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Abstract
ABSTRACTThe objective of this study is to investigate the effects of dam–reservoir interaction (DRI) on the nonlinear seismic response of earth dams. Although DRI effects have for long been considered as insignificant for earth dams, that conclusion was mainly based on linear elastic investigations which focused only on the acceleration response of the crest without examining the seismic shear stresses and strains within the dam body. The present study explores further the impact of DRI focusing on the nonlinear behavior of earth dams. The effects of reservoir hydrodynamic pressures are investigated in terms of both seismic dam accelerations and nonlinear dynamic soil behavior (seismic shear stresses and strains). It is shown that although dam crest accelerations are indeed insensitive to DRI, the stress and strain development within the dam body can be significantly underestimated if DRI is ignored.
Highlights
The dynamic behavior of a dam with a full reservoir is known to be different from that of a dam with an empty reservoir
This paper describes an investigation carried out to assess the effects of the dam-reservoir interaction (DRI) on the nonlinear seismic behavior of dams
This study considers further the effects of dam–reservoir interaction (DRI) by investigating the response of a well-documented earth dam employing nonlinear finite element analysis
Summary
The dynamic behavior of a dam with a full reservoir is known to be different from that of a dam with an empty reservoir. The developed hydrodynamic pressures [Chopra, 1968; Chopra, 1995] affect the motion of the dam, while the dam response influences in turn the dynamic response of the reservoir. This phenomenon is termed dynamic dam–reservoir interaction (DRI) and it could be catastrophic in cases of resonance, that is when the two domains (dam and reservoir) are vibrating in phase. Several methods exist, including finite element (FE) [Demirel, 2015] and boundary element (BE) approaches or coupled BE-FE [Antes and Von-Estorff, 1987; Yazdchi et al, 1999]. Relevant recent studies concentrated on the coupled problem of DRI [Wang et al, 2012; Wang et al, 2013; Hariri-Ardebili and Kianoush, 2015; Omidi and Lotfi, 2017] using various numerical approaches [Von Estorff and Antes, 1992; Samii and Lotfi, 2012; Lotfi and Zenz, 2016]
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