Volume 12, Issue 2 (11-2012)
2012, 12(2): 393-410 |
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Tadbiri S, Almasian M, Pourkermani M. Survey of the role of tectonic structures and insitu stress phases on instability of Northern slope of Chah-Savar-Agha quarry. Journal title 2012; 12 (2) :393-410
URL: http://jsci.khu.ac.ir/article-1-1477-en.html
URL: http://jsci.khu.ac.ir/article-1-1477-en.html
1- Student of islamic Azad university North Tehran branch
Abstract: (6815 Views)
Introduction and purpose : Chah-Savar-Agha quarry, the quarry which belongs to Neyriz marble quarries complex, is one of the important economical center in the Fars province. In recent years, some slumps and instabilities have occurred in this area and this phenomenon increases the importance of structural studies and investigation of tectonic stress specially insitu stresses. Therefore, the main purpose of this research is the investigation the role of tectonic structures such as joints, fractures, insitu stress phases and effects of them on instabilities of the northern slope.
Method :
By field studies and measurement the geometrical characteristics of the fractures, including dip and dip direction of joints, fillings and the number generations of filling, they are analysed by DIPS5.1 software to achieve the structural analysis and reach to the insitu stress phases.
Results :
According to the results, at least two insitu stress phases are acceptable in the area.
- Releasing stress phase : this stress phase with the South West- North East trend has caused the reactivation of some old joints and creation of some young fractures in the area. The releasing stress phase has been created by rapid extraction from the quarry.
- Local tensional phase :
Field observations have indicated that the Northern slope was creeping in the North East direction and this phenomenon has created the tensional stress phase with the East- West trend in the area and this stress phase has created some vertical fractures with the North-South trend also.
The creep mechanism in the Northern slope has been created by burden of debris which have been accumulated on the top of Northern slope.
Burden of these debris has created the vertical stress that has caused the creep mechanism upon a fracture with N152/50NE identity in the South East Strike.
Method :
By field studies and measurement the geometrical characteristics of the fractures, including dip and dip direction of joints, fillings and the number generations of filling, they are analysed by DIPS5.1 software to achieve the structural analysis and reach to the insitu stress phases.
Results :
According to the results, at least two insitu stress phases are acceptable in the area.
- Releasing stress phase : this stress phase with the South West- North East trend has caused the reactivation of some old joints and creation of some young fractures in the area. The releasing stress phase has been created by rapid extraction from the quarry.
- Local tensional phase :
Field observations have indicated that the Northern slope was creeping in the North East direction and this phenomenon has created the tensional stress phase with the East- West trend in the area and this stress phase has created some vertical fractures with the North-South trend also.
The creep mechanism in the Northern slope has been created by burden of debris which have been accumulated on the top of Northern slope.
Burden of these debris has created the vertical stress that has caused the creep mechanism upon a fracture with N152/50NE identity in the South East Strike.
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