Parsons - 2010 Construction Management for AWV.pdf - SCATnow

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Bored Tunnel Alternative Design-Build ProjectDesign-Build Construction Management Services SR 99proper equipment and trained personnel to perform hyperbaric interventions and repairs. Once again, the large pressuredifferential that exists between the top and bottom of the TBM created by the large diameter can be problematic whenworking on the lower portion of the TBM. Extensive ground stabilization and/or submerged diving work may be required.As discussed above, our team has managed the risks associated with hyperbaric interventions on similar projects. TableE.3 provides representative examples of our methodology, acting as CM support to WSDOT, to manage these and similarproject risks.Table E.3 Risk CM Role Design and Pre-construction CM Role - ConstructionWorker Safety• Exposure to working underhyperbaric interventions increaseshealth risksFace Stability• Loss of face stability can trapworkers; improper refilling ofplenum can cause settlementThe CM team must confirm that the designbuilder:• Provides a TBM with a robust design to reduceinterventions• Designs the TBM with proper hyperbaric equipment• Develops hyperbaric work plansThe CM team must confirm that the designbuilder:• Designs the TBM with a bentonite reserve availableto fill up the chamber and refilling prior to restartof the machineThe CM team must confirm that the design-builder:• Maintains trained hyperbaric medical and support staff• Ensures medical treatment facilities are in place• Hires experienced workers/divers and provides extensive training• Monitors worker healthThe CM team must confirm that the design-builder:• Maintains an available bentonite reserve and refills the chamber prior torestart of the machine• Provides the capability to perform grouting ahead and around the face toprovide additional face support4TBM Instrumentation and Performance AnalysisBenefits to WSDOT• Field-tested staff and data collection systems shorten thelearning curve – Ready Day 1• TBM experts know what the data means• Data systems easily integrate with inspection andgeotechnical data to obtain an integrated pictureParsons’ staff has developedsystems to collect and use TBMdata as a risk-reduction andproblem-solving tool on complexTBM projects, including theArrowhead Tunnels in Hemet, CA,and the Portland CSO Program.The Parsons team has the experience needed to determine, specify, and develop data management systems to monitorTBM operations. Our data systems allow the marrying of TBM data, inspector observations, and ground performance datato provide a complete picture. Shimi Tzobery will develop specific data programs for the TBM and inspection monitoring.He has developed TBM data analysis systems for complex, TBM operations, including the NYC East Side Access, theArrowhead Tunnels, and the Lake Mead Tunnel Projects. Shimi and Greg Colzani have developed PDA-based tunnelinspection systems to merge with TBM data. Jan Babendererde is well-versed in the value of TBM monitoring, as he wastasked to monitor the operation of slurry TBMs for the Willamette River CSO Program to evaluate and optimize operatorskills, monitor machine functions to develop maintenance schedules, and troubleshoot TBM functional issues.Assessing the risksKey Risks• Excessive TBM wear from improperly operated TBM• Ground loss from poor face pressure management, overexcavation, poor steering, inadequate soil conditioning, orinsufficient backfill groutingThe design-builder will provide TBM operation monitoring data as partof the SR 99 Design-Build project. Even the best designed TBMs will notserve their intended purpose if not operated properly. If unchecked, theTBM can exhibit crippling wear, alignment issues, and excessive groundsettlement to name a few. TBM data, if processed and analyzed diligently,38
Bored Tunnel Alternative Design-Build ProjectDesign-Build Construction Management Services SR 99can be a key tool for optimizing performance and reducing risks. For example, on the Arrowhead Tunnels project, Shimiprovided detailed analysis of thrust, cutterhead rotation speed, and the penetration rate from TBM data to optimizeperformance and reduce wear resulting in a key claim defense. As the CMconsultant, we will use our expertise in this field to ensure that sufficient andaccurate system records are collected, inspection data is recorded, and a highlevel of TBM and geotechnical analysis is performed. The tunnel data managementsystem will use TBM data output to develop operational profiles to correlate withsettlement monitoring systems. Comparison and interpretation of data fromthese sources will be essential to maintaining optimum tunnel performance withrespect to production and control of settlement. Table E.4 provides representativeexamples of our methodology, acting as CM support to WSDOT, to manage theseand similar project risks.Table E.4 Risk CM Role - Design and Pre-construction CM Role - ConstructionTBM Wear• Failure of critical TBM components• Excessive wear of componentsGround loss• Loss of ground in the face, overmining, improper steering, andimproper or inadequate backfillgrouting of the annular spaceThe CM team must confirm that thedesign-builder:• Provides a robust design• Provides baseline operational parameters forall TBM functions• Provides the ability to monitor all critical TBMfunctionsThe CM team must confirm that thedesign-builder:• Properly designs the TBM• Provides adequate TBM operational andmonitoring work plansThe CM team must confirm that the design-builder:• Develops and implements an aggressive preventative maintenance program• Monitors and analyzes all TBM functions (torque, rotation, pressure balance,wear detectors, temperature, and current consumption to look for trends andanomalies not normally anticipatedThe CM team must confirm that the design-builder:• Monitors the TBM advance rate, discharge rate, volume, face/plenum pressure,and grouting volume• Analyzes that data for each shove correlates with settlement data• Conducts daily TBM performance and ground performance meetings; takesremedial or corrective actions, as necessary5Geotechnical Instrumentation for Monitoring Protection of Existing StructuresBenefits to WSDOT• Project staff has thorough project-specific knowledge ofgeotechnical conditions• Conducted extensive ground behavior and structure analysisfor the entire SR 99 alignment• Nationally recognized tunnel behavior experts• Experts in local geologyOur team has modeled the predicted soilbehavior, and inspected and analyzed 157structures along the alignment. Our staffhas monitored structures for numeroustunnel projects including the Dulles AirportConnector, the Los Angeles Metro Rail Lineand WMATA.To help WSDOT manage the risks associated with ground performance monitoring and instrumentation optimization, theParsons team has included Tony Stirbys and Dr. Ed Cording to supplement our tunnel CM experts. Tony is well-versed inthe local geology and was instrumental in the development of geotechnical analysis, instrumentation, and buildingprotection plans for the SR 99 tunnel alignment.He performed instrumentation design andmonitoring, and implemented grouting protectionand remedial action plans for urban tunnelOur team conducted an in-depth study of the soil conditionsand analyzed all of the structures along the alignment thatcould be impacted by TBM-induced ground settlement.39
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Additional Staff ResumesTab 1 Addit
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