Experimental study on sand shear wave velocity considering the influence of particle shape
The shapes of natural sands often vary greatly.To study the characteristics of shear wave propagation in sand with different shapes,quartz sands with three different shapes were first selected for particle shape analysis.Secondly,a triaxial apparatus equipped with a bender element system was used to conduct shear wave tests and triaxial shear tests on sand samples,obtaining the shear wave velocities and critical state lines of the three types of quartz sands.The test results indicate that:(1)under similar void ratios and confining pressures,the shear wave velocity(Vs)of the quartz sands gradually increases as the overall regularity(OR)decreases;(2)based on the state parameter in the framework of the critical state soil mechanics,a new model that allows unified characterization of shear wave velocity for quartz sand was developed,and it shows a satisfactory predictive performance by using the data from the literature;(3)on the basis of the above model,a new method using the shear wave velocity was proposed to predict the shear response of quartz sands with different shapes.The outcomes from this study provide a basis for evaluating the shear instability of complex-shaped sandy soil layers using the in-situ shear wave velocity.
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