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论文类型：期刊论文

发表时间：2018-09-10

发表刊物：INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWORKS

收录刊物：SCIE

卷号：14

期号：9

ISSN号：1550-1477

关键字：Flexible loading; noncontact measurement; local deformation measurement; strain localization; shear band; stress-strain relationship; plane strain test

摘要：A new type of plane strain apparatus is developed to study the mechanical properties and shear band failure of soil, which possesses the advantages of flexible loading for lateral confining pressure and noncontact measurement and high measurement accuracy for surface deformation. In addition, the whole deformation procedure of the specimen can be recorded with images, which can be used to describe the development of strain localization and the shear band. It can be seen that the deformation process has three obvious stages, that is, the hardening stage, the softening stage, and the residual stage. The measured inclination angles of shear bands decrease as confining pressure or the mean size increases. In addition, it can be observed that the sand presents continuing growth of the unrecoverable plastic deformation inside the shear band and exhibits almost elastic deformation outside. From the detection results for local points in the specimen, the stress-strain relationships are different for different parts, and the sand sample behaves like an uneven structure instead of an even element, which means that the usual method of measuring the stress-strain relationship of the soil sample is only a macroscopic approximation.