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David Faux Student ID: September 2015

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Presentation on theme: "David Faux Student ID: September 2015"— Presentation transcript:

1 David Faux Student ID: 1305074 September 2015
School of Civil Engineering Stabilising the Future of Working Platforms MSc Geotechnical Engineering & Management Research Project David Faux Student ID: September 2015

2 PRESENTATION FORMAT JUSTIFICATION FOR RESEARCH
AIM OF STUDY & METHODOLOGY RESULTS & DISCUSSION LITERATURE REVIEW DATA ANALYSIS CASE STUDY CONCLUSIONS QUESTIONS

3 WORKING PLATFORMS - JUSTIFICATION FOR RESEARCH
HEALTH & SAFETY – CRITICAL IMPORTANCE TRADITIONAL WORKING PLATFORM DESIGN – BRE 470 OVER CONSERVATIVE DESIGN SUSTAINABILITY CONCERNS STABILISED SOILS MAY PROVIDE THE ANSWER NO DESIGN GUIDANCE FOR WORKING PLATFORMS SIGNIFICANT UNDERUSE OF THE METHOD ADDITIVES TO IMPROVE MATERIAL PERFORMANCE ROADCEM – ADDITIVE BASED ON NANO-TECHNOLOGY

4 CASE STUDY – LAB TESTING & DESIGN
AIM & METHODOLOGY TO IDENTIFY A VIABLE DESIGN PROCEDURE FOR WORKING PLATFORM DESIGN USING CEMENT BOUND MATERIAL (CBM). LITERATURE REVIEW DATA ANALYSIS CASE STUDY – LAB TESTING & DESIGN

5 RESULTS - LITERATURE REVIEW
BRE 470 – WORKING PLATFORMS FOR TRACKED PLANT CBM FOR ROAD CONSTRUCTION ROADCEM FOR ROAD CONSTRUCTION PRESSURE IMPOSED BY PILING RIG TRACKS (UDL - kPa) IN-SITU SOIL CHARACTERISATION (PI, LL, PSD, OMC/DD) BISAR – STRESS/STRAIN IMPOSED BY LOADING. BREAKING STRAIN KEY DESIGN CRITERIA. PROPOSED WORKING PLATFORM DESIGN USING STABILISED SOILS

6 RESULTS - DATA ANALYSIS ROADCEM CBM
INCREASED DYNAMIC ELASTIC MODULUS INCREASED BREAKING STRAIN

7 RESULTS - CASE STUDY - BACKGROUND
SEVERN TRENT – PROPOSED SETTLEMENT TANKS CLAYMILLS, BURTON UPON TRENT, STAFFORDSHIRE 1381 No. PRECAST CONCRETE DRIVEN PILES 6000m2 WORKING PLATFORM REQUIRED ONLY ACCESS TO SITE VIA CROSSING RAIL LINE SOFT LOW PLASTICITY CLAY AT THE SURFACE 650mm WORKING PLATFORM USING BRE470 SIGNIFICANT LORRY MOVEMENTS TO DELIVER METHOD DEEMED UNSATISFACTORY DUE TO COSTS AND IMPACT ON RAIL LINE

8 RESULTS - CASE STUDY - PRELIMINARY DESIGN
SOIL STABILISATION USING CEMENT & ROADCEM PRELIMINARY DESIGN CRITERIA PROVIDED BY POWERCEM TECHNOLOGIES (2009) LOW PLASTICITY CLAY – 1.8/180kg/m3 ROADCEM/CEMENT MIX DYNAMIC ELASTIC MODULUS (EMOD) = 4 GPa (DESIGN PARAMETER) UNCONFINED COMPRESSIVE STRENGTH (UCS) = 3 MPa (PERFORMANCE CRITERIA) BREAKING STRAIN = 200µm (PERFORMANCE CRITERIA)

9 RESULTS - CASE STUDY - PRELIMINARY DESIGN
BISAR SOFTWARE – ORIGINALLY DEVELOPED BY SHELL FOR OIL RIG PLATFORMS ITERATIVE PROCESS- STRESS/STRAIN/DISPLACEMENT ASSESSMENT RIG LOADING (kPa) DYNAMIC ELASTIC MODULUS (GPa) PLATFORM THICKNESS (mm) DEVELOPMENT OF STRESS/STRAIN

10 RESULTS - CASE STUDY - PRELIMINARY DESIGN
STRESS DEVELOPED WITHIN TOP OF LAYER IS WELL BELOW ANTICIPATED UCS DISPLACEMENT IS <5mm – NOT SIGNIFICANT FOR WORKING PLATFORMS BREAKING STRAIN IS KEY DESIGN CRITERIA – MAINTAIN BELOW 200µm CHART BASED ON PROPOSED PILING RIG (RB 5000 HAMMER RIG) WORKING PLATFORM SHOULD BE 325mm THICK

11 RESULTS - CASE STUDY – IN-SITU SOIL TRIALS
OMC/DD RELATIONSHIP IN ACCORDANCE WITH EN UCS ON CYLINDRICAL SHAPE MOULDS IN ACCORDANCE WITH EN EMOD ON CYLINDRICAL SHAPE MOULDS IN ACCORDANCE WITH EN 3 POINT BENDING TEST ON BEAM SPECIMENS TO DETERMINE BREAKING STRAIN IN ACCORDANCE WITH EN

12 CASE STUDY – IN-SITU SOIL TRIALS
REQUIRED 5 DAYS REQUIRED BREAKING DAYS

13 RESULTS – CASE STUDY – IN-SITU SOIL TRIALS
14 DAY CURING PERIOD SPECIFIED PRIOR TO PILING WORKS IN-SITU TRIALS SHOWED HIGHER PERFORMANCE THAN ASSUMED PARAMETERS VALUE ENGINEERING – REVIEW STRESS/STRAIN ASSESSMENT 14 DAYS = 5500 mpa revised platform thickness = 250mm

14 CONCLUSIONS 250mm THICK PLATFORM AND PILING WORKS UNDERTAKEN SUCCESSFULLY 400mm reduction from traditional working platform design Reduced the construction programme by 3 weeks Saved approximately £70,000 on project costs Eliminated the need for 3600m3 of soil to be TAKEN TO LANDFILL Eliminated the need for 3000m3 of imported granular material Eliminated approximately 2000 lorry movements to the site Eliminated the need for concrete binding of the structure

15 CONCLUSIONS stabilised soils have the potential to deliver cost savings significant environmental benefits roadcem can improve the performance of cbm: unconfined compressive strength stiffness (Emod) breaking strain particularly useful for working platform design further research required: roadcem material behaviour different soil types the design method shown within this study can be used for future projects

16 CONCLUSIONS - DESIGN FLOW CHART

17 WORKING PLATFORMS - QUESTIONS
THANK YOU FOR LISTENING... ANY QUESTIONS?


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