Ground Improvement Technology: Micropiles Short Course

1. Ground Improvement Technology – MicropilesFHWA Short CourseDr. Donald A. Bruce

2. Ground Improvement Technology – Micropiles: FHWA Short Course • Contract awarded to ADSC by FHWA. • Course developed by Geosystems, geotechnica, and Schnabel Engineering under direction of 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. Contents of the Course(1½ days of teaching) • 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)

4. 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)

5. 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)

6. Objectives of Lesson 1 Participants will gain insight to the nature and structure of the course and an awareness of the organizations and participants involved

7. Contents of Lesson 1 1.1 Introduction of Instructors 1.2 Introduction of Participants 1.3 Course Administrative issues 1.4 Information about FHWA 1.5 Information about ADSC 1.6 Structure of this Course 1.7 Micropile Questionnaire for Participants 1.8 Review of Team Exercise 1.9 Presentation by Host State

8. Structure of this Course (cont.) 1.6.2 Course Materials • Implementation Manual - Micropile Design and Construction Guidelines • Revised Chapter 6 of Implementation Manual • Copy of Instructor’s Visuals (Participant Workbook) • Team Exercise Workbook 1.6.3 Other Materials • Course Agenda • Micropile Prior Usage Questionnaire • Course Evaluation Form

9. 1.7 Micropile Questionnaire for Participants Purpose: To identify individual and collective experience and needs Method: • Completed questionnaires will be collected at the end of the first coffee break and the results tabulated during lunch break. The tabulated results will be revisited at different points throughout the lessons following lunch break.

10. 1.8 Team Exercise Handout (refer to Team Exercise Workbook) Select Teams Purpose of Exercise – apply all lessons throughout workshop Team work products for this exercise will be presented in Lesson 12 followed by an evaluation of the exercise

11. 1.9 Presentation by Host State • Experiences (good and bad) • Good • Bad • Lessons learned so far • Reliance on existing FHWA/AASHTO documents • Department attitude to use • Reasons for • Growth in use? • Lack of use? • Main Departmental learning goals from this Workshop

12. Learning Objectives of Lesson 1 Gain insight to the nature and structure of the course and an awareness of the organizations and participants involved

13. Advantages of Micropiles • High capacity and surprisingly high stiffness • Installation imparts minimal disturbance to adjacent structures, soil and the environment by noise and vibrations • May be installed in access-restrictive environments • May be installed in all soil and fill conditions types and ground conditions (e.g., boulders, fills, karst, variably weathered rock, high water table)

14. CASE 2 Micropile Arrangements