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Abstract Using the hollow cylinder apparatus，a gravelly soil was tested under triaxial，torsional，triaxial- torsional，and principal stress axes rotational paths. A new loading path was designed to achieve principal axes rotation under various stress levels and constant generalized shear stress during rotating. It is shown that，with the stress level increasing，the generalized shear strain due to principal axes rotation increases first，and then decreases，and increases again. The principal stress axes rotation leads to strength decline and friction angle decrease. The stress circle at failure locates in the interior part of that in triaxial-torsional test. The triaxial and torsional tests were simulated numerically by distinct element method. The results show that the horizontal slip surface is developed under torsional force. The reasons for strength decline due to principal axes rotation are also discussed.
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Received: 29 October 2012
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2013, Vol. 32 
