MODELLING STRESS-STRAIN RELATIONS OF SAND

• Published in: SOILS AND FOUNDATIONS Vol. 33; no. 2; pp. 60 - 81
• Main Authors: SIDDIQUEE, MOHAMMED S.A., ABE, FUMIHIRO, PARK, CHOONSIK, TATSUOKA, FUMIO, SAKAMOTO, MAKOTO
• Format: Journal Article
• Language: English
• Published: Tokyo The Japanese Geotechnical Society 15.06.1993; Japanese Geotechnical Society
• Subjects: Earth sciences; Earth, ocean, space; Engineering and environment geology. Geothermics; Engineering geology; Exact sciences and technology; stress-strain curve(IGC : D6/E13); strain; sedimentary rocks; stress; models; shear strength; sand; anisotropy; clastic sediments
• ISSN: 0385-1621; 0038-0806
• DOI: 10.3208/sandf1972.33.2_60

A modelling method for highly nonlinear shear stress-strain relations in plane strain compression of a fine sand, Toyoura Sand, which has been used extensively in a large number of model tests by many researchers, is attempted taking into account the effects of many major factors; (1) void ratio, (2) confining pressure σ3, (3) the initial and maximum shear modulus Gmax as observed at strains less than about 0.001%, (4) anisotropic strength and deformation characteristics, (5) strain softening associated with strain localization into a shear band, and (6) the stress ratio during consolidation. The model is based on a modified hyperbolic equation. By the model proposed, a relation from very small strain (0.0001%) to the residual conditions through smooth transition from pre-peak to post-peak relations can be generated for a given condition. A generated stress-strain relation has a tangent modulus which is continuous at the peak strength state between the pre-peak and post-peak parts.