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Estimation of strength and deformation properties of Quaternary caliche deposits

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Abstract

The aim of this study was to develop and evaluate statistical models for predicting the uniaxial compressive strength (UCS) and average Young’s modulus (E av) for caliches, using some index and physical properties. The caliche samples, from Adana, southern Turkey, were of low strength and difficult to sample. X-ray diffraction and microscopy were undertaken and the following physical parameters established: unit weight, apparent porosity, Schmidt rebound number, Shore hardness, P-wave velocity, slake durability, point load, uniaxial compressive strength and average Young’s modulus. Simple and linear regression variable selection analyses were performed. The best relationships were obtained for UCS with P-wave velocity and unit weight and for average Young’s modulus with P-wave velocity, porosity and slake durability. Empirical equations are proposed, although it is emphasised that these may only be applicable for caliche of a similar geological character.

Résumé

Le but de cette étude est d’établir et d’évaluer des modèles statistiques permettant de prédire la résistance à la compression simple et le module d’Young de calcrètes à partir de quelques indices et propriétés physiques. Les échantillons de calcrètes d’Adana, dans le sud-est de la Turquie, présentent de faibles résistances et leur échantillonnage est difficile. Des analyses par diffractométrie RX et des observations microscopiques ont été réalisées. Les paramètres physiques suivants ont été déterminés: poids spécifique, porosité, indice de rebond de Schmidt, dureté Shore, vitesse des ondes P, indice d’altérabilité, résistance à l’écrasement entre pointes, résistance à la compression simple et module d’Young. Des analyses de régression linéaire entre ces paramètres ont été réalisées. Les meilleures relations ont été obtenues pour la résistance à la compression simple fonction de la vitesse des ondes P et du poids spécifique et pour le module d’Young fonction de la vitesse des ondes P, de la porosité et de l’indice d’altérabilité. Des équations empiriques ont été proposées, tout en soulignant que ces équations ne sauraient être utilisées que pour des calcrètes aux caractéristiques géologiques semblables.

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Acknowledgments

This study was supported by TÜBİTAK (Project No: 104Y189). The authors would also like to thank the Çukurova University Scientific Research Project Unit for providing financial support (Projects No: MMF-2004BAP-11 and MMF-2004D-19).

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Authors and Affiliations

  1. Department of Technical Programs, Vocational High School, Adıyaman University, Adıyaman, 02240, Turkey

    İsmail Dinçer

  2. Department of Geological Engineering, Faculty of Engineering-Architecture, Çukurova University, Balcalı, 01330, Adana, Turkey

    Altay Acar

  3. Department of Mining Engineering, Faculty of Engineering-Architecture, Çukurova University, Balcalı, 01330, Adana, Turkey

    Suphi Ural

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  1. İsmail Dinçer
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  2. Altay Acar
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Correspondence to İsmail Dinçer.

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Dinçer, İ., Acar, A. & Ural, S. Estimation of strength and deformation properties of Quaternary caliche deposits. Bull Eng Geol Environ 67, 353–366 (2008). https://doi.org/10.1007/s10064-008-0146-1

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