Effects of site stiffness and source to receiver distance on surface wave tests' results

Kumar, Jyant and Naskar, Tarun (2015) Effects of site stiffness and source to receiver distance on surface wave tests' results. In: SOIL DYNAMICS AND EARTHQUAKE ENGINEERING, 77 . pp. 71-82.

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Abstract

By using six 4.5 Hz geophones, surface wave tests were performed on four different sites by dropping freely a 65 kg mass from a height of 5 m. The receivers were kept far away from the source to eliminate the arrival of body waves. Three different sources to nearest receiver distances (S), namely, 46 m, 56 m and 66 m, were chosen. Dispersion curves were drawn for all the sites. The maximum wavelength (lambda(max)), the maximum depth (d(max)) up to which exploration can be made and the frequency content of the signals depends on the site stiffness and the value of S. A stiffer site yields greater values of lambda(max) and d(max). For stiffer sites, an increase in S leads to an increase in lambda(max). The predominant time durations of the signals increase from stiffer to softer sites. An inverse analysis was also performed based on the stiffness matrix approach in conjunction with the maximum vertical flexibility coefficient of ground surface to establish the governing mode of excitation. For the Site 2, the results from the surface wave tests were found to compare reasonably well with that determined on the basis of cross boreholes seismic tests. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
Publisher:	ELSEVIER SCI LTD
Additional Information:	Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Keywords:	Dispersion; Non-destructive testing; Rayleigh wave; Shear wave velocity; Surface wave tests
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	24 Sep 2015 06:55
Last Modified:	24 Sep 2015 06:55
URI:	http://eprints.iisc.ac.in/id/eprint/52431

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