On the Estimation of Seismic Resistance of Modern Composite Oil Pipeline Elements

The initiation of seismic activity on the continental shelf and its destructive effect on composite oil pipelines laid on the seabed is modeled numerically. The dynamic behavior of the medium is described by determining systems of elasticity and acoustic equations with an explicit separation of all layers. The composite is described as an orthotropic material. An algorithm is proposed that estimates the amount and type of oil pipeline destruction at a given level of seismic activity and given strength characteristics of the composite. A distinctive feature of the developed approach is that the problem is split into two stages calculated on different scales: the full-wave computation of seismic wave propagation from the earthquake source to the day surface and the computation of a composite pipeline element as an anisotropic object of complex shape. A grid-characteristic method on hexahedral and tetrahedral grids is used for the numerical computation.