dong-Chan Kim; Jongkwan Kim; Jin-Tae Han

doi:10.7843/kgs.2023.39.9.35

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2023 Vol.39, Issue 9 Preview Page Next Page

Applicability of Pseudostatic Analysis for the Seismic Design of Temporary Retaining Structures in a Deep Excavation 흙막이 가시설 내진설계를 위한 등가정적해석의 유효성 분석

30 September 2023. pp. 35-50

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Abstract

A preliminary study is conducted to develop seismic design guidelines for temporary retaining structures in a deep excavation. The study involved a comprehensive literature review of the seismic design standards applied domestically and internationally, as well as various methods to calculate seismic earth pressure for pseudostatic analysis. The FLAC 2D, a two-dimensional finite difference analysis program, was utilized to perform pseudostatic analysis using the Semirigid pressure method, Wood method, and Mononobe-Okabe method. The resulting analysis data for the wall moment and axial force of the strut were compared with the dynamic analysis outcomes to evaluate the applicability of pseudostatic analysis. The Semirigid pressure method predicted the most reasonable moment for Stiff walls experiencing horizontal displacements up to 0.4%H. Predicting the axial force of the strut exactly was challenging because the pseudostatic analysis cannot consider dynamic soil-structure interaction; however, it is deemed available for conservative preliminary review to ensure safety.

Keywords

Axial force

Bending moment

Deep excavation

FLAC 2D

Pseudo static analysis

Semirigid pressure method

Stiff wall

Temporary retaining structure

본 논문은 흙막이 가시설의 내진설계 가이드라인을 작성하기 위한 기초 연구로서, 국내외에서 적용되고 있는 내진설계 기준과 등가정적해석을 위한 동적토압 산정 방법에 대해 문헌연구를 수행하였다. 그리고 2차원 유한차분해석 프로그램인 FLAC 2D를 이용하여 Semirigid pressure 방법, Wood 방법, Mononobe-Okabe 방법에 따라 등가정적해석을 수행하고, 벽체의 모멘트와 지보재 축력에 대한 해석 결과를 동해석 결과와 비교하여 등가정적해석의 적용성을 평가하였다. Semirigid 방법은 0.4%H 이하의 수평 변위가 발생하는 Stiff wall의 모멘트를 가장 합리적으로 예측하였다. 지보재의 축력은 구조물과 흙 사이의 동적인 상호작용을 고려할 수 없어 정확하게 예측하는 것이 어려웠으나, 안전측으로 보수적인 설계를 위한 예비검토에 활용할 수 있을 것으로 판단된다.

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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 :9
Pages :35-50
Received Date : 2023-08-11
Revised Date : 2023-09-15
Accepted Date : 2023-09-15
DOI :https://doi.org/10.7843/kgs.2023.39.9.35

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

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