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

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Figure 1. AWV Program Elements.The Alaskan Way Viaduct & Seawall Replacement Program March 2010Proposed SR 99 Bored Tunnel - Assessment of Settlement Impacts to Buildings 6Public Disclosure Request 11-0123 for Elizabeth Campbell - 2nd installment
2.2 Tunnel Project DescriptionThe Tunnel Project is a part of the Alaskan Way Viaduct (AWV) Program (illustratedin Figure 1) and contains three major components: the South Access Project; theDesign Build Tunnel Project; and the North Access Project.2.2.1 South Access Project DescriptionThe South Access Project would provide access to the tunnel at a portal near Qwestand Safeco Fields. The south portal area would be located on Alaskan Way, betweenS. Royal Brougham Way and S. Dearborn Street, and would consist of an at-grademainline roadway and ramps leading to a depressed mainline and ramp roadwaysadjacent to the mainline tunnel and ramp portals. In addition, at least one newsurface cross street would provide a connection between SR 99, Alaskan Way, andFirst Avenue S.2.2.2 Design Build Tunnel Project DescriptionThe Design Build Tunnel Project would begin between S. Royal Brougham Way andCharles Street with a depressed roadway section that contains the mainline andsouthbound off-ramps and northbound on-ramps. The portals for the ramps andmainline would be in the vicinity of Charles Street. They would lead into the cutand-coverportion of the tunnel that extends approximately 1,000 feet and transitionsfrom a side-by-side roadway to a stacked configuration at a bored tunnel that wouldbegin immediately south of S. King Street under Alaskan Way. The roadwaystructure inside the bored tunnel would stack the roadways with two southboundlanes on the upper level and two northbound lanes on the lower level. At thislocation, the base of the cut–and-cover tunnel would be approximately 90 feet belowthe ground surface, and the top of the tunnel would be about 30 feet below theground surface. A southern tunnel operations building located east of SR 99between S. Dearborn Street and S. King Street would provide ventilation as well asmaintenance and operation capabilities. The lowest level of the building would beabout 75 feet below the ground surface.There would be approximately 8,800 feet of bored tunnel with an approximateoutside diameter of 54 feet. The bored tunnel would decline at a 4 percent grade andpass under Alaskan Way, cross under the existing viaduct, follow a large radius curvebeginning just south of S. Washington Street, then pass under Western Avenue to beparallel with First Avenue. The tunnel would reach a low point under MadisonStreet where the top of the tunnel would be about 120 feet below street level. Thetunnel would then rise at a 1.6 percent grade to the north as it continues under FirstAvenue to near Stewart Street, where it would follow a large radius curve to thenorth and cross under the street grid of Seattle’s Belltown neighborhood at adiagonal. The tunnel would reach a depth of 215 feet from the crown of the tunnelto the ground surface at Virginia Street. At Lenora Street, the tunnel transitions toapproximately a4 percent grade. The tunnel would transition back to a cut-and-The Alaskan Way Viaduct & Seawall Replacement Program March 2010Proposed SR 99 Bored Tunnel - Assessment of Settlement Impacts to Buildings 7Public Disclosure Request 11-0123 for Elizabeth Campbell - 2nd installment
Page 5 and 6: Table of Contents1.0 EXECUTIVE SUMM
Page 7 and 8: Proposed SR 99 Bored Tunnel -Assess
Page 9 and 10: The damage classification for the r
Page 11: 2.0 Program Description & Backgroun
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
Page 57 and 58: Appendix BBuilding Damage Classific
Page 59 and 60: Figure B-1. Graphical Illustration
Page 61 and 62: Appendix CBuilding Assessment Forms
Page 63 and 64:
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
Page 73 and 74:
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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