Abstract
Pipeline load-displacement response to monotonic and cyclic loading is an important issue in offshore pipeline engineering, especially as such response governs the on-bottom stability of unburied pipelines. The drained response is a fundamental consideration in developing a plasticity model for pipeline-soil interaction. Centrifuge model tests were conducted to investigate the drained monotonic and cyclic behaviour of offshore pipelines shallowly embedded in calcareous sand. Typical results from the tests are presented. The test data reveal a linear load-displacement response during monotonic penetration, a parabolic yield surface under combined vertical and horizontal loading, and a significant increase in stiffness and capacity after cyclic loading.
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