파압에 의한 해안구조물-해저지반의 침하거동에 대한 수치해석
Numerical Analysis on Settlement Behavior of Seabed Sand-Coastal Structure Subjected to Wave Loads
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초록
태풍에 의해 발생된 파랑하중에 의해 방파제, 안벽 등과 같은 해안구조물 하부의 해저지반 침하가 발생될 수 있다. 만약 해저지반이 모래인 경우, 잔류과잉간극수압발생과 반복적인 파랑하중에 의해 해저지반의 침하현 상이 더 발생될 확률이 높아질 것이다. 그러나 대부분의 해안구조물은 설계에서 파랑하중을 정적상태의 등분포하중 으로 구조물에만 작용하는 것으로 가정하고 있지만 실제로는 동적인 파랑하중이 구조물과 해저지반에 동시에 작용 한다. 따라서 본 연구에서는 시간에 따른 실제파압을 고려하고, 구조물뿐만 아니라 해저지반에도 작용하는 것으로 고려하였다. 수치해석 결과 파랑하중이 구조물과 해저지반에 큰 영향을 미친 것으로 나타났다. 시간에 따른 해저지 반의 변형거동이 해석되었으며 해저지반에서 유효응력의 변화와 유효응력경로의 변화를 분명하게 확인할 수 있었다.
Abstract
Seabed settlement underneath a coastal structure may occur due to wave loading generated by storm surge. If the foundation seabed consists of sandy soil, the possibility of the seabed settlement may be more susceptible because of generation of residual excess pore-water pressure and cyclic mobility. However, most coastal structures, such as breakwater, quay wall, etc., are designed by considering wave load assumed to be static condition as an uniform load and the wave load only acts on the structure. In real conditions, however, the wave load is dynamically applied to seabed as well as the coastal structure. In this study, therefore, a real-time wave load is considered and which is assumed acting on both the structure and seabed. Based on a numerical analysis, it was found that there exists a significant effect of wave load on the structure and seabed. The deformation behavior of the seabed according to time was simulated, and other related factors such as the variation of effective stress and the change of effective stress path in the seabed were clearly observed.
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