Evaluation of dynamic properties of municipal solid waste sites by geophysical tests

Naveen, BP and Sitharam, TG and Sivapullaiah, PV (2017) Evaluation of dynamic properties of municipal solid waste sites by geophysical tests. In: Journal of Solid Waste Technology and Management, 43 (4). pp. 273-279.

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Abstract

Landfill design needs to consider dynamic properties for safety not only under static conditions, but also under dynamic loading conditions. In recent years, geophysical surveys are becoming popular mainly to understand the profiles within the landfills and estimate its dynamic properties like shear wave velocity, shear modulus and Poisson's ratio. Shear wave and P-wave velocity (Vs, Vp) are very well related to the dynamic properties of soil at lower strains. Geophysical tests provide a direct measurement of Vs and hence widely accepted for the seismic site char-acterization purpose. In this study, seismic survey was performed using Multi channel Analyzer of Surface Waves (MASW) technique at Mavallipura landfill site, Bangalore. MASW test in-volves three steps: data acquisition, construction of a dispersion curve (showing the variation of phase velocity among various frequencies), and inversion of the dispersion curve to get shear wave (Vs) profile from the calculated dispersion curve. The typical MASW test setup used for the present study consists of 24-channel geode seismograph and 24 geophones of 4.5 Hz ca-pacity. Seismic data were recorded using geode seismograph with sledge hammer source on one side of the landfill and geophones on the other side with 1m spacing of geophones. The landfill was surveyed up to a length of about 25m from the top level. The deposit consisted of uncompacted waste up to a depth 6m with Shear wave velocity of 74 to 130m/s. Series of 1-D MASW tests have been carried out to map the entire solid waste site and the results will be presented in the paper. Overall, the results from the study showed that seismic surveys have the potential to capture the changes in dynamic properties like shear wave velocity and Pois-son's ratio with respect to depth of MSW landfill to infer the extent of degradation and provide dynamic properties needed for seismic stability evaluations.

Item Type:	Journal Article
Publication:	Journal of Solid Waste Technology and Management
Publisher:	Widener University School of Civil Engineering
Additional Information:	The copyright for this article belongs to Widener University School of Civil Engineering.
Keywords:	Acoustic wave velocity; Data acquisition; Dispersion (waves); Dynamic loads; Elastic moduli; Geological surveys; Geophysics; Land fill; Poisson ratio; Seismic response; Seismic waves; Seismographs; Seismology; Shear flow; Shear strain; Shear waves; Soil testing; Solid wastes; Surface waves; Surveys; Testing; Velocity; Wave propagation, Direct measurement; Dispersion curves; Dynamic loading conditions; Geophysical surveys; Multi-channel analyzer; Seismic stability evaluation; Shear wave velocity; Static conditions, Municipal solid waste
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	25 Jul 2022 09:31
Last Modified:	25 Jul 2022 09:31
URI:	https://eprints.iisc.ac.in/id/eprint/74719

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