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ILC UG UCA.ppt-1
Underground UnitUnderground Unit
Cost AnalysisCost Analysis
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U/G Unit Cost Analysis
Objective:
Prepare unit construction costestimates for the
undergroundstructures and their supportingconstruction facilities
for theconventional facilities
associated with the proposedInternational Linear Collider(ILC)
sited in a northeasternIllinois region near Fermilab.
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U/G Unit Cost Analysis
Methodology
Development of the Geotechnical Basis
Review and analyze the available geotechnical data
fromunderground construction projects executed within the
samegeneral vicinity and in similar subsurface conditions.
Based on the above review, establish the geotechnical basis
for
preparing unit cost estimates, such as: Production Rates
Tunnel Boring Machine (TBM)
Drill & Blast
Groundwater Inflow Rates
Temporary & Permanent Support Requirements
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Methodology (Contd)
Development of the Unit Costs Analyses
Subdivide the ILC U/G facilities into generic
constructiongroupings and then further subdivide the groupings into
similarelements for analysis.
Bound each element so that a representative cost can
beascertained.
Analyze the defined construction elements as to
theirconstruction costs and then convert those costs into a unit
cost.
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U/G Unit Cost Analysis
Methodology (Contd)
Develop the Summary of Costs Report,providing unit cost
estimates for the following generic constructiongroupings:
Tunnels
Shafts Caverns and/or Halls
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U/G Unit Cost Analysis
Results
Tunnels
The representative segments selected for analysis was basedon
the length of tunnel that could be bored in one work week(275 to
380 m). Tunnel diameters shown are nominal internal orfinished
diameters.
Cost estimates were crew based and included an allowance
forshotcrete lining, waterproofing, tunnel boring machine
(TBM)setup, mine rescue, and various other required
supportelements.
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U/G Unit Cost Analysis
Results
TunnelsILC RDR U/G Costs Analysis
Tunnel Construction Costs (TBM)9,000
Cons
truc
tion
Cos
t(
$/m) 8,000
7,000
6,000
5,000
4,000
400
375
350
325
300
250
275
TBM
Advance
Ra
te(m
/wee
k)
3 4 5 6 7 8 9
Nominal Tunnel Diameter (m)
TBM Advance Rate
TunnelConstruction
Costs
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U/G Unit Cost Analysis
Results
Shafts
A representative shaft segment could not be defined assubsurface
conditions vary as the shaft progresses down.Therefore each shaft
was analyzed for its full depth, whichranged from 90 to 140 m.
Diameters shown are nominal internal or finished diameters.
Overburden varied from 31 to 40 m based on the site
beinganalyzed.
Estimates were crew based and included an allowance
forreinforced concrete lining in access shafts and various
otherrequired support elements.
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U/G Unit Cost Analysis
Results
Shafts
0.80
1.07
9.0
14.015.0
Diameter(m)
5,870
7,780
250EachSurvey Boring
530EachVent Shaft
4,380EachAccess Shaft
7,740EachAccess Shaft5,700EachAccess Shaft
Unit Cost ($K)UnitDescription
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Results
Caverns and Halls
In most cases, a representative portion of a cavern/hall could
notbe defined because of large variances in their sizes.
Thereforeeach cavern was analyzed in total. (The exception to this
was thepassageways where only a single unit was analyzed.)
Caverns were excavated using drill and blast techniques.
Estimates were crew based and included an allowance for
rockbolts and fiber-reinforced shotcrete on top half of cavern
andincluded various other required support elements.
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U/G Unit Cost Analysis
Results
CavernsandHalls
Cons
truc
tion
Cos
tperm
3
ofExcava
tion
($)
00
Total Excavation (m3)
500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000
200
400
600
800
1,000
1,200
1,400
1,600
Access Passage (No. 29)
Cyro Rack Alcove (No. 39)Utility and Personnel Passage (No.
37)
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Questions
