Finite Element Analysis for Ultimate Bearing Capacity of Shallow FoundationMA Shao-kun1,2,YU Jing3,4,LIU Yi-lin1,5 (1.Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;2.College of Resources and Environment,Guangxi University,Nanning 530004,China;3 Beijing Institute of Residential Building Design & Research Co Ltd,Beijing 100005,China;4 College of Civil and Architectural Engineering,Beijing University of Technology, Beijing 100022,China;5.Highway Research Institute of Ministry of Communications,Beijing 100088,China)In order to analyze main bearing-capacity factors of shallow foundation,Mohr-coulomb inside-tangent circle yield criterion and associated flow rule were adopted,the overall process of foundation from elasticity to plasticity gradually was modeled by elastoplastic FEM through step increment method.Computed results of several main factors were compared and integrated with some important results of domestic and foreign model tests.It was shown that ultimate bearing capacity of weightless foundation has slight relation with the stiffness and roughness of foundation while plasticity-entrance load are obviously different due to stiffness and roughness.The destroy mechanism of foundation was influenced greatly by the main earth parameter.yield criterion;step increment method;flexible foundation;rigid foundation