Variation of Shear Wave Velocity and Liquefaction Resistance of Toyoura Sand Under Constant Specimen Density

Abstract eng:
In order to investigate variation of shear wave velocity and liquefaction resistance of Toyoura sand specimen with relative density of 50%, which is caused by the different number of cyclic loading histories, first, a series of shear wave velocity measurement were conducted. It was found that the shear wave velocity of the specimen increases with increase in the number of drained cyclic loading history. Second, undrained cyclic triaxial tests were conducted on the above-mentioned specimens. The liquefaction resistance increases with a large number of cyclic loading history, and there is good correlation between shear wave velocity and liquefaction resistance. However, both the shear wave velocity and liquefaction resistance of the specimen with 2000 cyclic loading history and those with 3000 cyclic loading history are similar to each other which indicate an upper limit of shear wave velocity and liquefaction resistance under the given specimen density. Third, in order to obtain a lower limit of shear wave velocity and liquefaction resistance, another series of experiments were performed on a specimen which has several liquefaction histories. The result shows that the smallest values of the shear wave velocity and liquefaction resistance of the specimen were measured at the second stage of liquefaction test. For Toyoura sand specimen with relative density of 50%, the upper limits of shear wave velocity and liquefaction resistance are about 16% and 250% larger than their lower limits respectively.

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