Dynamic response of a partially debonded pipeline embedded in a saturated poroelastic medium to harmonic plane waves: Fid-Bau Portal

Dynamic response of a partially debonded pipeline embedded in a saturated poroelastic medium to harmonic plane waves

Fang, Xue-Qian / Liu, Jin-Xi / Wang, Yang

Abstract A practical model of partially debonded pipeline embedded in a saturated poroelastic medium is proposed, and the dynamic response of this model to harmonic plane waves is theoretical investigated. Biot׳s poroelastic theory is introduced to describe the dynamic equations of the saturated poroelastic medium, and the potentials obtained from Helmholtz decomposition theorem are expressed by wave function expansion method. The debonding areas around the pipeline are assumed to be filled with water. The disturbed solutions of basic field equations in these areas are expressed in terms of a scalar velocity potential. Different boundary conditions of bonded and debonded areas are adopted, and the expanded coefficients are obtained. An example of one partially debonded area is presented and analyzed. It is found that the stresses in the perfectly bonded and debonded areas show great difference, and the jump of dynamic stress at the connection points between these two areas is great in the case of low frequency. The effect of debonded areas on the dynamic stress under different thicknesses of lining is also examined.

Highlights • A practical model of partially debonded pipeline in saturated poroelastic medium is proposed. • The analytical solutions of dynamic response in perfectly bonded and debonded areas are given. • The effect of the debonding area on the dynamic stress under different thicknesses of lining is analyzed and discussed. • The methods for increasing the reliability of partially debonded pipelines in different load frequencies are presented.