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http://dx.doi.org/10.7843/kgs.2022.38.12.45

Parametric Study for Seismic Design of Temporary Retaining Structure in a Deep Excavation by Dynamic Numerical Analysis  

Yang, Eui-Kyu (Infra Engineering Team, GS E&C)
Yu, Sang-Hwa ( CEO, SALT Eng)
Kim, Dongchan (Dept. of Geotechnical Eng. Research, Korea Inst. of Civil Eng. and Building Tech.)
Kim, Jongkwan (Dept. of Geotechnical Eng. Research, Korea Inst. of Civil Eng. and Building Tech.)
Ha, Ik-Soo (Dept. of Civil Engrg., Kyungnam Univ.)
Han, Jin-Tae (Dept. of Geotechnical Eng. Research, Korea Inst. of Civil Eng. and Building Tech.)
Publication Information
Journal of the Korean Geotechnical Society / v.38, no.12, 2022 , pp. 45-65 More about this Journal
Abstract
In this paper, a diaphragm wall that supports soils and rock was modeled using FLAC, a finite difference analysis program, to evaluate the seismic behavior of temporary retaining structures in a deep excavation. The appropriateness of the numerical model was verified by comparing its results with those of the centrifuge test performed in a similar condition. The bending moment distribution along the diaphragm wall shows a very similar tendency, and the maximum acceleration obtained at the backfill and top of the wall shows a difference within 5%. Based on the developed model, a parametric study was conducted in various input earthquake, ground, and excavation conditions. The maximum structural forces and bending moment under earthquake loading were compared with the maximum values during excavation, from which the critical condition that requires a seismic design was roughly sorted out. The maximum bending moment of a wall that retains soil layers increased 17%. Particularly, the axial force of struts located in loose soils increased 32% under 100 years return period of an earthquake event, which strongly is estimated to require seismic design for structural safety.
Keywords
Bending moment; Deep excavation; Diaphragm wall; FLAC; Parametric study; Seismic design; Temporary retaining structures;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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