Location
Chalous Road
Stage
Structural works of the tunnel, regulating dam, and intake structure completed; tunnel section under provisional handover; dam and intake structure in equipment installation stage.
Technical Specifications:
• Tunnel gradient: 0.177%
• Excavation diameter: 4.665 m
• Finished diameter after lining: 3.90 m
• Excavation system: Full-face mechanized tunneling using Double Shield TBM with minimum turning radius of 300 m
• Design flow: 16 m³/s
• Ventilation system: Jet-fan with blowing operation
• Dewatering system: Gravity–pumping type
• Haulage and mucking system: Rail–crane type
Role of Moshanir
Consultant to the client for design and site supervision.
Special Achievements
• Selection of special pozzolanic cement to neutralize alkali–aggregate reaction in segment concrete.
• Adoption of intake structure downstream of the regulating dam instead of intake from the reservoir.
• Full-time supervision and management of TBM overhaul operations, leading to early completion of works.
• Placement of gaskets between segment joints to improve injection efficiency.
• Installation of piezometers and manometers in the tunnel for geotechnical monitoring.
• Development of reinforcement solutions for tunnel sections in fault zones.
• Successful crossing of the Pourkan–Vardij fault with specialized execution management.
