Sand Liquefaction In Hollow Cylinder Torsion Under Irregular Excitation

ABSTRACT Dynamic torsion shear tests on hollow cylindrical samples of saturated sand were conducted by incorporating the test apparatus into an electrohydraulic type loading system in which any desired form of load time history can be applied to the specimen. The acceleration records taken during the recent major earthquakes were used as representative time histories in the test programs. For the several wave forms used relationships were established between the amplitude of shear stress and the residual pore pressures, which may be used to assess the dynamic pore pressures under irregular loading conditions. Finally, the results of dynamic torsion shear tests were compared with the corresponding behavior in dynamic triaxial tests and the correlation between them are discussed.