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Structural assessment works sought for Enguri dam in Georgia

LLC Engurhesi, the state owner-operator of the Enguri dam and associated 1300 MW hydropower plant in the northwest of Georgia, is seeking the support of an expert consultant to undertake engineering studies to assess the arch dam, which was commissioned in 1978, and ensure its long-term reliable operation. Requests for proposals are invited by 12 June.

Geotechnical, geophysical, and geodetic surveys conducted by Geodynamics Research Center (LLC CGI) of Russia over the last few years has shown that as the right slope of the dam foundation is weaker than the left, the residual deformation on the right slope has increased, and as a result the dam has begun to move to the right side. During high water levels in the reservoir, there is a shortage of stress in the left bank, leading to the appearance of weakened zones in the massif and the development of cracks. The loading and processing of the reservoir, and accordingly the loading and unloading of the foundation, will in future reduce bearing capacity of the foundation contact zone, increase deformations in the dam. Geophysical studies have shown that such anomalous zones are more likely to be on the left bank. As such, the situation requires urgent assessment of how to stabilise the structure and ensure the long-term reliable operation of the dam and its foundation. The client requires the development of a policy paper as well as a number of stakeholder’ workshops to better understand options,  identify a preferred approach as well as secure some commitment for action from key stakeholders.

Specifically, the scope of services to be undertaken are as follows: (1) Synthesis and analysis of data on the present-day state of the rock massif at the dam’s foundation; (2) Additional investigations aimed to specify engineering-geological conditions of rock massif at the Enguri dam foundation; (3) Elaboration of the arch dam foundation model; (4) Inspection of the dam’s body state; (5) Elaboration of the computational models of the ‘arch dam – dam’s foundation’ system; (6) Numerical modelling; (7) Design of rock mass strengthening at the Enguri dam foundation and abutments that should ensure its reliable operation; (8) Design of the rehabilitation and further improvement of the field monitoring system; (9) Results assessment and project implementation strategies. The assignment is expected to take at least 12 months, starting in September 2021.

The full tender notice and a full description of the assignment as well as detailed technical and financial requirements; any information on lots; the expected outcome; eligibility and qualification requirements; contract start date and planned contract duration, and response requirements can be accessed free of charge on the EBRD Client E-Procurement Portal (ECEPP). Prospective participants can access the procurement tender via https://ecepp.ebrd.com/respond/5B6786T77R.

Participants must use the ECEPP message centre for communication with the client. For further information, contact: Malkhaz Tskvitishvili, Engurhesi LLC, 8, Anna Politkovskaya street, Tbilisi

0186, Georgia; Tel.: +995 32 218 9669; E-mail: malkhaz@engurhesi.ge

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