Appendix D TBM Tunnel Assumptions and Cost Estimating - VLHC

142 Pages·2001·9.17 MB·English

Appendix D
TBM Tunnel Assumptions and Cost Estimating Output
Appendix D TBM Tunnel Assumptions and Cost Estimating Output

Discussion:

The tunnel costs were estimated using TBM cost estimating software and cost database
developed by Hatch Mott MacDonald. Appendix D contains output from the software for each
TBM type and tunnel diameter. Please note the following about the output:
1. ‘Rock Types’ are called ‘TBM Types’ in the main body of the report.
2. ‘Rock Type A/B’ is called ‘TBM Type B’ in the main body of the report.
3. The costs for concrete inverts were not included in the output in the appendices.
These were added in the CNA cost estimating spreadsheet. The inverts are needed to
provide a flat working surface. Inverts were added to TBM Types A and C only because
it was assumed that the TBM Type B cast-in-place liner could be formed with a flat
bottom.
4. The costs of grouting for water control were not included in the appendices. These
were added in the CNA cost estimating spreadsheet. Grouting was added to TBM Types
A and B only. TBM Type C is a sealed system that does not allow water to enter the
tunnel so grouting is not required.

List of Abbreviations:

CIP Cast-in-place
H Hour
m2 Square meters of tunnel face
Nr Number (equivalent to ‘Each’)
W Week
mW per meter per week
kWh Kilowatt hour
l Liter
m Meter
m3 Cubic meter
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Fermilab Tunnels
Cost Estimates
Assumptions
General
The following assumptions apply to all tunnel drives:
• 4800 metres of tunnel from shaft to shaft
• 2 ten hours shifts undertaken daily, 5 days per week
• Tunnels excavated using 3.66 metre or 4.88 metre finished diameter rock TBM
• 75 percent of TBM cost written off in first drive, 15 percent in second drive, 10 percent in
third drive, and 0 percent in fourth and fifth drives
• Labour rates based on Minneapolis Project for Year 2001. (Similar to Illinois)
Specific
Assumptions used for 3.66m (12ft) diameter tunnel in Rock Type A as follows:
• No areas of difficult excavation
• A total of 400 3 metre long rockbolts installed sporadically in the tunnel crown in jointed
or potentially weak zones
• Average tunnel advance rate of 225 metres per week
• No secondary lining required
Assumptions used for 3.66m (12ft) diameter tunnel in Rock Type A/B (requiring CIP liner) as
follows:
• No areas of difficult excavation
• Three rockbolts, 3 metres in length, installed in each 6 metre length of tunnel
• Average tunnel advance rate of 211 metres per week
• Secondary cast-in-place concrete lining installed to prevent long term degradation of the
rock
Assumptions used for 3.66m (12ft) diameter tunnel in Rock Type C as follows:
• Areas of difficult excavation encountered, slowing normal advance rate by 20 percent,
over 20 percent of the tunnel length
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• No primary support provided with a 200mm thick segmental concrete lining installed
immediately behind the TBM following each excavation cycle
• Average tunnel advance rate of 102 metres per week
Assumptions used for 4.88m (16ft) diameter tunnel in Rock Type A as follows:
• No areas of difficult excavation
• A total of 400 3 metre long rockbolts installed sporadically in the tunnel crown in jointed
or potentially weak zones
• Average tunnel advance rate of 225 metres per week
• No secondary lining required
Assumptions used for 4.88m (16ft) diameter tunnel in Rock Type A/B (requiring CIP liner) as
follows:
• No areas of difficult excavation
• Three rockbolts, 3 metres in length, installed in each 4.5 metre length of tunnel
• Average tunnel advance rate of 195 metres per week
• Secondary cast-in-place concrete lining installed to prevent long term degradation of the
rock
Assumptions used for 4.88m (16ft) diameter tunnel in Rock Type C as follows:
• Areas of difficult excavation encountered, slowing normal advance rate by 20 percent,
over 20 percent of the tunnel length
• No primary support provided with a 225mm thick segmental concrete lining installed
immediately behind the TBM following each excavation cycle
• Average tunnel advance rate of 102 metres per week
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Fermilab Tunnels
Estimate Summary
12 ft dia tunnel (3.66 m)
Rock Type Tunnel Drive Tunnel Length Drive Cost TBM setup Total
(m)
A First 4800 8,160,000 400,000 8,560,000
A Second 4800 6,070,000 200,000 6,270,000
A Third 4800 5,910,000 200,000 6,110,000
A Fourth 4800 5,600,000 200,000 5,800,000
A Fifth 4800 5,600,000 200,000 5,800,000
A/B with CIP First 4800 18,930,000 400,000 19,330,000
A/B with CIP Second 4800 16,350,000 200,000 16,550,000
A/B with CIP Third 4800 16,140,000 200,000 16,340,000
A/B with CIP Fourth 4800 15,710,000 200,000 15,910,000
A/B with CIP Fifth 4800 15,710,000 200,000 15,910,000
C First 4800 26,630,000 400,000 27,030,000
C Second 4800 23,190,000 200,000 23,390,000
C Third 4800 22,940,000 200,000 23,140,000
C Fourth 4800 22,430,000 200,000 22,630,000
C Fifth 4800 22,430,000 200,000 22,630,000
16 ft dia tunnel (4.88 m)
Rock Type Tunnel Drive Tunnel Length Drive Cost TBM setup Total
(m)
A First 4800 10,930,000 400,000 11,330,000
A Second 4800 7,360,000 200,000 7,560,000
A Third 4800 7,080,000 200,000 7,280,000
A Fourth 4800 6,520,000 200,000 6,720,000
A Fifth 4800 6,520,000 200,000 6,720,000
A/B with CIP First 4800 24,410,000 400,000 24,810,000
A/B with CIP Second 4800 20,160,000 200,000 20,360,000
A/B with CIP Third 4800 19,810,000 200,000 20,010,000
A/B with CIP Fourth 4800 19,100,000 200,000 19,300,000
A/B with CIP Fifth 4800 19,100,000 200,000 19,300,000
C First 4800 33,360,000 400,000 33,760,000
C Second 4800 27,830,000 200,000 28,030,000
C Third 4800 27,400,000 200,000 27,600,000
C Fourth 4800 26,550,000 200,000 26,750,000
C Fifth 4800 26,550,000 200,000 26,750,000