Empirical relationships of shear wave velocity, SPT-N value and vertical effective stress for different soils in Mashhad, Iran

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Published: Jul 27, 2015
DOI: https://doi.org/10.4401/ag-6635
Keywords:
Shear wave velocity, Vertical effective stress, Standard penetration test, Downhole test, Empirical relations, Mashhad, Iran

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Azam Ghazi
Ferdowsi University of Mashhad, Department of Geology, Mashhad,
Naser Hafezi Moghadas
Ferdowsi University of Mashhad, Department of Geology, Mashhad,
Hosein Sadeghi
Ferdowsi University of Mashhad, Department of Geology, Mashhad,
Mohamad Ghafoori
Ferdowsi University of Mashhad, Department of Geology, Mashhad,
Gholam Reza Lashkaripur
Ferdowsi University of Mashhad, Department of Geology, Mashhad,

Abstract

Shear wave velocity, Vs, is one of the important input parameters in seismic response analysis of the ground. Various methods have been examined to measure the soil Vs directly. Direct measurement of Vs is time consuming and costly, therefore many researchers have been trying to update empirical relationships between Vs and other geotechnical properties of soils such as SPT Blow count, SPT-N. In this study the existence of a statistical relationship between Vs, SPT-N60 and vertical effective stress, signanu´, is investigated. Data set we used in this study was gathered from geotechnical and geophysical investigations reports. The data have been extracted from more than 130 numbers of geotechnical boreholes from different parts of Mashhad city. In each borehole the Vs has been measured by downhole method at two meter intervals. The SPT test also has performed at the same depth. Finally relationships were developed by regression analysis for gravels, sands and fine grain soils. The proposed relationships indicate that Vs is strongly dependent on signanu´. In this paper the effect of fine percent also is considered on the Vs estimation.

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How to Cite
Ghazi, A., Hafezi Moghadas, N., Sadeghi, H., Ghafoori, M. and Lashkaripur, G. R. (2015) “Empirical relationships of shear wave velocity, SPT-N value and vertical effective stress for different soils in Mashhad, Iran”, Annals of Geophysics, 58(3), p. S0325. doi: 10.4401/ag-6635.
Issue
Vol. 58 No. 3 (2015)
Section
Seismology

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