Analysis of shear wave velocity estimation using MASW on sloping grounds

• Autorzy: Vishwakarma Prabhakar , Singh Bora Sanjay , Prashant Amit

Identyfikatory

DOI

10.1007/s11600-024-01382-8

• Języki publikacji: EN

Abstrakty

EN

Applying the multichannel analysis of surface waves (MASW) test in sloping ground conditions is of significant interest in the geotechnical investigation when estimating a subsurface shear wave velocity (V_s) profile. The soil stratification in sloping ground violates the assumption of the horizontal soil layer in the vertically heterogeneous medium and results in misinterpretation of the V_s profile in a MASW test. One of the major challenges in this context is to identify an effective frequency range that can be used to invert the dispersion curves. This study presents a methodological framework to address the issues mentioned above. The analysis involves finite element (FE) simulations for a homogeneous sloping soil model and a six-layer sloping soil model, along with the field test validation. The wavefield was recorded for the duration of 0.3 s with a sampling frequency of 4000 Hz. Spectral characteristics of the recorded wavefield, such as attenuation of Fourier amplitudes as a function of offset distance and amplification/de-amplification of the wave amplitude (through different velocity layers), were examined. Moreover, the variation of unwrapped phases and cross power spectrum (CPS) between each pair of receivers was analyzed to identify the effective frequency range of dispersion curves. Finally, the proposed approach was successfully validated using a comparison of the V_s profiles obtained from field MASW and downhole seismic tests.

Słowa kluczowe

EN

Fourier amplitude spectrum; downhole test; cross power spectrum MASW test; unwrapped phase; Vs profile

PL

widmo amplitudy Fouriera; test otworowy

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2025
• Tom: Vol. 73, no. 1
• Strony: 359--378
• Opis fizyczny: Bibliogr. 47 poz.

Twórcy

autor

Vishwakarma Prabhakar

• Department of Civil Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar 382055, India

autor

Singh Bora Sanjay

• GNS Science, Lower Hutt, New Zealand

autor

Prashant Amit

• Department of Civil Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar 382055, India

• https://orcid.org/0000-0002-0841-5951

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025).