1. Walter E. Vanderpool Terracon Engineering A Unique Opportunity to Analyze Micropile Long-Term Performance on a Large Scale

2. Purposes Expand knowledge baseExpand knowledge base Confirm presumptive theories of micropile performanceConfirm presumptive theories of micropile performance Identify fundamental characteristics of micropile performanceIdentify fundamental characteristics of micropile performance Correlate soil properties to constructability and long-term performanceCorrelate soil properties to constructability and long-term performance Identify construction details both beneficial and detrimental to long-term performanceIdentify construction details both beneficial and detrimental to long-term performance Isolate seismic impactIsolate seismic impact

3. Available Records Geotechnical Site ExplorationGeotechnical Site Exploration –Ten 200- to 310-foot borings –SPT test data –Index test data –Consolidation test data –CPT test data –Pressure meter test data

4. Available Records (continued) Construction records (eleven 3-ring binders)Construction records (eleven 3-ring binders) –Drill rate by the minute and even second –Steel mill certificates –Grout materials –Fluid grout properties –Placement records (volume and pressure) –Strength –Load tests (over 600)

5. Available Records (continued) InstrumentationInstrumentation –Over 1200 VW transducers & strain gages –Record length (over 5 years) –Calibrations –Pre-installation –Grout curing –Load testing

6. Available Records (continued) MonitoringMonitoring –Hourly record for over 4 years –Response to earthquake –Load migration to steady state –Incremental soil-pile load-deformation with depth and time –Incremental soil profile consolidation by SONDEX

7. Notes System still healthy and operating, but about to be abandonedSystem still healthy and operating, but about to be abandoned Needs sponsor and funding to sustain system beyond original Life-Safety purposeNeeds sponsor and funding to sustain system beyond original Life-Safety purpose In-depth analyses needed to understand long-term micropile performanceIn-depth analyses needed to understand long-term micropile performance

8. Specific Research Goals 1.Analyze all load and movement data so far 2.Collect and monitor future load and strain gage data 3.Collect and monitor future structural movement data

9. Commitments OwnerOwner Local AuthorityLocal Authority ResearcherResearcher Co-Principal InvestigatorsCo-Principal Investigators Funds XFunds X