The engineering behavior of rock masses is significantly affected by the deformation modulus. Several parameters such as confining stress and the angle between anisotropy and direction of loading affect the deformation modulus. The dilatometer is one of the most versatile instruments used for determining the in-situ modulus of deformation and has been used extensively in a site investigation program that was carried out near the city of Sanandaj in Kurdistan province, north-west of Iran. This paper discusses the effect of confining stress and the angle between anisotropy and loading direction on the deformation modulus obtained from dilato
The deformability is one of the most important properties that represent the mechanical behavior of rock masses and is used in various rock engineering projects including underground and surface structures. Rock mass deformation modulus can be measured by different methods including field testing and laboratory testing by considering the relation between the applied load and resulting deformation. It should be noted that a rock mass usually contains discontinuities and its mechanical behavior is different to that of small rock specimen tested in the laboratory. Hence large scale techniques offer advantages by testing at a more reasonable scale. The dilatometer is one of the most versatile instruments used for determining the in-situ modulus of deformation. It should be noted however, that several parameters such as confining stress and the angle between anisotropy and direction of loading affect the deformation modulus. Dilatometer testing has been used extensively in a site investigation program that was carried out near the city of Sanandaj in Kurdistan province north-west of Iran. The effect of confining stress and the angle between anisotropy and direction of loading on the obtained deformation modulus will be discussed in the following text.
A site investigation program was carried out near the city of Sanandaj which has previously been reported [1]. It is proposed to construct a dam at this location on the Javeh River in order to provide water for drinking and agricultural purposes. The investigations are aimed to provide geotechnical parameters in order to analyze the suitability of this location and also to obtain required design parameters. From geological point of view the site is located on the Sanandaj – Sirjan zone which is part of Central Iran geological zone and is seen as a long metamorphic band parallel to the Zagros Mountains. The rock mass of the foundation and abutments of the dam consists of metamorphics rock of the third geological period and can be described as grey to dark grey slate or slaty limestone with occasional calcite veins and is generally strong to very strong. There are no significant changes in the lithological and geological conditions of the dam site.meter tests carried out at Javeh Dam site.
