The three main points considered here are: 1) the choice of failure criterion for anisotropic soils; 2) the distinction between inherent or intrinsic anisotropy caused by a difference in initial effective stresses; and 3) the interpretation of in situ vane test in anisotropic soils in relation to the importance of the direction of shear stresses. Lumb applied the theory of perfectly plastic materials to the analysis of test data, using Hill's yield criterion for cohesive anisotropic soils. The writer distinguished between two types of anisotrophy which caused the directional dependence of strength. The directional variation of undrained strength caused by stress anisotrophy has been examined by Hausen and Gibson. Samples are subjected to a negative pore pressure and therefore the initial effective stress in the sample is isotropic. Results are given of a series of isotropically consolidated, undrained tests with pore pressure measurements. The increase in the ratio of F sub c/F sub V with slope angle is explained, as are the vane test results. The writer agrees with Meyerhof that as the degree of anisotropy increases, the potential failure surface will depart from the cylindrical form.

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  • Accession Number: 00095886
  • Record Type: Publication
  • Report/Paper Numbers: Closure
  • Files: TRIS
  • Created Date: Jun 10 1975 12:00AM