Geotechnical characteristics of clays in diversion tunnel of 4 Eylül dam (Sivas, Turkey)

  • Karacan E. 
  • Yilmaz I. 


This study aims to determine the geotechnical characteristics of clays in the diversion tunnel of the 4 Eylül dam which will provide the water supply of Sivas city. Index properties and geotechnical parameters were obtained by laboratory tests on disturbed and undisturbed samples collected from the soils of study area. According to XRD analysis, dominant clay mineral appears to be a smectite. Soils are generally classified as CH group soils and reveal high swelling potential. In the light of the data obtained, soils were determined as swelling clays for tunnel design, lateral pressures and floor swelling will occur during excavation. Circular ribs are required and yielding support must be used in extreme cases.


Unconfined Compressive Strength Void Ratio Strength Unconfined Compression Expansive Soil Geotechnical Characteristic 

Caractéristiques géotechniques des argiles dans un tunnel de dérivation du barrage d'Eylül (Sivas, Turquie)


Cette étude vise à déterminer les caractéristiques géotechniques des argiles dans un tunnel de dérivation du barrage f'Eylül qui doit alimenter en eau la ville de Sivas. Les mesures ont été réalisées, en laboratoire sur des échantillons intacts et remaniés. L'analyse aux Rx a montré que l'argile dominante est la smectite. Les sols correspondent généralément au groupe CH dans la classification U.S.C.S., avec un potentiel de gonflement important. A la lumière des résultats obtenus, des pressions latérales et un gonflement du plancher doivent être attendus lors de l'excavation. Des cintres circulaires sont nécessaires et des supports élastiques dans les cas-limites.


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Copyright information

© International Association of Engineering Geology 1996

Authors and Affiliations

  • Karacan E. 
    • 1
  • Yilmaz I. 
    • 1
  1. 1.Department of Geological EngineeringCumhuriyet UniversitySivasTurkey

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