On the influence of the polarization and the shape of the strain loop on strain accumulation in sand under high-cyclic loading

Abstract This paper presents results of cyclic triaxial (CT) tests on sand with a simultaneous variation of the axial and the lateral stresses. Furthermore, a cyclic multidimensional simple shear (CMDSS) device and corresponding test results are discussed. For in-phase cycles with a constant strain amplitude it is demonstrated that the accumulation rate is independent of the polarization of the cycles in the strain space. Polarization changes lead to a temporary increase of the accumulation rate: they increase the effectiveness of compaction. For out-of-phase (e.g. elliptical) cycles the shape of the strain loop significantly influences the residual strain. A circular strain loop generates twice larger accumulation rates than a one-dimensional strain loop with identical span. The accumulation rate is not influenced by the circulation of the strain loop. It is shown that the direction of accumulation (so-called “cyclic flow rule”) is only moderately affected by the polarization and the shape of the cycles.

[1]  W. Kjellman,et al.  Testing The Shear Strength of Clay in Sweden , 1951 .

[2]  Muniram Budhu,et al.  NUMERICAL ANALYSIS OF SOILS IN SIMPLE SHEAR DEVICES , 1987 .

[3]  Kenji Ishihara,et al.  YIELDING OF LOOSE SAND IN THREE-DIMENSIONAL STRESS CONDITIONS , 1982 .

[4]  T. Wichtmann,et al.  Experimental evidence of a unique flow rule of non-cohesive soils under high-cyclic loading , 2006 .

[5]  H. Bolton Seed,et al.  SETTLEMENT OF SANDS UNDER MULTIDIRECTIONAL SHAKING , 1975 .

[6]  吉見 吉昭.  CYCLIC SIMPLE SHEAR TESTS ON SATURATED SAND IN MULTI-DIRECTIONAL LOADING , 1981 .

[7]  Andrzej Niemunis,et al.  On the estimation of the amplitude of shear strain from measurements in situ , 1995 .

[8]  L. Bjerrum,et al.  Direct Simple-Shear Tests on a Norwegian Quick Clay , 1966 .

[9]  Torsten Wichtmann,et al.  Explicit accumulation model for cyclic loading , 2003 .

[10]  Torsten Wichtmann,et al.  Strain accumulation in sand due to cyclic loading: drained triaxial tests , 2005 .

[11]  Torsten Wichtmann,et al.  Strain accumulation in sand due to cyclic loading: drained cyclic tests with triaxial extension , 2007 .

[12]  Muniram Budhu,et al.  Nonuniformities imposed by simple shear apparatus , 1984 .

[13]  Ronald F. Scott,et al.  Deformation of Sand in Hydrostatic Compression , 1967 .

[14]  Torsten Wichtmann,et al.  A high-cycle accumulation model for sand , 2005 .

[15]  Raymond B. Seed,et al.  Elimination of membrane compliance in undrained triaxial testing. I. Measurement and evaluation , 1993 .