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Evaluation of the Stiffness of a Synthetic Soft Rock using Bender Elements
thesisposted on 25.08.2021, 00:33 authored by Michael von't Steen
Significant strength and stiffness come from the intact structure of soft rock, however, conventional drilling, sampling and extraction disturbs the material structure and results in a under representation of measured parameters. Non-destructive wave-based methods instead preserve the material structure, but the stiffness is measured at smaller strains than typically encountered in geotechnical applications. Experiments were conducted on a synthetic hard soil/ soft rock at different moisture contents using bender elements and compared to conventional unconfined compressive testing. Design curves were developed that allows a stiffness measured using bender element wave based methods to be scaled to any other intermediate strain.