Wave-Induced Soil Response around Submarine Pipeline

J. Ocean Eng. Technol. 2007;21(1):31-39.

Hur, Dong-Soo;Kim, Chang-Hoon;Kim, Do-Sam;

Institute of Marine Industry, Division of Civil and Environmental Engineering, Gyeongsang National University;Department of Civil and Environmental Engineering, Graduate school, Korea Maritime University;Division of Civil and Environmental Engineering, Ko

파랑작용에 의한 해저파이프라인 주변지반의 응답특성

허동수;김창훈;김도삼;

경상대학교 토목환경공학부 해양산업연구소;한국해양대학교 대학원 토목환경공학과;한국해양대학교 건설환경공학부;

Keywords: Wave.submarine pipeline.seabed, Soil response, Wave loading, $u_e-p_e$ approximation, Relative separate distance

핵심용어: 파.해저파이프라인.지반, 지반응답, 파랑하중, $u_e-p_e$ 근사, 상대이격거리

Abstract

Recently, the nonlinear dynamic responses among waves, submarine pipeline and seabed have become a target of analyses for marine geotechnical and coastal engineers. Specifically, the velocity field around the submarine pipeline and the wave-induced responses of soil, such as stress and strain inside seabed, have been recognized as dominant factors in discussing the stability of submarine pipeline. The aim of this paper is to investigate nonlinear dynamic responses of soil in seabed, around submarine pipeline, under wave loading. In order to examine wave-induced soil responses, first, the calculation is conducted in the whole domain, including wave field and the seabed, using the VOF-FDM method. Then, velocities and pressures, which are obtained on the boundary between the wave field and the seabed, are used as the boundary condition to compute the wave-induced stress and strain inside seabed, using the poro-elastic FEM model, which is based on the approximation of the Biot's equations. Based on the numerical results, the characteristics of wave-induced soil responses around submarine pipeline are investigated, in detail, inrelation to relative separate distance of the submarine pipeline from seabed. Also, the velocity field around the submarine pipeline is discussed.