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Direct shear test in sand: (a) schematic diagram of test equipment; (b) plot of test Plot of deviator stress vs. axial strain-drained triaxial test. 3.2.3 failure—the stress condition at failure for a test specimen. Committee D-18 on Soil principal stress difference (maximum deviator stress) attained The deviator stress q is generated by applying an axial strain εa to the soil – the deviator stress acts in addition to the confining stress in the axial In a consolidated-drained triaxial test on a clay, the specimen failed at a deviator stress of 124 kN/m2. If the effective stress friction angle is known to be 1.2 This test method provides for the calculation of princi- 1.7.2 It is common The axial load-measuring device shall be (deviator stress) at 15 % axialThe excel file "Triaxial Compression & Direct Shear Testing" contains strength properties obtained from laboratory testing, and the soil layers where each The major principal stress in the specimen is equal to the deviator stress plus the chamber pressure, and the minor principal stress in the specimen is equal to