Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Effect of subsurface cavity length on Rayleigh wave propagation to identify near and far boundary of the cavity

Document Type : Original Article

Authors
Hossein Rahnema 1
Mahmood Rasekh 2
Sohrab Mirassi 3
1 Assistant Professor, Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran
2 M. Sc. Student, Department of Civil and Environmental Engineering, Shiraz University of Technology, Shiraz, Iran
3 Assistant Professor, Department of Civil Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
10.22065/jsce.2021.299727.2530
Abstract
Subsurface identification in some cases requires seismic testing, especially when the goal is to identify anomalies at the site. Identifying and determining the dimensions of these anomalies is important because these cavities may be of considerable size and close to the ground. And cause irreversible risks by applying loading or any other changes in the soil environment. Seismic methods can also be used to identify aqueducts, mineral, oil and gas exploration. Due to various methods of identifying subsurface anomalies, in this paper, the multi-station surface wave analysis method is used, which is very fast and cost-effective. In this regard, by simulating in Abacus, finite element software environment, the effect of longitudinal dimensions of shallow subsurface cavities has been evaluated. The cavities are located at different lengths below the ground and the waves field in the time-offset and dispersion curves and graphs in the frequency-offset after the filter are examined. The obtained results in the time-distance showed that for a cavity with a length of 2, 4, 6 and 8 meters, the scattered waves are emitted from the far and near the face of the cavity with a longer time distance from each other in proportion to the increase in the length of the cavity. It can be concluded that the near and far boundary of cavity could be determined by using high resolution obtained data after filtering in time-distance domain, and more energy data in frequency-distance domain.
Keywords
Longitutal dimentions
Seismic waves
Rayleigh waves
Cavity
MASW
Disspersion curve
Wave field
F-K filter

Subjects

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Journal of Structural and Construction Engineering
Volume 9, Issue 6 - Serial Number 59
September 2022
Pages 30-50

  • Receive Date 15 August 2021
  • Revise Date 13 November 2021
  • Accept Date 25 November 2021