Hollow cylinder torsional shear tests to evaluate the role of principal stress directions on cyclic resistance

S. Sivathayalan, V. Manmatharajan, P. Logeswaran

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Laboratory Testing

ABSTRACT: A new hollow cylinder torsional shear device commissioned at Carleton University was used to study the effects of principal stress rotation on cyclic resistance. Specimens at identical initial states were subject to a given cyclic stress ratio, but along stress paths that impose different levels of stress rotation. The paths explored included smooth, continuous rotation of principal stress directions, and sudden jump rotation. These results suggest that the general notion that the weakest response is expected when the major principal stress is aligned with the bedding planes may not be valid under cyclic loading, and cyclic simple shear tests provide a convenient means of determining the cyclic resistance.

RESUMEN: Un nuevo dispositivo tubular para medir esfuerzos de cortante bajo cargas de torsión se ha fabricado en la Universidad de Carleton y ha sido utilizado para estudiar los efectos de la rotación del esfuerzo principal en la resistencia bajo cargas cíclicas. Muestras con condiciones iniciales idénticas fueron sometidas a un esfuerzo cíclico determinado pero siguiendo una trayectoria con niveles diferentes de rotación de esfuerzos. Las trayectorias de carga exploradas incluyen una rotación continua y suave, sin cambios drásticos, y otra con cambios bruscos. Los resultados parecen indicar que, bajo cargas cíclicas, la sigue la dirección de los estratos de depósito en la muestra como se creía. También se demuestra que una prueba cíclica simple de cortante es un ensaye adecuado para determinar la resistencia a cargas cíclicas.

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