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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%.
2. 이론적인 지진토압
3. 동적원심모형실험
3.1 원심모형실험장비
3.2 실험모형체
3.3 계측기 배열
3.4 입력지진파 및 실험절차
4. 실험결과
4.1 배면지반 최대가속도
4.2 벽체에 작용하는 지진토압
4.3 지진토압 유발 메커니즘
4.4 지진토압 분포 및 지진력 작용점
4.5 벽체에 작용하는 지진력 비교
5. 결 론
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