Development of ADSC-FHWA Micropile Teaching Module into NHI Course Dr Development of ADSC-FHWA Micropile Teaching Module into NHI Course Dr. Donald A. Bruce

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

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

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

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)

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)

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)

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

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

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

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

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

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