Cyclic Simple Shear, Torsional Shear and Triaxial—A Comparative Study

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by Shobha Bhatia,
Joseph Schwab,
Isao Ishibashi,

Document Type: Proceeding Paper

Part of: Advances in the Art of Testing Soils Under Cyclic Conditions

Abstract: Many different testing apparatus are used to duplicate in laboratory soil samples the stress state generated in situ by earthquakes. A wide diversity of data has been generated and this paper compares the cyclic behavior of soil predicted by cyclic triaxial, simple shear and torsional shear test apparatus. Comparisons are made for drained and undrained samples with and without initial static shear stresses and for both stress and strain controlled tests. Results show that similar volume change, pore pressure build up and stress ratios to cause liquefaction are measured by the different apparatus. In general, triaxial tests predict the largest liquefaction resistance, simple shear the lowest, and torsional shear somewhere in between.

Subject Headings: Shear tests | Shear stress | Triaxial tests | Soil liquefaction | Shear resistance | Soil tests | Soil analysis | Soil stress |

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