Three-Dimensional Failure in Geomaterials:Experimentation and Modeling
Experimental evidence and analyses of result of three-dimensional tests show that the shape of the failure surface for geomaterials such as soils is influenced by the intermediate principal stress,shear banding and cross anisotropy.True triaxial tests on tall specimens indicated that shear banding played an important role in the shape of the 3D failure surface,and analysis of shear banding under 3D conditions showed that the isotropic failure criterion for homogeneous deformations played an important role in the prediction of shear banding.Shear banding occurs in the hardening regime of the stress-strain behavior in the midrange of b-values from about 0.18 to approximately 0.85.Thus,the 3D failure surface is not continuous and cannot be described by a single expression,but may be obtained by combining the continuous failure surface with results of predictions of shear banding.Experiments performed in all three sectors of the octahedral plane indicate that pluviated sand exhibits cross-anisotropy with lower strength in the horizontal directions than in the vertical direction.Experiments performed in torsion shear with various inclinations of the major principal stress relative to the bedding planes showed a smooth transition in strength from vertical to horizontal,but with a trough near the orientation where shear bands are parallel to the bedding planes.
geomaterials modeling shear band shear strength
Poul V.Lade
Department of Civil Engineering The CatholicUniversity of America Washington,D.C.20064,USA
国际会议
北京
英文
47-58
2012-10-15（万方平台首次上网日期，不代表论文的发表时间）