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

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The shape of the transverse settlement trough can be described by a GaussianProbability distribution curve as shown Figure 3. The settlements are approximatedby a Gaussian probability distribution curve in the direction perpendicular to thetunnel axis. It can be seen that the trough has its maximum slope at the point ofinflection, which is located at the distance i from the tunnel centerline. This pointseparates the sagging zone from the hogging zone.The shape of the Gaussian Probability distribution curve is a function of the distancefrom tunnel centerline to the inflection point. As the distance to the point ofinflection increases, the curve is generally wider and flatter and as the distancedecreases, the curve is generally narrower and taller. Case history data presented inMair and Taylor (1997) indicates the distance to the point of inflection (i) can berelated to tunnel depth (Z o ), where:iK = (Eq. 1)ZShannon & Wilson indicate that the K values utilized vary along the length of thetunnel alignment. The following values were utilized are as follows:K = 0.35 between Stations 200+00 to 217+00K = 0.50 between Stations 217+00 to 281+00K = 0.35 between Stations 281+00 to EndThe settlement, S z , at a point of interest is a function of the horizontal distance fromthe tunnel centerline, x; and the vertical distance above the tunnel springline, z. Forsurface settlements, the vertical distance z is equal to the depth to the tunnelspringline, Z.The Alaskan Way Viaduct & Seawall Replacement Program March 2010Proposed SR 99 Bored Tunnel - Assessment of Settlement Impacts to Buildings 16Public Disclosure Request 11-0123 for Elizabeth Campbell - 2nd installment
Figure 3. Generalized Transverse Settlement TroughIt should be noted that the settlement profile generated utilizing this method doesnot consider the potential impact of a sloping ground surface on the shape andmagnitude of the settlements, such as occurs at many of the building sites betweenMadison and Stewart Streets. Once the anticipated settlement was determined foreach building, the settlement was then utilized to estimate the horizontaldisplacements, and in turn the horizontal strain, utilizing the formula below:εh2= δ ( y)⎛ y ⎞⎜ −⎟12∗1 2z ⎝ 2i⎠(Eq. 2)where:δ(y) = settlement at a distance y from tunnel centerline (inches)z = depth from ground surface (or bottom of foundation where the buildingdisplacement is of interest) to midpoint of tunnel (feet)y = horizontal distance from centerline to point of interest (feet)i = distance from centerline to point of inflection (feet)The Alaskan Way Viaduct & Seawall Replacement Program March 2010Proposed SR 99 Bored Tunnel - Assessment of Settlement Impacts to Buildings 17Public 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 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: 4.0 Settlement and Ground Movement4
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
Page 65 and 66: Distance to Tunnel:• Horizontal o
Page 67 and 68: example, T311 and T312 are the same
Page 69 and 70: Appendix DBoscardin and Cording Ana
Page 71 and 72: Table of Contents1.0 B&C ANALYSIS M
Page 73 and 74:
1.0 B&C Analysis MethodThe building
Page 75 and 76:
Offset, Yδε hLβDeparture from tu
Page 77 and 78:
Figure D-1. Building Location Coord
Page 79 and 80:
1.00.90.80.7G((X-XT)/KZ)0.60.50.40.
Page 81 and 82:
2.0 B&C Damage ClassificationsTable
Page 83 and 84:
3.0 E/G RatioE/G is based upon Tabl
Page 85 and 86:
4.0 Building HeightBuilding height
Page 87 and 88:
5.0 Foundation DepthThe analysis to
Page 89 and 90:
Appendix EMonitoringThe Alaskan Way
Page 91 and 92:
Table of Contents1.0 INTRODUCTION .
Page 93 and 94:
1.0 IntroductionThe potential groun
Page 95 and 96:
2.0 Basic MonitoringManual survey p
Page 97 and 98:
3.0 Tilt Meter Monitoring3.1 Goals3
Page 99 and 100:
4.0 GPS Monitoring4.1 Goals4.2 Impl
Page 101 and 102:
5.0 Automated Monitoring Total Stat
Page 103 and 104:
6.0 Distributed Data Acquisition6.1
Page 105 and 106:
The emerging capability of wireless
Page 107 and 108:
7.0 Levels of MonitoringEach buildi
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