CASE STUDY: Evaluating alternative railway route alignments

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Francois Heyns, Technical Director, Railway Engineering, from Aurecon has presented at the Heavy Haul Rail Africa. If you would like more information about the conference, please visit the website: www.railconferences.com/heavyhaulrail/africa

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CASE STUDY: Evaluating alternative railway route alignments

  1. 1.   Africa  Status  Quo    Challenges    Approach    Cos5ng  OPEX  &  CAPEX    Life  cycle  cos5ng    Conclusion  PRESENTATION  CONTENT  Evalua5ng  alterna5ve  railway  route  alignments  
  2. 2. Gauge:1 067 mm1 000 mm1 435 mm
  3. 3. 80 000 km - 7% of World total
  4. 4. THE  CHALLENGE  TO  MINING  COMPANIES……  •  The  logis4cal  solu4on  to  export/import  bulk  commodi4es  from  mines  •  First  order  studies  on  the  logis4cal  solu4on  to  validate  the  viability  of  the  mine.        
  5. 5. Bulk Material Handling ChainRailway: MainlineMineArrivals/Dep YardStockpileLoad-outConveyorLoopTelecomms&SignalingWorkshopsBuildings/DepotsCrossing loopsPortArrivals/Dep YardShiploaderStockpileTipplerConveyorConveyorLoopStackerReclaimers
  6. 6. •  Design  traffic  •  Track  gauge  •  Track  geometry  -­‐    ruling  grades,  radii  •  Earthworks  •  Track  Superstructure  •  etc.  ESTABLISHING  THE  DESIGN  PRINCIPLES/CRITERIA  
  7. 7. METHODOLOGY  IN  ESTABLISHING  A  ROUTE  ALIGNMENT  •  Global  Mapper  (SRTM  data  Spa4al  informa4on);  •  Google  Earth;  •  Map  Source;    •  Trimble  –  op4miza4on  soSware,  and  •  Design  soSware  such  as  Inrail,  Civil  Designer,  Civil  3D,  etc.  
  8. 8. 36 RoutesConsidered
  9. 9. LONG  SECTIONS  
  10. 10. AERIAL  SURVEY  LIDAR  system  
  11. 11. SRTM  VS  LIDAR  SURVEY  
  12. 12. MASS  EARTHWORKS  
  13. 13. Cuts & Fills1  2  3  4  
  14. 14. Bridges1  2  3  4  
  15. 15. ALIGNMENT  COMPARISON  SUMMARY  Route Characteristic 1 2 3 4 5Total Route Length To Nkaya JunctionHighest route elevationSpecial StructuresTotal Length of Special StructuresSmallMediumRiverCrossingsLargeRoad CrossingsNumber ofbridges:Total bridgesCulvertsCut volumes (Million)EarthworksquantitiesFill volumes (Million)% of earthworks compared to 2006 studyMax Grade in Loaded DirectionMax Grade in Empty DirectionRoute topography
  16. 16. CONSIST  SIZING  (MIN  CONT  SPEED  25.3  KPH)  
  17. 17. CROSSING  LOOP  LOCATIONS    
  18. 18. LIFE  CYCLE  COST  COMPARISON  OF  ALTERNATIVE  ALIGNMENTS  CAPEX  Examples  :  • Locomo4ves;  • Wagons;  • Rail  Yard;  and  • Track,  etc.  OPEX  examples:  • Crewing;  • Fuel;  • Locomo4ve  maintenance;  • Wagon  maintenance;  • Yard  maintenance;  and  • Business  overheads.  
  19. 19. OVERALL  MCA  SCORES    1   2   3   4   5  
  20. 20. PRESENT  VALUE  (PV)  EVALUATION  1        2        3      4    5  
  21. 21. CONCLUSION  Satellite  data  can  be  used  very  effec4vely  in  a  first  order  geometric  design  study  to  establish  a  viable  horizontal  and  ver4cal  rail  alignment  along  with  the  associated  infrastructure  cost  such  as  earthworks,  bridges,  drainage,  trackwork,  etc.    The  analysis  showed  allows  the  mining  companies  to  make  important  decisions  regarding  the  viability  of  the  mine  i.e.  the  dollar  rate  per  tonne  to  import/export  the  bulk  commodity.      This  may  prompt  further  studies  or  maybe,  more  importantly,  stop  the  mine  from  spending  unnecessary  further  capital  on  detailed  studies  that  may  include  costly  topographical  or  geotechnical  surveys.  

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