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Innovative Slope Stabilisation Works

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The document summarizes an innovative highway stabilization project on the Rimutaka Hill Road in New Zealand. A design-build approach was used where the contractor and consultant worked collaboratively on the design. The remedial design solution involved soldier pile walls, ground improvement piles, and rock anchors to stabilize slopes of varying bedrock depths. Construction proceeded smoothly through quality control of piling, rock anchors, and drainage installation. The project was completed on time and on budget through the innovative design-build approach and cooperative problem solving between parties.

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Innovative Highway Stabilisation on Rimutaka Hill Road Selvem Raman Opus International Consultants 8 th Young Geotechnical Professionals Conference
Outline Design & Build Concept Background Remedial Design Solution Construction Conclusion Interactive Session (Q & A)
Background Who's Who ? Principal TRANSIT NZ (now NZTA) Principals Advisor MWH D & B Contractor Fulton Hogan Designer Opus International Consultants
Background Project Location
Background Project Location
Background Site Features 1 2 3 4 5
Background Principal's Requirement Design to TRANSITs Bridge Manual Design Durability life of 50 years Reduced Seismic Design with PGA of 0.2g Other relevant specifications and codes Cost savings shared 50:50 with the Principal This section of the road will be realigned in 20 years Specimen Design : For tenderers information and scheme and statutory applications only!!!!!
Design & Build Concept Teaming Up Contractor & Consultant Challenge Proactive & Collaborative Approach Innovation Eager to Win Risk Management The Winning Bid Innovative Design Internal & External Design Review Construction Stage - Perception Resolving Problems Collaborative Approach
Remedial Design Solution Segmentation DEEPER BEDROCK
Remedial Design Solution Soldier piles with rock anchors Soldier piles with deadman anchors Shallow Bedrock
Remedial Design Solution Contiguous bored piles with 2 levels of rock anchors Soil nailing of the slope below the road 3 rows of concrete columns along the edge of the road Deep Bedrock
Remedial Design Solution Final Design
Remedial Design Solution Unanchored Soldier Pile wall, where depth to bedrock is up to 3 m Anchored Soldier Pile wall, where depth to bedrock is 3 m to 13 m Ground Improvement Piles, where depth to bedrock is greater than 13 m Final Design
Remedial Design Solution Soldier Pile wall Ground Improvement Piles Rock Anchors Final Design
Remedial Design Solution Strip Drains Weepholes Trench cut-off drains Kerb drain Sub-horizontal drainage holes New discharge culverts New culvert outlets connected to flexible hose Hydroseeding (stability, drainage & aesthetics) Drainage Measures KEY IMPROVEMENT REQUIRED!!!!!
Construction Quality Control Issues Site Issues Material Testing Concrete, grout, strand, etc. Pile Testing Down-hole camera, Sonic Logging, TDR Rock Anchor Pull-out testing, down-hole camera, Suitability & Acceptance testing Contractor still expected Consultant to take charge Proceeded smoothly
Construction Piles
Construction Rock Anchors
Construction Drainage
Current View
Conclusion Innovative Design Concept Cost effective and robust solution D & B method - a comparable if not cost effective alternative to conventional procurement method The contractor was delighted all the issues were resolved amicably The principal was satisfied - project proceeded smoothly and value for money Principals Advisor was happy - contract management went smoothly
Conclusion Innovation essential to win D & B Projects Proactive risk management fundamental when innovating and in D&B environment Issues with Independent Checkers Innovative designs, not traditional! Contractors expect Designers to exercise control even in a D & B environment Approach issues together and solve them! If we can help resolve contractors problems better relationship Any more D & B projects New Zealand????? Lessons Learned
Acknowledgements Transit New Zealand NZ Geotechnical Society & EQC Fulton Hogan Opus International Consultants
Q&A ?

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Innovative Slope Stabilisation Works

  • 1. Innovative Highway Stabilisation on Rimutaka Hill Road Selvem Raman Opus International Consultants 8 th Young Geotechnical Professionals Conference
  • 2. Outline Design & Build Concept Background Remedial Design Solution Construction Conclusion Interactive Session (Q & A)
  • 3. Background Who's Who ? Principal TRANSIT NZ (now NZTA) Principals Advisor MWH D & B Contractor Fulton Hogan Designer Opus International Consultants
  • 7. Background Principal's Requirement Design to TRANSITs Bridge Manual Design Durability life of 50 years Reduced Seismic Design with PGA of 0.2g Other relevant specifications and codes Cost savings shared 50:50 with the Principal This section of the road will be realigned in 20 years Specimen Design : For tenderers information and scheme and statutory applications only!!!!!
  • 8. Design & Build Concept Teaming Up Contractor & Consultant Challenge Proactive & Collaborative Approach Innovation Eager to Win Risk Management The Winning Bid Innovative Design Internal & External Design Review Construction Stage - Perception Resolving Problems Collaborative Approach
  • 9. Remedial Design Solution Segmentation DEEPER BEDROCK
  • 10. Remedial Design Solution Soldier piles with rock anchors Soldier piles with deadman anchors Shallow Bedrock
  • 11. Remedial Design Solution Contiguous bored piles with 2 levels of rock anchors Soil nailing of the slope below the road 3 rows of concrete columns along the edge of the road Deep Bedrock
  • 12. Remedial Design Solution Final Design
  • 13. Remedial Design Solution Unanchored Soldier Pile wall, where depth to bedrock is up to 3 m Anchored Soldier Pile wall, where depth to bedrock is 3 m to 13 m Ground Improvement Piles, where depth to bedrock is greater than 13 m Final Design
  • 14. Remedial Design Solution Soldier Pile wall Ground Improvement Piles Rock Anchors Final Design
  • 15. Remedial Design Solution Strip Drains Weepholes Trench cut-off drains Kerb drain Sub-horizontal drainage holes New discharge culverts New culvert outlets connected to flexible hose Hydroseeding (stability, drainage & aesthetics) Drainage Measures KEY IMPROVEMENT REQUIRED!!!!!
  • 16. Construction Quality Control Issues Site Issues Material Testing Concrete, grout, strand, etc. Pile Testing Down-hole camera, Sonic Logging, TDR Rock Anchor Pull-out testing, down-hole camera, Suitability & Acceptance testing Contractor still expected Consultant to take charge Proceeded smoothly
  • 21. Conclusion Innovative Design Concept Cost effective and robust solution D & B method - a comparable if not cost effective alternative to conventional procurement method The contractor was delighted all the issues were resolved amicably The principal was satisfied - project proceeded smoothly and value for money Principals Advisor was happy - contract management went smoothly
  • 22. Conclusion Innovation essential to win D & B Projects Proactive risk management fundamental when innovating and in D&B environment Issues with Independent Checkers Innovative designs, not traditional! Contractors expect Designers to exercise control even in a D & B environment Approach issues together and solve them! If we can help resolve contractors problems better relationship Any more D & B projects New Zealand????? Lessons Learned
  • 23. Acknowledgements Transit New Zealand NZ Geotechnical Society & EQC Fulton Hogan Opus International Consultants
  • 24. Q&A ?