Abstract
The article presents the comparison analysis between deformation field from numerical model and shear wave (S-wave) velocity field obtained from seismic interferometry (SI). Tests were conducted on active Just-Tęgoborze landslide. Geologically, the study area lies in Magura Nappe in the Outer Carpathians. The landslide’s flysch bedrock is covered by Quaternary colluvium built of clays and weathered clayey-rock deposits. During geotechnical investigation, properties of landslide body were established and failure surfaces were distinguished. In order to obtain S-wave velocity models, one-hour of ambient seismic noise was recorded by 12 broadband seismometers. As a result of data processing with SI method, Rayleigh surface wave propagation was reconstructed. The analysis of dispersion curves allowed to estimate a two dimensional S-wave velocity field. The deformation field were calculated assuming an elastic-plastic Coulomb-Mohr strength criterion. Images of shear strain increment, and values of factor of safety of the slope were obtained as a result of calculation. The comparison of the results indicates the similar characteristic features in the S-wave velocity field and the field of deformation calculated numerically.
Highlights
Recognition and characterization of the slopes prone to mass movements are the main tasks in landslide hazard evaluation [1, 2]
We present a comparison study of shear wave (S-wave) velocity field obtained from seismic interferometry and the results of slope stability analysis obtained from numerical calculations for Just-Tęgoborze landslide
Regarding the geological-engineering cross-section, we can correlate the near surface Swave velocity layer with the clayey colluvium – it is prone to changes caused by water infiltration
Summary
Recognition and characterization of the slopes prone to mass movements are the main tasks in landslide hazard evaluation [1, 2]. Seismic interferometry as a passive seismic method, has been developed and successfully applied to landslide subsurface characterization and monitoring mass movements, with the analysis of shear wave (S-wave) velocity field [6, 8,9,10,11,12,13]. The slope stability analysis is often performed with use of numerical modelling and could be very helpful for better comprehension of landslide phenomena. Shear strength reduction method (SSR) is widely applied for numerical two-dimensional (2D) and three-dimensional (3D) stability analyses [15]. The advantages and disadvantages of SSR method over the limit equilibrium method were discussed in [16, 17]
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