지진시 동토압을 받는 역 T형 옹벽의 접지압 산정에 관한 연구
Dynamic Bearing Pressure of Inverted T-type Retaining Walls Subjected to Seismic Motion
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초록
본 논문에서는 지진시 역 T형 옹벽에 작용하는 기초 접지압의 변화를 Mononobe-Okabe공식을 이용하는 기존의 유사정적 설계기법과, 지반의 비선형 부지증폭현상 고려한 유한차분해석을 이용하여 살펴 보았다. 옹벽 설계에 있어서 높이 10m를 초과하는역 T형 옹벽의 경우 상시 안정조건을 만족함에도 불구하고 지진시 지지력 안정조건을 만족하지 못하는 경우가 발생한다. 안정조건을 만족시키지 못하는 주요 원인은 동토압으로 야기되는 편심하중 증가로 인한 기초 유효저면적의 감소이다. 본 논문에서는 역 T형 옹벽의 지진시 유효저면적의 변화를 유한차분해석프로그램(FLAC)을 이용하여 살펴보았으며, 그 결과로부터 동적지지력 계수의 설계 적용성을 검토하였다
Abstract
Pseudo static analysis using the Mononobe-Okabe method and numerical analysis considering a small strain nonlinearity from the soil were performed to determine the bearing pressure changes of the inverted T-type retaining wall subjected to earthquake motions. In many cases, an inverted ‘T’ type retaining wall of more than 10 m shows bearing capacity failure under earthquake conditions, despite showing sufficient bearing capacity during normal conditions. The most important reason for this is the change of the effective base area during an earthquake. In this paper, the change of the effective base area of an inverted ‘T’ type wall is analyzed by using finite difference element code (FLAC). In addition, the effect of dynamic bearing capacity coefficients (which has been suggested by several researchers but not adopted in current design codes and procedures) was verified.
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