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Page 1: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Tunneling for Lake Taps

Page 2: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Agenda

1. Basic Tunneling

– Soft Ground Tunneling

– Hard Rock Tunneling

– Machine Selection

2. Shafts

3. Lake Taps

– Dry Tap

– Wet Tap

Page 3: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Soft Ground Tunneling

– Hand Mining

– Sequential Excavation Mining

– Shields

– Earth Pressure Balance

– Slurry

Page 4: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Hard Rock Tunneling

– Tunnel Boring Machines

– Road Header

– Drill & Blast

Page 5: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Initial Support

• Ribs & Boards

• Liner plates

• Rock Bolts & Mesh

• Shotcrete

• Jacked pipe

Page 6: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Tunneling Machine Selection

Page 7: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Earth Pressure Balance (EPB) Machine

Page 8: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

EPB Machine

Page 9: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Soft Ground Tunneling Slurry Shield with Drag Cutters

Page 10: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Soft Ground Tunneling Slurry Circulation /

Separation Equipment System

Page 11: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Soft Ground Tunneling

Slurry Separation Equipment

Page 12: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Shaft Excavation

• Excavator

• Drill & Blast

• Blind Drills

Page 13: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Shaft drilling

Page 14: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Shaft Reamer

Page 15: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Support

• Ribs & boards

• Liner plates

• Shotcrete, mesh & bolts

• Segments

• Other

Page 16: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Lake Taps

• Dry Tap

• Wet Tap

Page 17: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Dry Tap

Page 18: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Excavation for work slab

Page 19: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Concrete Slab Construction

Page 20: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Ground Improvement

Page 21: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Secant Pile Construction

Page 22: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Drill shaft

Page 23: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Set Steel Liner

Page 24: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Grout Steel Liner

Page 25: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Tunnel Arrival

Page 26: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Connection to Tunnel

Page 27: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Connection to Tunnel (cont.)

Page 28: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Placing elbow in Tunnel

Page 29: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Setting of Intake

Page 30: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Setting of Intake (cont.)

Page 31: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Wet Tap

• Norwegian Tap

• Microtunnel

Page 32: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Norwegian Tap

•Tunnel to a rock plug

•Construct Rock trap

•Prepare tunnel for water

•Blast rock plug

Page 33: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Microtunnel Tap

• Microtunnel Operation - No shaft In Lake

Page 34: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Typical Microtunnel Operation

• Remotely controlled

pipe jacking process

•Non-person entry

•Pressurized closed face

TBM (Slurry or EPB)

•Active direction control

•Auger vs. slurry spoil

transport

•Diameters: 1 to 10 ft

•Drive span: 30 to 200 m,

typical

Page 35: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Slurry Separation

Page 36: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Microtunnel to 8 to10 ft. of Breakout

Page 37: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Microtunnel to slope edge

Page 38: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Bulkhead in Rear of MTBM

Page 39: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Microtunnel Breakout

Page 40: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Microtunnel Head Removal Preparation

Page 41: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Microtunnel Head Removal

Page 42: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Final Positioning of Casing

Page 43: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

Place Elbow & Trash Rack

Page 44: Tunneling for Lake Taps - Tunneling Short Course · BRIERLEY ASSOCIATES Agenda 1. Basic Tunneling – Soft Ground Tunneling – Hard Rock Tunneling – Machine Selection 2. Shafts

BRIERLEY ASSOCIATES

“Creating Space

Underground”


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