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IJSTR >> Volume 6 - Issue 2, February 2017 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Ascertaining Grain Scale Effects Of Seismic Or Aseismic Stimulation Upon Strength Of Near Surface Geological Materials

[Full Text]



Bilal Hassan, Stephen D. Butt, Charles A. Hurich



characterization of granular sediments, granular rheology and relaxation, granular media force chains, stimulated granular medium reorganization, P- and S-wave response of granular medium, unconsolidated sediments seismic/aseismic response



Certain peculiarities of inelastic nonlinearity of unconsolidated near surface periodically stressed granular media contributed at micro- scale are investigated to ascertain possible anomalous time dependent strength behavior macro-effects, with geotechnical/geo-environmental implications. Comparative examination of ultrasonic P- and S-wave repeatable displacement response wave-forms, in time records and spectra, of pulse stimulated both confined dry and fully saturated ceramic grains analogue, endorsable by pertinent theory, is performed. Examination is primarily aimed at both understanding connectivity of “louder” response generated by seemingly unobtrusive “quieter” seismic and aseismic events in granular sediments. Secondarily, results impart an enhanced conceptual substantiation of some previously disseminated and/or published results. The results hint certain persistive time and frequency restricted occurrences vouching vital insights. It could be unambiguously clarified that subtle acoustic emission and/or stick-slip type micro events in stimulated i.e., seismic or aseismic, unconsolidated granular sediments do occur. When spread over time and/or space their cumulated effect may be capable of altering granular material macro strength behavior. It is clearly deducible from resonant type spectral results that material fragmentation or force chain formation type phenomenon occurs possibly due to macro-scale friction mobilization by grain-scale events. It is further speculated that invisible high frequency events may irreversibly alter grain-scale surface properties and/or intergranular friction as (pseudo) enhanced elasticity type effect, more elusive with saturation. An assessment of an examined temporal distribution of grain-scale stick-slip type events when stimulated by P- and S-wave modes is posited to be non-identical. The former, as if, is retardation associated while the latter relaxation type, in a characteristic sense. Presented result forms combined not only offer acute insights in assessing possibilities of elastic wave mode conversion in granular sediments but also evolution of grain-scale effect to a macro-scale with potential of compromising strength and stability of unconsolidated sediments.



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