Abstract
Dynamic response of pipelines lying in a back-filled trench in a semi-infinite medium is investigated. The pipelines are modelled as circular cylindrical shells of small thickness. The problems associated are the ones of plane strain, in which it is assumed that the waves are propagating perpendicular to the pipe-axes. Since no exact solution is obtainable for the problems considered here, a numerical technique that combines the finite element method with multipolar representation of the scattered field is used. Numerical results are presented for the normal displacements, as well as the hoop stress in the pipewall either in the presence or absence of another pipe lying nearby.
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