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: 1305074 September 2015

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

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

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

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

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

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

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)

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

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

RESULTS - CASE STUDY – IN-SITU SOIL TRIALS OMC/DD RELATIONSHIP IN ACCORDANCE WITH EN 13286-2 UCS ON CYLINDRICAL SHAPE MOULDS IN ACCORDANCE WITH EN 13286-41 EMOD ON CYLINDRICAL SHAPE MOULDS IN ACCORDANCE WITH EN 13286-43 3 POINT BENDING TEST ON BEAM SPECIMENS TO DETERMINE BREAKING STRAIN IN ACCORDANCE WITH EN 1015-11

CASE STUDY – IN-SITU SOIL TRIALS REQUIRED EMOD @ 5 DAYS REQUIRED BREAKING STRAIN @ 11 DAYS

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 EMOD @ 14 DAYS = 5500 mpa revised platform thickness = 250mm

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

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

CONCLUSIONS - DESIGN FLOW CHART

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