Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Mechanism of Seismic Earth Pressure on Braced Excavation Wall Installed in Shallow Soil Depth by Dynamic Centrifuge Model Tests

동적원심모형실험을 이용한 얕은 지반 굴착 버팀보 지지 흙막이 벽체의 지진토압 메커니즘 분석

  • Yun, Jong Seok (Civil & Environmental Engineering, Kongju National University) ;
  • Park, Seong Jin (Civil & Environmental Engineering, Kongju National University) ;
  • Han, Jin Tae (Department of Geotechnical Engineering, Korea Institute of Civil Engineering & Building Technology) ;
  • Kim, Jong Kwan (Department of Geotechnical Engineering, Korea Institute of Civil Engineering & Building Technology) ;
  • Kim, Dong Chan (Department of Geotechnical Engineering, Korea Institute of Civil Engineering & Building Technology) ;
  • Kim, DooKie (Civil & Environmental Engineering, Crash & Quake Research Center, Kongju National University) ;
  • Choo, Yun Wook (Civil & Environmental Engineering, Crash & Quake Research Center, Kongju National University)
  • 윤종석 (공주대학교 건설환경공학과) ;
  • 박성진 (공주대학교 건설환경공학과) ;
  • 한진태 (한국건설기술연구원 지반연구본부) ;
  • 김종관 (한국건설기술연구원 지반연구본부) ;
  • 김동찬 (한국건설기술연구원 지반연구본부) ;
  • 김두기 (공주대학교 건설환경공학과 충돌진동연구센터) ;
  • 추연욱 (공주대학교 건설환경공학과 충돌진동연구센터)
  • Received : 2023.07.17
  • Accepted : 2023.07.17
  • Published : 2023.09.01
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Abstract

In this paper, a dynamic centrifuge model test was conducted on a 24.8-meter-deep excavation consisting of a 20 m sand layer and 4.8 m bedrock, classified as S3 by Korean seismic design code KDS 17 10 00. A braced excavation wall supports the hole. From the results, the mechanism of seismically induced earth pressure was investigated, and their distribution and loading points were analyzed. During earthquake loadings, active seismic earth pressure decreases from the at-rest earth pressure since the backfill laterally expands at the movement of the wall toward the active direction. Yet, the passive seismic earth pressure increases from the at-rest earth pressure since the backfill pushes to the wall and laterally compresses at it, moving toward a passive direction and returning to the initial position. The seismic earth pressure distribution shows a half-diamond distribution in the dense sand and a uniform distribution in loose sand. The loading point of dynamic thrust corresponding with seismic earth pressure is at the center of the soil backfill. The dynamic thrust increased differently depending on the backfill's relative density and input motion type. Still, in general, the dynamic thrust increased rapidly when the maximum horizontal displacement of the wall exceeded 0.05 H%.

Keywords

Acknowledgement

본 연구는 한국건설기술연구원의 주요사업인 "인공지능을 활용한 대심도 지하 대공간의 스마트 복합 솔루션개발(20230105-001)" 과제 및 정부 (과학기술정보통신부)의 재원으로 한국연구재단의 지원(2021R1A4A10 31509)으로 수행되었으며, 이에 깊은 감사를 드립니다.

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