Analysis of faulting under foundation in Emarat dam, due to impounding, using numerical modelling by Plaxis software

Document Type : Original Article

Authors

1 Beheshti Avenue-Gorgan-Iran

2 Post Graduate in Tarbiat Modarres University

Abstract

For completing of studies about influences of stress changes due to impounding on foundation failure and bulk stability of large dams, the analysis of foundation failure probability due to dam impounding is necessary. Therefore, the Emarat under-construction dam (Ardabil Province) is selected as a case study for 2D numerical modelling on the basis of finite elements with applying complete non-linear analyzing with using Plaxis software. For this aim, the high resolution engineering geology was performed on Dam site and its reservoir and therefore, the needed parameters for modelling, such as compressive and uniaxial strength in dry and saturation situation, were evaluated. Then, the 2D modelling was performed by Plaxis software and the probability of foundation failure was surveyed. The results showed that after impounding and raising of pore pressure, the calculated Mohr circle of selected critical point is migrated toward the coordinate center and then, semi-tangent to failure envelope which demonstrated that failure probability of foundation is caused due to dam impounding in Emarat under constructed dam. Also, we prospect that after impounding, the existent old fault zones (as second order related to main faults) with normal and/or strike-slip components, such as Balan fault which located to dam adjacent, will activate instead of forming of new fractures.

Keywords

Journal of Tectonics
Volume 6, Issue 22 - Serial Number 22
September 2023
Pages 15-32

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