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Undisturbed samples of soft saturated mud were subjected to oscillating direct shearing forces in order to establish the modulus of rigidity and the energy loss percycle under conditions occurring during strong earthquakes. The samples were cylinders 2.41 in. in diameter and approximately 1 in. in unconfined height between shear planes. The amplitudes of the deformations were limited to a few thousandths of an inch, and the frequenceis were less than 3 cps. The most important factor affecting the modulus of rigidity was the amplitude of deformation. Variations of frequency within the range of 0.5 to 3.0 cps had very little effect on the modulus, but the creep effect became important in very slow oscillations. Amplitude was also the most important factor in the amount of energy loss per cycle.
Converse, F J
Converse Foundation Engineering Company, Pasadena, Calif.