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sustainability

sustainability project on London Olympic
by

daniel girmay

on 17 January 2013

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Transcript of sustainability

EXPERIMENTAL PROCEURE and apparatus GREENFIELD TUNNEL INTRODUCTION The Product FLUID CONTROL SYSTEM What is tunnel Two types of tunnel
- Cut and cover
- Bored tunnel GEOTECHNICS Kaolin powder Natural deposit BY-DANIEL GIRMAY
CITY UNIVERSITY LONDON Resources CENTRIFUGE TESTING OF TWIN-TUNNELLING INDUCED SETTLEMENT DATA
ANALYSIS CONCLUSION - Transport links
- Surface and subsurface deformations
- Damage pre existing structures
- TBM come up with fewer disturbance
- Volume loss determned as percentage
- Ground movement estimation
- Bring the settlement to a minimum
- Precisely consider all scenarios from settlement Effective stress Macro-fabric Slurry Strength and stiffness Centrifuge model and prototype Two main issues in centrifuge modelling Bored tunnel
- Impactful method in urban area TBM - Open face tunnelling
. Well chosen in all cases
. Sprayed concrete
. Soil ahead of the face is reinforced
- Close face tunnelling
. For softer cohesive soil
. Screw conveyor
. Injection of slurry and foams Slurry shield machine Earth pressure balance calibration transducers Model preparation 3 4 5 2 6 1 Junction box Testing the model The centriguge Model after construction Data analysis Experiment data analysing
- Pore and tunnel pressure against time
- LVDT's calculated and changed it's unit in to mm
- Graph plotted settlement/D against distance/D
- Max settlement 0.341mm or settlement/D 0.0086 Calculating volume loss using theoretical value Calculating area deflected during tunnel construction
- Polynomial curve fitted and equation calculated
- Polynomial curve divided in to 4o parts at 10mm interval
- Using trapezoidal and simpson method A= 78.45mm^2
- Volume loss calculated = 3.12%
- Difference was 0.12% calculation Smax using theoretical parameters to plot Gaussian curve
- Point of inflextion i=k*z k=0.5 for clay i=0.5*100=50mm
- i/D D=40mm i/D=50/40=1.25
- Smax=(0.133*0.03*D^2)/i= 0.301mm Smax / D=0.00752
- - - Membrane 240mm long and 0.5mm thickness
- consists 2 circular aluminium end pieces (6.5mm), rubber bag, 6mm outer and 3mm internal diameter of hollow rod
- connected with external brass fittings
- O-ring groove across circumference - LVDT's
45mm
- TPT
- PPT Strong box
- Internal dimension 375 x 550mm
- has a grooves cut
-replaced by PMMA window
- internal support window 12.7mm thick
- external observation window 83mm thick
- 5 holes at the back of the strong box Fabricated jig
- Square aluminum cutter
- Above 182mm clay was trimmed Adjustable tunnel cutter
- Second jig was fitted
- Tunnel guide cutter move horizontally
- 40mm dia. circular aluminum cutter
- Tunnel bored at 3D position
- 100mm below the top surface of the model
- Marker beads Preparing a slurry
- Mixing the slurry
- 120% moisture content
- Agitate the slurry to avoid air Consolidation hydraulic press
V. stress from 10 upto 500kpa
V. stress reduced to 250kpa - Over consolidated sample removed
- Water flush out
- Front side strong box removed
- Surface sealed with silicon oil - 1.8m radius
- Run at 100g
- Consist of different parts - 134.3 kg weighted the strong
box including all accessory
- 450mm silicon poured
- Transducers connected
- Two standpipe clamped
on the swing bed
- Keep running for 24hrs
- Pressure equalized
- 7.54ml water extract from
each tunnel - Clamped onto strong box
- 2 pipes connected to fluid controlling system and hollow rod
- The pipes de-aired
- Using syringe tunnel membrane filled with water - Transducers disconnected
- Silicon removed
- Shear vane apparatus
- Observation and support window removed
- Latex membrane removed carefully
- Model demolished Centrifuge controlling room
- runs at 100g
- control and monitor the spining
- connected to CCTV camera
- image recording
- Reading collaborating PP
performance in each channel
- Data saved 7 8 9 10 - A T cross section area of tunnel 1.257*10^3mm^2 - V T total volume of cavity = 251.3274*10^3mm3 - V L volume loss = 0.03*V T = 7.5398*10^3mm^3= 7.54 ml - Sv= Smax exp(-y^2/2i^2) - Under ground passage
- Cars, pedestrian and nuclear waste storege
- Reduce environmental impact - Positive head pressure
- Fluid conveyance
- Isolated slurry from the muck - For softer cohesive soil
- Screw conveyor
- Injection of slurry & foams Thank you for listening w what is next?
- to do another test, construction
of twin tunnel at different time
- analysis data
- compare the max settlement
- writing up a final report
Full transcript