Assessment of dynamic and static characteristics of igneous bedrock by means of suspension P-S logging and uniaxial compressive strength tests

Emre Biringen, John Davie

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: In Situ Testing

ABSTRACT: This paper provides correlations between the values of P-wave velocity and dynamic elastic modulus through in-situ dynamic testing (suspension P-S logging) and the values of uniaxial compressive strength (UCS) and static elastic modulus through laboratory static testing (uniaxial compressive) of sound rock from two sites located in South Carolina and Virginia. For both sites, the bedrock, which classified as good to excellent, is hard fresh to slightly discolored metamorphic rock, or igneous rock with numerous metamorphic inclusions. Suspension P-S logging tests were performed in 12 uncased fluid-filled boreholes, to rock depths of over 120 m. The investigation further included the results of unconfined compression tests on rock cores and assessment of the variation of static elastic modulus with UCS from these compression tests. The comparisons show that the low strain elastic moduli values of sound rock agree well with the higher strain values obtained from the unconfined compression tests.

RÉSUMÉ: Ce document fournit des corrélations entre les valeurs de vélocité d' ondes-P et module dynamique d'élasticité par le biais de terrain des essais dynamiques (suspension P-S logging), et les valeurs de résistance uniaxiale à la compression et module statique d'élasticité des essais laboratoires statiques (uniaxial compression) de rocher solide de deux sites aux Étas-Unis, situés dans la Caroline du Sud et en Virginie. Pour les deux sites, le substrat rocheux) , classé comme bon jusqu'à excellent, est entre dur fraîche du roc igné légèrement décoloré avec de nombreuses inclusions métamorphiques. Des essais fisuspension P-S loggingfl ont été effectués en 12 trous de fourage sans revêtement remplis de liquide, dans des profondeurs de roc dépassant les 120 m. L'enquête a inclus les résultats des essais de compression non-restreinte des carottes rocheux, et l'évaluation de la variation de statique du module élastique statique avec résistance uniaxiale de ces tests de compression. Les comparaisons montrent que les valeurs des modules elastiques d™une faible souche de roc solide conviennent bien aux valeurs obtenues des tests de compression non-restreinte.

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Cite this article:
Emre Biringen; John Davie (2011) Assessment of dynamic and static characteristics of igneous bedrock by means of suspension P-S logging and uniaxial compressive strength tests in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper801,author = Emre Biringen; John Davie ,title = Assessment of dynamic and static characteristics of igneous bedrock by means of suspension P-S logging and uniaxial compressive strength tests ,year = 2011}