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论文类型：期刊论文

发表时间：2022-06-29

发表刊物：水利学报

所属单位：建设工程学部

卷号：41

期号：12

页面范围：1407-1415

ISSN号：0559-9350

摘要：Using the geotechnical static and dynamic universal triaxial and
   torsional shear apparatus, the undisturbed silty soft clay in the
   Yangtze estuary is tested under unconsolidated-undrained conditions,
   with the dynamic triaxial, 45° line coupling/circle coupling complex
   cyclic shear tests and the static triaxial tests after cyclic loadings.
   It is found that the differences of the strains and the pore water
   pressure increments caused by three different modes of cyclic loadings
   become more pronounced with an increase of the number of cycles as well
   as the degradation degrees of static shear strength after cyclic
   loadings. After the same number of cyclic shear, the strain and pore
   water pressure increment caused by bidirectional coupling cyclic shear
   are larger than those caused by mono-directional cyclic shear and the
   degradation degree of static shear strength after bidirectional coupling
   cyclic shear become more evident. As for bidirectional coupling cyclic
   shear, the strain and pore water pressure increment caused by circle
   coupling cyclic shear are larger than those caused by 45° line coupling
   cyclic shear and the degradation degree of static shear strength after
   circle coupling cyclic shear is more significant. This indicates that
   continuous rotation of principal stress direction makes larger strain
   and pore water pressure increment and reduces the static shear strength
   remarkably. The generalized synthetic shear strain and the synthetic
   pore water pressure incremental ratio are defined respectively and the
   relationships between static shear strength and generalized synthetic
   shear strain, shear strength and synthetic pore water pressure
   incremental ratio are proposed

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