Transcription of UU Triaxial Test - Fullerton
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UU Triaxial Test - Fullerton
Civil & Environmental Engineering Department EGCE 324L ( soil mechanics Laboratory) Spring 2008 Instructor: Binod Tiwari, PhD Date: 4/28/2008 1UU Triaxial Test Concept of Shear Strength Please refer the same materials you got in Unconfined Compression test. a. Triaxial Shear Test Figure 1 Triaxial compression testing device Civil & Environmental Engineering Department EGCE 324L ( soil mechanics Laboratory) Spring 2008 Instructor: Binod Tiwari, PhD Date: 4/28/2008 2 Triaxial test is more reliable because we can measure both drained and undrained shear strength. Generally diameter (3 tall) or diameter (6 tall) specimen is used. Specimen is encased by a thin rubber membrane and set into a plastic cylindrical chamber. Cell pressure is applied in the chamber (which represents 3 ) by pressurizing the cell fluid (generally water). Vertical stress is increased by loading the specimen (by raising the platen in strain controlled test and by adding loads directly in stress controlled test, but strain controlled test is more common) until shear failure occurs.
EGCE 324L (Soil Mechanics Laboratory) Spring 2008 Instructor: Binod Tiwari, PhD Date: 4/28/2008 2 Triaxial test is more reliable because we can measure both drained and undrained shear strength. Generally 1.4” diameter (3” tall) or 2.8” diameter (6” tall) specimen is used.
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