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ADSC-FHWA Micropile NHI Course Upgrade

Upgrade of the ADSC-FHWA Micropile teaching module into a National Highway Institute (NHI) course, including revisions to the FHWA Implementation Manual and course curriculum materials.

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ADSC-FHWA Micropile NHI Course Upgrade

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  1. Development of ADSC-FHWA Micropile Teaching Module into NHI CourseDr. Donald A. Bruce

  2. Ground Improvement Technology – Micropiles: Original ADSC-FHWA Short Course • Contract awarded to ADSC by FHWA in 2002. • Course developed by Geosystems, geotechnica, and Schnabel Engineering under direction of IWM member Barry Siel (FHWA). • Based on FHWA Implementation Manual (DBM). • Deliverables • Participant’s Workbook • Instructor’s Guide • “Walk Through” (FHWA in D.C.) • Demonstration (WA State DOT) • Course now transferred to NHI

  3. Update of FHWA course to NHI Course • FHWA awarded contract to Ryan R. Berg & Associates in 2004 • Work involves updating original course to adhere to National Highway Institute requirements • Technical consultants included: • Dr. P. Sabatini, Lead Revision Author • ADSC Micropile Committee as Technical advisors (including IWM members T. Armour, D. Bruce, A. Cadden, T. Richards, J. Wolosick) • Adult Education specialist • Peer reviewers as required

  4. Update of ADSC-FHWA Course to NHI Course • Technical scope of work includes: • Updating and revising FHWA Micropile Implementation Manual (originally developed by DBM) • Revising course curriculum materials • Instructor’s Guide • Participant’s Workbook • Visual Aids • Deliver course walk-through at NHI office • Deliver 2-day pilot presentation • Deliver regular 2-day course presentations

  5. Contents of the Course • Lesson 1: Introduction (45 mins) • Lesson 2: Definitions, Background, and Classification (Chapters 1 and 2 of Manual) (30 mins) • Lesson 3 – Applicability and Applications Chapter 3 of Manual) (45 mins) • Lesson 4 – Construction Techniques and Materials (Chapter 4 of Manual) (60 mins)

  6. Contents of the Course (continued) • Lesson 5 – Design Basics – Structural Support (150 mins) • Lesson 6 – Design for Slope Stabilization and Earth Retention (30 mins) • Lesson 7 – Pile Load Testing (Chapter 7 of Manual) (45 mins) • Lesson 8 – Construction Inspection – Quality Control (Chapter 8 of Manual) (30 mins)

  7. Contents of the Course (continued) • Lesson 9 – Contracting Method (Chapter 9 of Manual) (20 mins) • Lesson 10 – Feasibility and Cost Data (Chapter 10 of Manual) (20 mins) • Lesson 11 – Review of Ongoing Research (20 mins) • Lesson 12 – Team Exercise (60 mins) • Closure (15 mins)

  8. Revisions to FHWA Implementation Manual • Inclusion of information as appropriate from FOREVER, AASHTO ASD specifications, AASHTO LRFD specifications, GEC No. 4 (Anchored structures), and GEC No. 7 (Soil nail walls) • Update manual graphics • Inclusion of relevant applications of micropiles from recent case histories • Update load testing data forms and micropile inspection forms

  9. Revisions to FHWA Implementation Manual • Major revisions to Chapter 5 (Design Basics – Structural Support • Strength and serviceability limit state conditions of single and groups of micropiles in compression, tension, and combined axial load and bending • Evaluation of lateral capacity of micropiles under seismic loading • Effects of liquefaction on lateral capacity and downdrag forces • Design of appropriate corrosion protection measures

  10. Revisions to FHWA Implementation Manual • Major revisions to Chapter 5 (Design Basics – Structural Support (continued) • Design methods for inclined micropiles • Updated safety factors based on number of load tests performed • Description of failure mechanisms • Background on selection of k-values for buckling analyses and calculations for pile group centroids and moments of inertia

  11. Revisions to FHWA Implementation Manual • Major revisions to Chapter 6 (Design for Slope Stabilization and Earth Retention) • Re-present Chapter 6 material in a manner stronger than a design concept without endorsing a specific design methodology • Revision and update of figures • Develop Case 1 non-reticulated micropiles with a concrete cap beam as a “structural frame” • Include section on economics of micropiles for slope stabilization

  12. Revisions to FHWA Implementation Manual • Revisions to Chapter 7 (Pile Load Testing) • Provide specific guidance on number of load tests to be performed • Add recommendations on load testing procedures and interpretation of results consistent with other deep foundation load tests • Discuss integrity testing and Statnamic testing • Provide sequences for verification, proof, and creep tests • Provide appropriate acceptance criteria

  13. Revisions to Course Curriculum • Editorial revisions to Instructor’s Guide, Participant’s Workbook, and PowerPoint slides (visual aids) to adhere to NHI requirements

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