岩土力学2018，Vol.39Issue(4)：1168-1175,8.DOI:10.16285/j.rsm.2016.0833
单轴压缩黏性土剪切带相互作用及损伤试验研究
Experimental studies of damages and shear band interactions for clay specimens in uniaxial compression
摘要
Abstract
Studies of damages in shear bands are important for obtaining a full understanding of failure mechanisms of materials,and for accurate modeling of deformations in shear bands.To study the distribution and evolution of damages in shear bands in clay specimens in uniaxial compression,monitored lines are arranged according to positions of clear shear bands along their tangential directions at higher longitudinal strains.Smooth strain fields at these lines are obtained using a bicubic spline interpolation function from results based on a digital image correlation method.The damage variable-longitudinal strain curves for entire specimens and shear bands are compared.It is found that in total the damage variable-longitudinal strain curves for entire specimens are linear,while those for shear bands are convex upward,suggesting that damage developments in shear bands become faster and faster as longitudinal strains increase.The envelop of the damage variable-longitudinal strain curves for shear bands is like a horse-tail,revealing that interactions among shear bands become intensive as deformation proceeds.For specimens with low moisture contents,changes in damage variables for shear bands are generally synchronic for parallel or co-linear shear bands,especially for well-developed shear bands,however,the shear band spacing cannot be large enough.The damages in one shear band between two conjugate or intersecting shear bands are dominant at a certain stage due to competition between them.However,if the two shear bands have developed fully,changes in damage variables can be synchronic.For specimens with high moisture contents,changes in damage variables for shear bands are generally synchronic for parallel or conjugate shear bands,reflecting weak interactions among shear bands.关键词
黏性土样/剪切带/相互作用/损伤变量/同步Key words
clay specimen/shear band/interaction/damage variable/synchronization分类
建筑与水利引用本文复制引用
王学滨,张楠,潘一山,张博闻,杜亚志..单轴压缩黏性土剪切带相互作用及损伤试验研究[J].岩土力学,2018,39(4):1168-1175,8.基金项目
国家自然科学基金项目(No.51574144) （No.51574144）
辽宁省高等学校优秀人才支持计划(No.LR2015029).This work was supported by the National Natural Science Foundation of China (NSFC) (51574144) and the Program for Liaoning Excellent Talents in University (LNET) (LR2015029). （No.LR2015029）
