The Nicoll Highway Collapse

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Observations on the morning of the collapse
M301 333 334 M302 M303 North wall M304 M305 4 2 3 1 6 7 335 336 337 338 339 340 H H H KP 181 KP 182 KP 183 1 5 5 5 7 7 M306 M307 M308 M309 M310 1 Order in which distortion to waler noted Excavation to 10 th complete Excavation in progress Location of walers, splays and Dwall gaps
Page 1 and 2: The Nicoll Highway Collapse D W Hi
Page 3 and 4: C825 34m Diameter Temporary Staging
Page 5 and 6: NORRTHING (m) ABH27 31700 31650 316
Page 7 and 8: Depth (m) Cone resistance, qc (MPa)
Page 9 and 10: Formation level approx 33m bgl Temp
Page 11 and 12: M3 M2 TSA Shaft Utility crossings N
Page 13 and 14: Two Struts Bearing Direct on Single
Page 15: Events Events and and observations
Page 18 and 19: C channel connection Strut bearing
Page 22 and 23: S335 S335-99 Strut 335-9 south wall
Page 25 and 26: Instrumentation and results of moni
Page 27 and 28: SG3358 Total Force SG3359 Total For
Page 29 and 30: Load Observed trends in 8 th and 9
Page 31 and 32: Deepth (m) 0 Horizontal displacemen
Page 33 and 34: Deepth (m) 0 Horizontal displacemen
Page 35 and 36: displacemennt, mm Maximum horizonta
Page 37 and 38: The collapse
Page 39 and 40: 3.33pm
Page 45 and 46: Post-collapse Post collapse investi
Page 47 and 48: • Capacity based on BS5950:1990 =
Page 49 and 50: t Cu from Method A Cu from Method B
Page 51 and 52: RL (m) 105 100 95 90 85 80 75 70 65
Page 53 and 54: • Method A over-estimates the und
Page 55 and 56: • St Structural t l design d i er
Page 57 and 58: Excavation of sacrificial JGP in Ty
Page 59 and 60: Shear wave velocity measurements in
Page 61 and 62: Post-collapse Post collapse investi
Page 63 and 64: Depth D (m) Cone resistance, qt (MP
Page 65 and 66: NORTHIING (m) ABH27 31700 31650 316
Page 67 and 68: ELEVATION E (mRRL) 110 100 90 80 70
Page 69 and 70: Buried valley in the Old Alluvium
Page 71 and 72:
Coincidence between buried valley a
Page 73 and 74:
CN3 DN3 GA ABH-32 ABH-34 ABH-85 EN2
Page 75 and 76:
• The buried valley was crossed w
Page 77 and 78:
• 3D effects cannot explain why t
Page 79 and 80:
Post-collapse Post collapse investi
Page 81 and 82:
• WWall ll EI reduced d d tto all
Page 84 and 85:
Elevation (m RL) 100 95 90 85 80 75
Page 86 and 87:
Prop forrce (kN/mm) 4500 4000 3500
Page 88 and 89:
• The analyses matched reasonably
Page 90 and 91:
Trigger required required to initia
Page 93 and 94:
Verrtical dispplacementts (mm) 500
Page 95 and 96:
• Calibrated FE analyses predict
Page 97 and 98:
Post-collapse Post collapse investi
Page 99 and 100:
Axial load (kN) ( 5000 4000 3000 20
Page 101 and 102:
Axial loaad (kN) 5000 4000 3000 200
Page 103 and 104:
Axial load (kN) 5000 4000 3000 2000
Page 105 and 106:
Test on C channel stiffened connect
Page 107 and 108:
Axial load (kN) 5000 4000 3000 2000
Page 109 and 110:
Force, P P DDuctile til strain
Page 111 and 112:
Prop forcee (kN/m) Effect of brittl
Page 113 and 114:
• Th There was relative l ti vert
Page 115:
• Free • Fixed • Forced sway
Page 120 and 121:
DN1E N1W WN24 5 MC3007 CL CL-3G 3G
Page 122 and 123:
WS11E,11F, 12E,13F WS11-13A-D Obstr
Page 124 and 125:
2 301 drag 3 302 dr rag 4 303 drag
Page 126:
• The bored piles had a major inf
Page 129 and 130:
DN1E N1W WN24 5 MC3007 CL CL-3G 3G
Page 131 and 132:
9 th level KP180 Upper JGP Excavati
Page 133 and 134:
Overall conclusions • The use of
Page 135 and 136:
Overall conclusions • The permane
Page 137 and 138:
Overall conclusions • The collaps
Page 139 and 140:
• JGP is a brittle material Lesso
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The Nicoll Highway Collapse

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