Determining the shear wave speed of the construction site by multi-channel analysis of surface waves (MASW) and preparing shear wave speed zoning maps up to 30 meters deep with the GIS geographic information system (Shahroud case study)

Authors

1 PhD Student in Geotechnical Engineering, Faculty of Civil Engineering, Shahrood University of Technology, Shahrood, Iran.

2 Assistant Professor, Faculty of Civil Engineering, Shahrood University of Technology, Shahrood, Iran.

Abstract

The speed of shear waves is one of the most important and necessary parameters in geotechnical studies, which is used in evaluating the strength of subsurface layers, the effects of construction, and determining the profile of subsurface layers. One of the methods of direct determination of shear wave speed is the downhole seismic method, which is a destructive, time-consuming and expensive method. In contrast to this method, a method called multi-channel analysis of surface waves has been introduced, which is a non-destructive, fast and low-cost geophysical method. In fact, this method is based on the production and recording of seismic waves on the surface of the earth, changing the domain of data from the domain of time-distance to the domain of frequency-phase speed using two-dimensional Fourier transform and finally obtaining the speed of Rayleigh waves at certain frequencies (splash curve). . In this study, firstly, the multi-channel analysis method of surface waves is briefly described, and then the results of 12 MASW tests conducted on the surface of Shahrood and the zoning maps obtained from the results of the analysis of these tests, which are up to a depth of 30 meters using geographic information system GIS is provided. The obtained results show that in more than 90% of the areas of Shahrood city, the average shear wave speed (VS) is between 750-350 m/s, so the soil type of most areas of Shahrood is type II based on the 2800 standard.

Keywords

References

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Volume 8, Issue 4
October 2030
Pages 315-326

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