基于Cosserat连续体理论的重力坝深层抗滑稳定分析

Analysis of Deep Anti-sliding Stability of Gravity Dam Based on Cosserat Continuum Theory

完成基于Cosserat理论Drucker-Prager弹塑性模型在ABAQUS中的二次开发,并进行平面应变条件下单轴压缩的验证,结果表明本模型能保证应变局部化问题的正定性。采用强度储备系数法,模拟重力坝坝基应变局部化渐进破坏过程,对比Cosserat连续体理论与经典连续体理论的计算结果,表明采用Cosserat连续体理论的结果对网格密度不敏感,有限元迭代不收敛对应的强度储备系数有较大幅度的提高。

User subroutine UEL of ABAQUS was used in secondary developments for an elastoplastic Drucker-Prager model based on the Cosserat continuum theory.A uniaxial compression was performed,and the result showed that this model can ensure well-posedness in strain localization.Strength reserve coefficient method was adopted to simulate the strain localization for the foundation of gravity dam.Comparison between the result of the cosserat continuum theory and classical continuum theory showed that the cosserat continuum theory is not sensitive to the mesh intensity,and strength reserve coefficient to FEM iteration unconverged has a substantial increase.