岩土力学2012，Vol.33Issue(5)：1505-1512,8.
基于Cosserat理论的重力坝深层抗滑稳定分析
Deep anti-sliding stability analysis of gravity dam based on Cosserat continuum theory
摘要
Abstract
The deep slide of gravity dam is mainly reflected in the appearance of sliding channel along the slow-inclination of weak structure plane. The strain accumulates in sliding channel with very sharp discontinuous strain gradient is a typical strain localization phenomenon. The classic continuum theory suffers from the pathological mesh-dependence in strain localization problem of strain softening material in failure analysis. In this contribution, the governing field equations are regularized by adding rotational degrees-of-freedom to the conventional translational degrees-of-freedom and an elastoplastic Mohr-Coulomb model is presented based on the Cosserat continuum theory, in addition, non-associated flow rule is adopted. In the framework of classic plastic theory, the backward Euler algorithm is used to update plastic stress. A uniaxial compression is performed; the numerical results show that the load-displacement curves are uniformly converged upon different mesh sizes and mesh-independence solutions can be obtained. Finally, the overloading method is adopted in the gradually destruction process simulation analysis. The simulation results show that the classical continuum theory has salient mesh-dependence and are inclined to risk; otherwise the Cosserat theory is more reasonable.关键词
重力坝/抗滑稳定/应变局部化/Cosserat理论Key words
gravity dam/ anti-sliding stability/ strain localization/ Cosserat theory分类
建筑与水利引用本文复制引用
马刚,常晓林,周伟,周创兵..基于Cosserat理论的重力坝深层抗滑稳定分析[J].岩土力学,2012,33(5):1505-1512,8.基金项目
国家自然科学基金(No.51079113,No.51179139) （No.51079113,No.51179139）
国家自然科学杰出青年基金(No.50725931). （No.50725931）
