Xiaolangdi - · PDF file- Hydropower Generation ... Grouting below the upstream cofferdam ......

SOLETANCHEBACHY DAMSPage 1

XIAOLANGDIXIAOLANGDI DAMDAM

CHINAXIAOLANGDI DAM

General Presentation

New StructureNew Structure

LOCATION : CHINA - Henan Province

New StructureNew Structure CHINAXIAOLANGDI DAM

General PresentationINTRODUCTION :

- Yellow River and Hydroelectric Power Development Corporation = Responsible

- Canadian International Project Managers = Consultant

- Financed by World Bank

- 3 lots :Lot 1 : Main Dam and its foudations ( Impregilo, Hochtief, Bureau 14 )Lot 2 : Intake, spillway and diversion structures (Züblin/Spie/Bureaux7,11)Lot 3 = Power facilities ( Dumez/Holtzman/Bureau6 )

General PresentationPROJECT FUNCTIONS :

- Hydropower Generation

- Flood protection for Yellow River basin

- Reduction of loess deposit

- Supply of irrigation

General PresentationPROJECT FEATURES :

- 154 m high zoned earth and rockfill damwith a crest length of 1700m

- Tunnels for river diversion and floodcontrol and erection of the intake and outlet structures (including a plunge pool and stilling basin )

- Construction of the underground powerstation with associated tunnels

Power House

Free flow tailrace tunnels

DS Cofferdam

Intake structure

Free flow orifice and sediment tunnels

Power tunnels

INTAKE STRUCTURE :

L = 281m / Th = 60m / H = 108m16 tunnels :

- 3 diversion tunnels- 3 sediment tunnels- 3 x 2 Power tunnels- 3 Free flow tunnels- 1 irrigation tunnel

General PresentationMAIN DAM :

General PresentationFOUNDATION WORKS :

- Curtain Grouting Right Bank- Curtain Grouting Left Bank ( scaffolding - slope of 50° )- Diaphragm wall in the riverbed ( 70m deep )- Consolidation grouting below the dam- Curtain Jet - Grouting below the upstream cofferdam ( 10 500 m2 )

Grouting :120 000 lm of grouting holesDownstage MethodFault ZoneStable Mix ( W / c = 0.67 )

Drilling for Instrumentation :Critical pathInclinometers, piezometers,standpipes

China-Xiao Lang Di Dam–Concrete wall, Jet - grouting, Grouting,Instrumentation

New StructureNew Structure

General PresentationContact with the rock

General PresentationJoints

General Presentation« Chinese » Joints

- Upstream Cofferdam- Left Bank sand pocket- Tiger MouthRepairing of the panel N°1

Jet - Grouting : - difficult ground conditions- Specs of 0.5% of deviation

Xiaolangdi - · PDF file- Hydropower Generation ... Grouting below the upstream cofferdam ......

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