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Abhinav Huli Civil Engineer Haley & Aldrich, Manchester, NH Bradford A. Miller, P.G.

IMPORTANCE OF USING GRAPHICAL METHOD TO UNDERSTAND THE INFLUENCE OF CRITICAL GEOTECHNICAL PARAMETERS USED IN HDD DESIGN. Abhinav Huli Civil Engineer Haley & Aldrich, Manchester, NH Bradford A. Miller, P.G. Senior Technical Specialist-Geology Haley & Aldrich, Boston, MA.

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Abhinav Huli Civil Engineer Haley & Aldrich, Manchester, NH Bradford A. Miller, P.G.

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  1. IMPORTANCE OF USING GRAPHICAL METHOD TO UNDERSTAND THE INFLUENCE OF CRITICAL GEOTECHNICAL PARAMETERS USED IN HDD DESIGN Abhinav Huli Civil Engineer Haley & Aldrich, Manchester, NH Bradford A. Miller, P.G. Senior Technical Specialist-Geology Haley & Aldrich, Boston, MA

  2. Three Stages of HDD Pilot Hole: Establish the intended alignment from entry to exit (CAPP Publication 2002-0022)

  3. Three Stages of HDD (Cont’d) Reaming: Increase the diameter of the pilot borehole as necessitated by the product pipe (CAPP Publication 2002-0022)

  4. Three Stages of HDD (Cont’d) Pipe Pullback: The product pipe is pulled into the borehole to its final alignment (CAPP Publication 2002-0022)

  5. Intersect method of HDD www.mears.net

  6. www.mears.net

  7. Assessment of subsurface conditions Why? • Quantification of maximum confining stress • Quantification of minimum drill pressures How? • Appropriate geotechnical boring plan • Pertinent laboratory tests based on the design method • Geophysical methods (if necessary) • Geotechnical data/baseline report with focus on critical soil parameters for HDD design

  8. Critical design considerations Constantly changing subsurface conditions • Soils • Shear modulus • Cohesion • Friction angle • Rock • Unconfined compressive strength • Abrasion • Durability Constantly changing drill fluid properties due to its interaction with the soil leading to changes in • Density • Plastic viscosity • Yield point • Gel strength

  9. Proposed graphical design method Surface profile HDD alignment

  10. Anticipated maximum allowable pressure HDD alignment

  11. Anticipated minimum drill pressure Anticipated maximum allowable pressure

  12. Advantages of proposed methodology • Test “What If” scenarios • Run parametric analysis • Understand importance of iterative method of real-time drill fluid management • Discusses critical design considerations • Use of supplemental graphical software to visualize and optimize solutions

  13. Thank You Abhinav Huli Civil Engineer Haley & Aldrich, Manchester, NH Bradford A. Miller, P.G. Senior Technical Specialist-Geology Haley & Aldrich, Boston, MA

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