Numerical modelling of the capacity envelopes under combined loadings of pipe-soil interaction within total and effective stress frameworks

Offshore pipelines are generally laid directly on the seabed and operated in high temperature and high pressure conditions. Accurate assessment of the pipe-soil interaction response is essential to understand the geotechnical behaviour of offshore pipeline. In order to describe the pipe-soil interaction, this thesis presents capacity envelopes of offshore pipelines subjected to combined loadings within total and effective stress frameworks. The tension between pipe and soil is accounted for and its influence on the capacity envelopes are systematically explored. This thesis aims to develop reliable capacity envelopes under combined loadings in order to enable realistic prediction offshore pipeline response.