考虑黏聚特性和拉压不等效应的修正剑桥模型及数值实现

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Abstract Due to the conventional modified Cam-clay model can not describe the cohesion properties and different yield strengths in tension and compression performance (S-D effect for short) for geotechnical materials，a modified Cam-clay model with non-associated flow rule is established considering S-D effect on deviatoric plane and cohesion on meridian plane. The main contents of implicit constitutive integration algorithm for the improved model and its implementation procedure are discussed systematically. Based on the platform of software ABAQUS，the user-defined material subroutine UMAT interface is developed to generate corresponding constitutive subroutine of the modified Cam-clay model. Meanwhile，the numerical simulation of triaxial compression test on Belgium Boom clay is implemented. The study result shows that the improved constitutive model and the UMAT subroutine have higher calculation accuracy and good stability，which could effectively depict the nonlinear and plastic flow characteristics of Belgium Boom clay.

Key words： rock mechanics S-D effect modified Cam-clay model constitutive integration algorithm user-defined subroutine UMAT

Received: 16 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I8/1574

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