Long-term Deformation Mechanism of Masjed-e-Soleyman High Rockfill Dam

Articles in Press

Document Type : Article

Authors

1 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Iran

2 - Department of Civil Engineering, Iran University of Science and Technology, Iran - Present address : ‎Department of Geotechnical Engineering, School of Civil Engineering, Iran ‎University of Science ‎and Technology, Tehran 16846-13114, Iran

10.24200/sci.2024.62637.7947

Abstract

The Masjed-e-Soleyman dam, situated in southern Iran, is a rock-fill dam with a clay core, reaching a height of 178 meters. During the construction and impounding phases, notable pore water pressure was developed within the core. The dissipation rate of this pressure is considerably slow, persisting long after impounding. Nonetheless, progressive deformations and irregularities have been observed and documented on the surface of the dam's body, with no significant decrease in the rate of deformation. These deformations have raised concerns regarding the safety and stability of the superstructure. This study aims to investigate all factors influencing such deformation behavior by analyzing instrumental data and employing a mechanical-fluid three-dimensional numerical model. A modified softening-hardening constitutive model is utilized to simulate the phenomena of rock-fill particle crushing and saturated collapse within the upstream rock-fill shell materials. Additionally, a viscoelastic creep model is employed to simulate creep deformations. Subsequently, a robust hypothesis concerning the long-term mechanism of dam deformation behavior is formulated. According to this hypothesis, the main contributors to the complex behavior of this dam are the creep deformations of the rock-fill shell and the clay core's deformation under constant volume conditions.

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 13 October 2024

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History

  • Receive Date: 24 June 2023
  • Revise Date: 13 September 2023
  • Accept Date: 13 October 2024

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