摘要
采用修正剑桥模型,研究在平面应变条件下正常固结土剪切带的产生机理和剪切带形状的多样性。研究结果表明,剪切带是由材料的不均匀变形引起,并由试样局部应变能释放的冲击作用形成的;试样端部摩擦约束与试样内部初始缺陷都能够引起试样的不均匀变形进而诱发剪切带。分析了不同边界约束条件、初始缺陷设置方式及二者共同作用对剪切带形式的影响,平面应变条件下土体的剪切带有单一型、交叉型和多段型等3种形式,多段剪切带的发展具有先后顺序。
Shape multiformity and formation mechanism of shear band in normal consolidated soil under plane strain condition was analyzed based on Modified Cam-Clay Model.The results show that shear band is formed because of impact action caused by strain energy release.End friction restraint and initial defect in the sample can form inhomogeneous deformation,then induce shear band.The impact of different boundary restraint,initial defect set and their interactions on shear band were analyzed.The shape of shear band under plane strain was divided into single,cross and multisegment types,and the evolution of multisegment type shear band is observed to have time sequence.
出处
《防灾减灾工程学报》
CSCD
2010年第5期544-549,共6页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(50809001)
北京市属高等学校人才强教深化计划中青年骨干人才项目(PHR201008009)
北京工业大学第一届博士创新计划项目资助
关键词
剪切带
端部约束
初始缺陷
应变能
Shear band
end restraint
initial defect
strain energy
作者简介
侯世伟（1982-），女，博士研究生。主要从事岩土工程数值模拟研究。Email：houshiwei@emails．bjut．edu．cn
