摘要
颗粒破碎对颗粒材料宏观力学行为有重要影响。结合Hardin的破碎经验公式,将表征破碎程度的破碎参量与Cosserat连续体的内部长度参数相关联,形成一个基于Cosserat连续体且能考虑颗粒破碎的弹塑性模型。数值算例主要考察了颗粒破碎对颗粒材料承载能力、塑性应变及局部化行为的影响,数值结果表明,颗粒破碎主要发生在剪切带内,颗粒破碎使得剪切带明显变窄且剪切带内外等效塑性应变梯度明显增大。
Particles' breakage has an important effect on the macromechanical behavior of granular materials.An elastoplastic model combined with an experiential crushing equation is suggested for crushable granular materials based on Cosserat continuum,Hardin's definition of relative breakage r B,which is used to quantify the extent of crushing,can be obtained from the crushing equation according to normal crushing stress.The internal length scale of Cosserat continuum theory is related to the average particle size of granular materials;and the evolution of which is computed by the relative breakage r B.Numerical examples focus mainly on the effect of particle crushing on the bearing capacity and localization of plastic strain.Numerical results illustrate that particles crush mainly in shear band,and shear band obviously becomes narrow and the equivalent plastic strain gradient increases when considering crushing.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2013年第S1期67-72,79,共7页
Rock and Soil Mechanics
基金
国家自然科学基金资助(No.10802060
No.11172216)
国家重点基础研究发展计划项目资助(No.2010CB732005
No.2010CB731502)
