Abstract
Caisson foundation is a cost-effective alternative to conventional foundation for offshore structures. The bearing behavior of caisson foundation under combined loading is important for design. This paper aims at predicting the mechanical characteristics of caisson foundation by using discrete element method and analyzing the micro particle behaviors to understand the failure mechanism of the foundation in soil. Since the foundation soil is sand, discrete element method is adopted to model the loading tests with combined vertical loading, horizontal loading and moment. The numerical simulations are compared with experiments in terms of the trend of load-displacement curves and volume deformation curves. Then a series of micro analysis (including particle rotation field, particle displacement field, average particle rotation field, stress field and force chain distribution) are performed to investigate the failure mechanism of foundation with the insight of microstructure. Meanwhile, the influence of loading combination on failure is studied.
Published Version
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