Experimental study on dynamic characteristics of granular materials under axial high-frequency vibration |
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Authors: | Ye Weitao Fu Longlong Shan Yao Dai Ning Guo Peijun Zhou Shunhua Rackwitz Frank |
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Institution: | 1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, 4800 Cao’an Rd, Shanghai, 201804, China ;2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, 4800 Cao’an Rd, Shanghai, 201804, China ;3.Department of Civil Engineering, McMaster University, Main Street West.1280, Hamilton, L8S 4L7, Canada ;4.Chair of Soil Mechanics and Geotechnical Engineering, Technical University of Berlin, Berlin, Germany ; |
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Abstract: | The fundamental understanding of the behavior of granular materials by the effect of vibration is necessary to properly address a number of engineering issues, such as long-term settlement of high-speed railway, vibratory pile driving in sandy stratum, and earthquake-induced geotechnical disaster. Triaxial compression tests of dry Pingtan sand were carried out by a modified triaxial apparatus, where axial high-frequency vibration was super-imposed on the specimen at pre-peak, peak, and post-peak stress states during monotonic shearing. The influences of vibration conditions, confining pressure, and the initial relative density on the vibration-induced responses of Pingtan sand are mainly considered. It is shown that the super-imposed vibration leads to significant deviatoric stress reduction and vibro-induced additional axial strain. This owes to the fact that the static inter-particle friction turns to dynamic friction, and consequently, the frictional resistance has a considerable reduction when vibration is applied to the sand specimen. The vibration-induced stress–strain behavior of sand specimen is characterized into three states by two thresholds concerning vibration intensity and confining pressure: (1) stable state, (2) vibro-compression state and (3) vibro-instability state. For the vibro-compression state, the deviatoric stress reduction has a positive linear correlation with the increase in vibration intensity, while the vibro-induced additional axial strain follows a power-law increase with vibration intensity. Given a vibration condition, the deviatoric stress reductions and the vibro-induced additional axial strains at pre-peak, peak, and post-peak stress state follow a descending order. Besides, the influences of vibration on shear strength and critical state were also discussed.
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