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Seismic Performance of Buried Pipelines Against Large Ground Deformation of Strike-Slip Faults

The response of a pipeline buried in soft soil and hard soil subjected to movement of strike-slip fault at a 90° crossing with and without axial soil–pipe interaction was evaluated. The results of a FEM-based model were compared with those of an existing analytical solution based on the “beam on elastic foundation” theory. The results show that the effect of axial soil–pipe interaction was negligible in soft soil but had a slight effect in hard soil. When the axial soil–pipe interaction is taken into account for the hard soil cases, the bending moment, shear forces and compression stresses of the buried pipeline decrease, and the axial force response of the pipeline increases. For a buried pipeline subjected to movement of a 90° strike-slip fault, the bending moment response was predominantly in the stress field, which indicates that if the 90° strike-slip fault moves, the pipeline is most susceptible to buckling damage.

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