Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Investigating the effects of saturation of dam concrete on linear and nonlinear seismic behavior of concrete gravity dam

Document Type : Original Article

Authors
Mohamad Hoseyin Ghaniyoun 1
Amir Javad Moradloo 2
Kiarash Naser Asadi 2
1 PhD student- Department of Civil Engineering , School of Engineering- َIslamic Azad University, Zanjan branch- Zanjan-Iran
2 Associate Professor-Department of Civil Engineering, School of Engineering, University of Zanjan- Zanajan- Iran
10.22065/jsce.2023.402852.3150
Abstract
In this study, the linear and nonlinear seismic behavior of the Koyna dam has been investigated for the condition of the dam with unsaturated concrete and the dam with a combination of saturated and unsaturated environment. For this purpose, using Abaqus software the boundary line between the saturated and unsaturated environment has been determined. In the following, various parameters of saturated concrete have been evaluated. Finally, linear and nonlinear analyzes have been performed under the effect of the Koyna earthquake. To model the nonlinear behavior of concrete, the CDP behavior model has been used. The results show that the saturation of the dam has reduced the maximum values of displacements in linear and non-linear mode. In the linear analysis, the amount of reduction of the maximum horizontal displacement in the saturated state compared to the unsaturated state for the reservoir up to the height level of 36, 66.5 and 103 meters is equal to 17.34%, 24.00% and 17.30%, respectively. Also, in the non-linear analysis, the reduction of the maximum horizontal displacement in the saturated state compared to the unsaturated state for the reservoir up to the height level of 36, 66.5 and 103 meters is equal to 31.58%, 30.72% and 22.38%, respectively. For the condition of the dam with a saturation elevation lower than the downstream slope change elevation, the maximum values of the first and third principal stresses in the linear analysis and the amount of damage in the nonlinear analysis have decreased. For a case of the full reservoir where the downstream slope change is saturated, the amount of cracking in the entire structure has decreased, but it has increased in the downstream and upstream slope change location. Finally, Results show that it is necessary to evaluate the behavior of the dam with saturated and unsaturated environment simultaneously.
Keywords
Concrete gravity dam
Seismic analysis
Water-structure interaction
saturated and unsaturated concrete
Finite Element Method

Subjects

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  • Receive Date 25 June 2023
  • Revise Date 16 October 2023
  • Accept Date 02 November 2023