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Dynamic Properties of Surface Liquefied Site Silty-Sand of Tripura, India

Conference paper
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Part of the Sustainable Civil Infrastructures book series (SUCI)

Abstract

Due to increase in the rate of occurrence of earthquakes and associated damages, site-specific dynamic models are attracted to research in the recent past. The shear modulus degradation curve, damping characteristics and shear wave velocity profile are indispensable input properties required for carrying out the site response analysis. However, most of the site response studies are being carried out using existing dynamic model developed for generic soil. In the present study, results of resonant column and cyclic triaxial tests on reconstituted dry silty-sands specimens obtained from the recently liquefied site of Tripura, India is presented. The shear modulus degradation curve and damping ratio for a low (<10−3) to high strain range (up to 5%) are presented and compared with the available well-known curves and discussed. Also, the effects of confining pressure and relative density on dynamic properties are presented. Further, comparison has been made between the shear wave velocity measured in the liquefied field using Multichannel Analysis of Surface Waves (MASW) and laboratory results of low strain shear wave velocity. These results can be used for amplification estimation or micro-zonation studies in Tripura.

Keywords

Shear modulus Damping Silty-sands Resonant column Cyclic triaxial In-situ shear wave velocity 

Notes

Acknowledgment

The authors thank the Board of Research in Nuclear Sciences (BRNS) of the Department of Atomic Energy (Dae), Government of India for funding the project titled “Probabilistic seismic hazard analysis of Vizag and Tarapur considering regional uncertainties”, Ref: BRNS/36016-2016.

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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringIndian Institute of ScienceBangaloreIndia

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