perspectives on foundation engggineering for … stgec...photo from the star-tribune some key...
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Perspectives on Perspectives on Perspectives on Perspectives on Perspectives on Perspectives on
Foundation Engineering Foundation Engineering
Perspectives on Perspectives on
Foundation Engineering Foundation Engineering g gg g
for Designfor Design--Build ProjectsBuild Projects
g gg g
for Designfor Design--Build ProjectsBuild Projectsgg jjgg jj
Dan Brown, P.E., Ph.D.Dan Brown and Associates
Dan Brown, P.E., Ph.D.Dan Brown and Associates
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Considerations with DesignConsiderations with Design--BuildBuild
S h d lSchedule
Competitive Price / Best Value
Risk Profile
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Considerations with DesignConsiderations with Design--BuildBuild
S h d lScheduleD-B is a very effective method to accelerate project deliveryFoundations typically critical path itemyp y pUncertainties regarding submittal / acceptance hold point items presentacceptance hold point items present schedule risk
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Considerations with DesignConsiderations with Design--BuildBuild
Ri k P filRisk ProfileResponsible bidders price the riskp pBetter geotechnical information reduces riskreduces riskSome risks are best retained by owner
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Considerations with DesignConsiderations with Design--BuildBuild
C titi P i / B t V lCompetitive Price / Best ValueIn the absence of best value selection criteria, low price always winsOne can only bid to meet the statedOne can only bid to meet the stated criteria; the rules must be clearV l it t b l l dValue items must be clearly conveyedPerformance criteria
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Example: Honolulu Rail TransitExample: Honolulu Rail Transit
G t h i l B li R tGeotechnical Baseline ReportWide range of varying ground g y g gconditions
Extensive Performance TestingExtensive Performance Testing Requirement
Allowed innovation
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Honolulu Rail ProjectHonolulu Rail Project
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Oahu Oahu -- GeologyGeology
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WOFH Ground ConditionsWOFH Ground Conditions
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14 Load Tests on 11 miles of Guideway14 Load Tests on 11 miles of Guideway
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Base Grouting in Sand/Gravel/CobblesBase Grouting in Sand/Gravel/Cobbles
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Example: Honolulu Rail TransitExample: Honolulu Rail Transit
G t h i l B li R tGeotechnical Baseline ReportHelped define risks, minimize pcontingency costs
Extensive Performance TestingExtensive Performance Testing Requirement
Allowed innovation
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Example: Hastings Bridge, MNExample: Hastings Bridge, MN
B t V l S l ti PBest Value Selection ProcessPrice / Technical Score
Verification of High Capacity Pipe PilesN th Ab t t S ttl t INorth Abutment Settlement Issue
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Hastings, MN Steel Pipe PilesHastings, MN Steel Pipe Piles
42” dia x 1” x 150’PDA used to monitor driving stress so pile g pcan be driven hardStatnamic axial forStatnamic axial for verification
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Hastings, MN Steel Pipe PilesHastings, MN Steel Pipe Piles
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Hastings Steel Pipe Pile TestingHastings Steel Pipe Pile Testing
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Hastings BridgeHastings Bridge
F th RFPFrom the RFP:
4.3.3.5.3 Geotechnical (5 Points)4.3.3.5.3 Geotechnical (5 Points)The Proposal shall include a narrative describing the Proposer’s approach to managing long-term settlement on the North Approach Segment. Mn/DOT will evaluate the following subfactors:Segment. Mn/DOT will evaluate the following subfactors:
Adequacy of design to minimize long-term settlement on the North Approach SegmentAdequacy of construction validation of settlement criteria to minimizeAdequacy of construction validation of settlement criteria to minimize long-term settlement on the North Approach Segment
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Pile Supported EmbankmentPile Supported Embankment
Pile raft thru soft clay at North Embankment
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Pile Supported EmbankmentPile Supported Embankment
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Hastings BridgeHastings Bridge
Photo from the Star-Tribune
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Some Key Conclusions of NCHRP 429Some Key Conclusions of NCHRP 429
Q lifi ti & E i f DBQualifications & Experience of DB Geotechnical Team is key to qualityGeotech reviews affect schedule; use over-the-shoulder reviews to expedite scheduleWeight geotechnical factors appropriately to the importance to project successp p jUse ATC’s to allow bidders to reduce risk
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Some Key Conclusions of NCHRP 429Some Key Conclusions of NCHRP 429
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SummarySummary
G t h i l i b iti l tGeotechnical issues can be critical to success of Design-Build projects;
Schedule-costs-risksRFP should reflect value of geotechnical aspectsManage risks with quality prebid geotech g q y p gdata, GBR, DSC clauses
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SummarySummary
A i d fAgencies can encourage good performance with:
High value on geotech qual’sClear performance requirements, QAATC’s