Statistical analyses of discontinuity parameters of Gölbaši (Ankara) Andesites, Süpren (Eskišehir) marble, and Porsuk Dam (Eskišehir) peridotite in Turkey

  • V. Doyuran
  • C. Ayday
  • N. Karahanoglu


In this study aperture, persistence and spacing of discontinuities measured from three different rock types are treated statistically to determine their frequency distributions. Andesites of Gölbaši-Ankara, the marble of Süpren-Eskišehir and the peridotite of Porsuk Dam-Eskišehir are selected as rock types for which scan line surveys have been carried out.

Statistical analyses are aimed at evaluating the distribution parameters, histograms, moments around zero, and moments around the mean of each set of data. The parameters are then utilized for making comparisons between the theoretical and the observed frequency distributions by means of Chi-Square tests and the method of Cross Correlations.

Results of the statistical analyses have shown that the frequency distributions may not be the same in all rock types. The degree of weathering affects the frequency distribution of discontinuity spacing even in the same rock.


Rock Type Moment Deviation Discontinuity Spacing Observe Frequency Distribution Gamma Type 

Analyses statistiques des paramètres de discontinuités dans les Andésites de Gölbaši (Ankara), marbres de Süpren (Eskišehir) et péridotites du barrage de Porsuk (Eskišehir) en Turquie


Dans ce travail, l'ouverture, la longuer et l'espacement entre les discontinuités mesurées sur trois différents types de roches sont traitées statistiquement pour déterminer leur distribution fréquentielle. Les andésites de Gölbaši-Ankara, les marbres de Süpren-Eskišehir et les péridotites du barrage de Porsuk-Eskišehir ont été choisis.

Les analyses statistiques des paramètres mesurés ont permis de faire une comparaison entre les distributions de fréquence théorique et observée à l'aide des tests des moindres carrés et de la méthode des corrélations.

Les résultats des analyses statistiques ont montré que les distributions de fréquance ne sont pas nécessairement les mêmes pour tous les types de roches. Le niveau d'altération influence la distribution des espacements entre les discontinuités y compris dans un même type de roches.


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Copyright information

© International Association of Engineering Geology 1993

Authors and Affiliations

  • V. Doyuran
    • 1
  • C. Ayday
    • 2
  • N. Karahanoglu
    • 1
  1. 1.Department of Geological EngineeringMETUAnkaraTurkey
  2. 2.Department of Mining EngineeringAnadolu UniversityEskišehirTurkey

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