Technical Specifications

Enguri HPP
on the ENGURI River:

Building start date - 1961y.

Date of release - 1978y.


Parametters:

Capacity: - 1300 Mgw.
Power output: - 4430 GWh.
Reservoir storage: - 676/1110 mln/m3.
Rated water discharge: - 450 m3/per sec.
Discharge through waterways - 2500 m3/per sec.
Rated head: - 325 m.
Type of regulation: - Seasonal
SCOPE OF WORKS:  
Excavation:
- 4363 ths./m3.
Filling, drainages and filters: - 960 ths./m3.
Contact grouting: - 1214 ths./m3.
Grouting of foundation: - 1199 ths./m2.
Curtain grouting: - 34 ths./m2.
Concrete and reinforced concrete: - 4083 ths./m3.
Installation of structural metal elements and mechanisms - 56 ths/T.

 

 

Schematic plan and longitudinal sectional views of Enguri HPP. 


 1. Jvari water reservoir;
 2. arch dam; 
 3. low-level water intake; 
 4. presure diversion tunnel;
 5. water-conduit bridge over the Olori rv. 
 6. water-conduit bridge over the Eristskali rv. 
 7. equalizing reservoir; 
 8. underground power plant; 
 9. pressure-free discharge tunnel; 
 10. Gali water reservoir.

 

 

 

ARCH DAM of ENGURI HPP

Parametters:


Height: - 271.5 m.
Including Saddle: - 50 m.
Thickness at the crest: - 10 m.
Thikness at the contact with saddle: - 52 m.
Arch crest length: - 605 m.
Thrust block’s length: - 123 m.
Concrete: - grade 350.
GEOLOGICAL CONDITIONS: - Jointly rock-fissured limestones and dolomites of the Barremain geological tier.
SCOPE OF WORKS:  
Excavation:
- 3432 ths./m3.
Embankment, drainage and filters: - 6 ths./m3.
Concrete and reinforced concrete: - 3838 ths./m.
Contact grouting, and joint grouting: - 314 ths./m.
Curtain grouting: - 33 ths./m2.
Consolidation grouting: - 569 ths./m3.
Installation of structural metal elements and mechanisms: - 12 ths./T.

 

Layout of arch dam:


1. access gallery of emergency gate house;
2. diversion tunnel;
3. emergency gate house;
4. water intake; 
5. construction tunnel. 

 

 

Cross-sectional view of arch dam:


 1. Leaf gate piers; 
 2.I stage starting elevation; 
 3. permanent water-discharging ports; 
 4. perimeter joint; 
 5. bottom port openings of the construction stage. 

 

 

PRESSURE DIVERSION TUNNEL OF ENGURI HPP.


Parametters:

Length: - 15050 m.
Including Water-conduit bridge over Olori Riv: - 210 m.
Including Water-conduit bridge over Eristskali Riv: - 91 m.
Inside diameter: - 9.5 m.
Maximal discharge capacity: - 450 m3/s.
Pressure tt the beginning: - 110 Bar.
Pressure tt the end:  - 175 Bar.
Maximal deeping: - 640 m.
GEOLOGICAL CONDITIONS:  
Initial interval 0,5 km – thin-layer: - Barrem limestones.
Next interval 1,5 km – thin-and midlayered: - limestones of Turon-Senon.
Thereafter: - Clay limestones of Mastricht-Data
SCOPE OF WORKS:  
Tunnel excavation:
- 1700 ths/m3.
Concrete and reinforced concrete lining: - 490 ths/m3.
Contact grouting: - 452 ths/m2
Consolidation grouting: - 576 ths/m3.
Installation of structural metal elements and mechanisms: - 9 ths/T.

 

 

Cross-sectional view of tonnel:


1 - Steel cladding;
2 - Lining concrete;
3 - Stiffener;
4 - Collector pipe Æ 130 mm;
5 - Drill hole;
6 - Cap;
7 - Lining the first stage.

 

 

 

UNDERGROUND POWER HOUSE OF ENGURI HPP


Parametters:

Length: - 127 m.
Width: - 22 m.
Height: - 51 m.
Maximum depth of occurrence: - 100 m.
GEOLOGICAL CONDITIONS: - Upper calcareous limestones of multiple block structure.
SCOPE OF WORKS:  
Rock excavation:
- 685 ths/m3.
Concrete and reinforced concrete lining: - 277 ths/m3.
Contact grouting and joint grouting: - 331 ths/m2.
Consolidation grouting: - 73 ths/m3.
Installation of steel structures and hydromechanical equipment: - 45 ths/T.

 

Section-through Center Line of Inguri Generating Unit.


 

 

FREE FLOW TRAILRACE TUNNEL OF ENGURI HPP


Parametters:

Length: - 3150 m.
Section: - 10.8x13.2 m2.
Maximum discharge capacity: - 450 m3/s.
Maximum depth of occurrence: - 250 m.
   
GEOLOGICAL CONDITIONS:   
Fissured and highly fissured marles chalk calcareous limestones of Mastricht-Data (2200m), marle clays, 
marle thick layered limestones of Mastricht-Data (950m)
   
SCOPE OF WORKS:  
Rock excavation: - 551 ths/m3.
Concrete and reinforced concrete lining: - 139 ths/m3.
Contact and joint grouting: - 77 ths/m2

 


   

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