Abstract
Volcanic rocks from the Bodrum Peninsula have been studied to establish a relationship between the uniaxial compressive strength (UCS), Young’s modulus (E) and Schmidt hammer rebound number (N). Test results obtained on andesites, basalts and tuffs have been assessed statistically and the parameters obtained correlated. Regression equations were established between N, E and UCS.
The study suggests the following empirical relationships: UCS=2.75 N−36.83, E=0.17 UCS+0.28 and E=0.47 N−6.25. The relationships are somewhat different from the correlations suggested by previous studies and should therefore be used only for andesites, basalts and tuffs with degrees of weathering and mineralogical structure similar to those used in the present study. The results obtained using solely the Schmidt hammer test for estimating mechanical properties of rocks are less accurate than when a full suite of laboratory tests is carried out but it is hoped that these empirical equations will help geotechnical engineers making practical decisions at a preliminary site investigation stage.
Résumé
Les roches volcaniques de la péninsule de Bodrum ont été étudiées afin d’établir une relation entre la résistance à la compression simple (UCS), le module d’Young (E) et l’indice de rebond au marteau de Schmidt (N). Les résultats obtenus sur des andésites, des basaltes et des tufs ont fait l’objet de traitements statistiques. Des corrélations ont été établies entre les paramètres N, E et UCS.
L’étude conduit à retenir les relations empiriques suivantes: UCS=2,75 N−36,38; E=0,17 UCS+0,28 et E=0,47 N−6,25. Les relations obtenues sont quelque peu différentes de celles résultant d’études antérieures et, de ce fait, ne doivent être utilisées que pour des andésites, des basaltes et des tufs, présentant par ailleurs des compositions minéralogiques et des degrés d’altération similaires à ceux des roches considérées dans cette étude. Les résultats obtenus à partir du seul essai au marteau de Schmidt, pour estimer les propriétés mécaniques des roches, sont moins précis que si des essais mécaniques de laboratoire sont réalisés mais on espère que ces relations empiriques aideront les ingénieurs géotechniciens pour des décisions pratiques au stade des reconnaissances préliminaires de site.
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Dinçer, I., Acar, A., Çobanoğlu, I. et al. Correlation between Schmidt hardness, uniaxial compressive strength and Young’s modulus for andesites, basalts and tuffs. Bull Eng Geol Environ 63, 141–148 (2004). https://doi.org/10.1007/s10064-004-0230-0
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DOI: https://doi.org/10.1007/s10064-004-0230-0