SR99 Bored Tunnel-Assessment of Settlement Impacts ... - SCATnow

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6.5 Building Cladding ................................................................................................................... 276.6 Summary of Building Damage Prediction along Tunnel Alignment .............................. 287.0 REFERENCES .................................................................................................................................. 41Appendix AAppendix BAppendix CAppendix DAppendix ETunnel Alignment Plan Sheets with Identified BuildingsBuilding Damage Classification and Distortion TerminologyBuilding Assessment Forms, Drawings, and PhotographsBoscardin and Cording Analysis ToolMonitoringList of TablesTable 1. Buildings with Anticipated Damage of Moderate and Above .................................................... 2Table 2. Building Damage Classification ..................................................................................................... 21Table 3. Breakdown of Anticipated Building Damage .............................................................................. 25Table 4. Summary of Building Damage Prediction along the Tunnel .................................................... 29List of FiguresFigure 1. AWV Program Elements. .............................................................................................................. 6Figure 2. Proposed Bored Tunnel Cross-Section. ........................................................................................ 8Figure 3. Generalized Transverse Settlement Trough .............................................................................. 17Figure 4. Relationship of Building Damage to Angular Distortion and Horizontal Strain (fromBoscardin and Cording [1989]) ........................................................................................................ 19Figure 5. Development of Surface Settlement Trough (Attewell, Yeates, and Selby [1986]) .............. 23The Alaskan Way Viaduct & Seawall Replacement Program March 2010Proposed SR 99 Bored Tunnel - Assessment of Settlement Impacts to BuildingsiiiPublic Disclosure Request 11-0123 for Elizabeth Campbell - 2nd installment
Proposed SR 99 Bored Tunnel -Assessment of Settlement Impacts toBuildings1.0 Executive SummaryAn initial assessment of impacts to the buildings along the SR 99 roadway alignmentdue to the construction of the proposed bored tunnel alternative is presented in thisreport. Tunneling is expected to result in settlements of varying magnitude, whichdepend on many factors. The evaluation process started with an assessment of theexisting condition of buildings along the alignment, followed by an analysis topredict settlement associated with tunneling. The amount of settlement assumed inthe analysis is a baseline from which refinements or mitigations can be measured.Settlement corresponding to 0.5% of the tunnel cross sectional area (termed “lostground”) was assumed. This amount of settlement is not fixed or final, but areasonable assumption on which to initiate the assessments. On the basis of thepredicted settlement, an analysis was performed to predict building damage. For thebuildings with the greatest potential damage, further structural engineering analysisand evaluations were performed. Finally, a qualitative evaluation of the potentialimpacts to the buildings was made by structural engineers knowledgeable in the typeof structures encountered along the tunnel alignment. The unmitigated buildingimpacts are expressed as the damage that may take place. Damage is quantified bythe nature of the anticipated repairs that may be required. This assessment of thepotential unmitigated settlement impact for each building will be followed by furtherstudies of alternatives and mitigations, when appropriate, as the documents forconstruction are prepared.The south portal construction for the proposed SR 99 Bored Tunnel Alternativeproject will extend north from Royal Brougham Way along Alaskan Way with theheadwall for the bored tunnel occurring just south of South King Street. Passingunder Alaskan Way and the existing viaduct, the tunnel would then traverse a largeradius curve beginning just south of South Washington Street, pass under WesternAvenue and continue diagonally under Seattle’s central business district to FirstAvenue. Near Stewart Street, the alignment would traverse a large radius curve tothe north, extending beyond and diagonal to the street grid of Seattle’s Belltownneighborhood. The tunnel would then travel under Denny Way into the SixthAvenue North right-of-way and transition to a cut-and-cover section north ofThomas Street.Buildings along the alignment range from single-story unreinforced masonrybuildings with wood framed roof structures to multi-story residential and officeThe Alaskan Way Viaduct & Seawall Replacement Program March 2010Proposed SR 99 Bored Tunnel - Assessment of Settlement Impacts to Buildings 1Public Disclosure Request 11-0123 for Elizabeth Campbell - 2nd installment
Page 5: Table of Contents1.0 EXECUTIVE SUMM
Page 9 and 10: The damage classification for the r
Page 11 and 12: 2.0 Program Description & Backgroun
Page 13 and 14: 2.2 Tunnel Project DescriptionThe T
Page 15 and 16: 2.2.3 North Access Project Descript
Page 17 and 18: 3.0 Building AssessmentThe tunnel a
Page 19 and 20: . History of settlement - based upo
Page 21 and 22: 4.0 Settlement and Ground Movement4
Page 23 and 24: Figure 3. Generalized Transverse Se
Page 25 and 26: 5.0 Building Response to Excavation
Page 27 and 28: Table 2. Building Damage Classifica
Page 29 and 30: tunnel axis), the settlement trough
Page 31 and 32: 6.0 Results of Structural Analyses6
Page 33 and 34: Therefore, high-rise buildings alon
Page 35 and 36: Table 4. Summary of Building Damage
Page 37 and 38: PROPERTY IDPROPERTY ADDRESSAPPROXIM
Page 47 and 48: 7.0 ReferencesAttewell, P.B.; Yeate
Page 49 and 50: Appendix ATunnel Alignment Plan She
Page 51 and 52: A1Legend! ! SeawallPiersAreawaysTun
Page 53 and 54: T161NOTES :1) ASSESSMENT OF DAMAGE
Page 55 and 56: A3LegendMONORAILEBIAreawaysTunnelTu
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Appendix BBuilding Damage Classific
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Figure B-1. Graphical Illustration
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Appendix CBuilding Assessment Forms
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List of Abbreviations Used in Build
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Distance to Tunnel:• Horizontal o
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example, T311 and T312 are the same
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Appendix DBoscardin and Cording Ana
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Table of Contents1.0 B&C ANALYSIS M
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1.0 B&C Analysis MethodThe building
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Offset, Yδε hLβDeparture from tu
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Figure D-1. Building Location Coord
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1.00.90.80.7G((X-XT)/KZ)0.60.50.40.
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2.0 B&C Damage ClassificationsTable
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3.0 E/G RatioE/G is based upon Tabl
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4.0 Building HeightBuilding height
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5.0 Foundation DepthThe analysis to
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Appendix EMonitoringThe Alaskan Way
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Table of Contents1.0 INTRODUCTION .
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1.0 IntroductionThe potential groun
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2.0 Basic MonitoringManual survey p
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3.0 Tilt Meter Monitoring3.1 Goals3
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4.0 GPS Monitoring4.1 Goals4.2 Impl
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5.0 Automated Monitoring Total Stat
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6.0 Distributed Data Acquisition6.1
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The emerging capability of wireless
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7.0 Levels of MonitoringEach buildi
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