Jan 18, 2005 - construction of the 16m deep basement. ⢠Applying the ... 1.2m secant wall. ⢠2 levels of props ... 1.0m diaphragm wall. ⢠1 level of props.
Comité Français de Mécanique de Sols et Géotechnique and the British Geotechnical Association
APPLICATION OF THE OBSERVATIONAL METHOD AT KINGS PLACE LONDON
OM at Kings Place • The decision making process for construction of the 16m deep basement • Applying the observational method • Outcomes and lessons learnt
The Project Team • Client - Parabola Land (Peter Millican) • Main Contractor - Sir Robert McAlpine • Engineer - Arup Newcastle
Ground conditions
Made ground
BASEMENT London Clay
Lambeth Group
16m deep basement construction
Original scheme 1.2m secant wall • 2 levels of props • 240 bearing piles • 1.5m thick raft
London Clay
Lambeth
Alternative scheme • 1.0m diaphragm wall • 1 level of props • 1.0 to 1.5m raft slab
London Clay
Lambeth
?
Decision process
Capping beam/prop analysis
Analyses • Demonstrate that the proposal works – By hand – 2D analyses - Wallap – 3D analyses - FLAC
FLAC3D 2.10 Step 9096 Model Perspective 16:54:55 Tue Jan 18 2005 Center: X: 4.800e+001 Y: 4.500e+001 Z: -9.125e+000 Dist: 3.388e+002
0 5 10 15 20 25 30 35 40 45 E = 400Cu/800Cu Maximum Displacement = 42.0mm
Displaced shape and contours of displacement magnitude at 4.5 years
Prop failure?
With slab and prop -0.009/+0.019
Without slab and prop -0.122/+0.040 -0.120
-0.080 -0.040 0 Contour interval = 0.020
+0.040
Monitoring considerations
• • • • • • • • •
Limit criteria for adjacent property Primary monitoring system Trigger level definition System accuracy Contingency measures Frequency of readings Secondary monitoring system Key personnel Data dissemination
• Each wall panel would have to be propped • Adequate wall reinforcement was provided • Couplers would be required slab reinforcement
Full depth excavation of east wall
East wall displacement
South wall displacement
Inclinometer results
East wall
West wall
Inclinometer results
North wall
South wall
Prop loads
Prop loads
Comparative outcome
Prop removal
Lessons learned General • Minimising damage to adjacent property is the critical issue • Real data informs the whole process • Calculations must be ‘honest’ • Corners are stiff • Excavation sequences can be used positively • Data volumes need to be manageable Kings Place specific • High strain response due to relatively flexible wall • Vertical movements on retained side less than predicted
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