基于能量耗散修正的Boom clay上下加载面模型及其数值实施

doi:10.13722/j.cnki.jrme.2014.1202

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Abstract Due to the limitation of Modified Cam-clay model，which can?t depict overconsolidated or structured clay，the concept of super-subloading surface was introduced to describe the destruction of Boom clay. According to the characterization of yield surface of Boom clay，the super-subloading surface model was modified based on energe dissipation. Adopting the closest point projection method(CPPM)，the UMAT subroutine of the developed model is implemented in FEM code ABAQUS. With the developed model and Modified Cam-clay model，numerical simulations of undrained triaxial compression tests on Boom clay under different confining pressure was performed. The simulated results with two different models were compared with the test results. It was shown that the developed model can depict the destruction process of Boom clay during shearing and the peak strength of overconsolidated clay was decreased compared with conventional super-sub loading surface model.

Key words： super-subloading surface energy dissipation overconsolidation stress iteration algorithm structure characteristic UMAT

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1202 OR http://www.rockmech.org/EN/Y2015/V34/I06/16

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