Numerical Modeling of the Seismic Influence on an Underwater Composite Oil Pipeline

Abstract

The problem of numerical modeling of the process of initiating seismic activity on the shelf and its destructive effect on composite oil pipelines laid along the seabed is considered. To describe the dynamic behavior of the medium, the determining systems of equations of the theory of elasticity and acoustics with explicit distinguishing all layers are used. The polymeric composite material of the pipeline is described in a visco-elastic orthotropic model. An algorithm that allows estimating the volume of oil pipeline destroyed at the specified level of seismic activity and strength characteristics of the composite is proposed. A distinctive feature of the developed approach involves splitting the problem into two stages: the full wave calculation of the propagation of seismic waves from the earthquake source to the day surface and the calculation of a composite pipeline element as a complexly shaped object of anisotropic material. For the numerical calculation, the grid-characteristic method is used for hexahedral and tetrahedral computational grids.