Design and Construction of Drilled Full Displacement Piles using the Penetration Resistance Method

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1 SUPERPILE 2009 Burlingame, CA Design and Construction of Drilled Full Displacement Piles using the Penetration Resistance Method Peter Faust Malcolm Drilling Company Inc.

2 Alexandria Parking Garage, San Francisco Design Build 321 Piles DIA = ft 620 kips C. 225 kips T. 375 ft 120 ft 2

3 Client Cost/Time Effective Foundation System Low Environmental Impact (Noise/Vibration) Reduce Spoils (Landfill with Contaminants) Geotech Consultant 8 SPT Borings + 1 CPT Sounding Evaluation of Soil Bearing Capacity Test Program of various Foundation Systems Displacement Pile Recommendation 3

4 Design Build Contractor Additional CPT Soundings Test Pile Program Site Specific Pile Design Indicator Test Piles to confirm Assumptions Savings due to Pile-by-Pile Design 4

5 8 SPT 25 CPT 5 Load Tests 20 Indicator Piles 5

6 Fill Soft Clay Dense Sand Sandy Clay Shale/Claystone 6

7 Site Soil OMEGA Pile Design Construction QA/QC Displacement Piles Definition: A small diameter (< 36 ) continuously drilled and grouted pile with or without steel reinforcement. Axial Capacity: up to 2,000 kips Ultimate in Soil Friction: High Tension & Compression Capacity Slender: Medium Lateral Capacity Applications: Foundation, Ground Improvement to Reduce Liquefaction Risk 7

8 Site Soil OMEGA Pile Design Construction QA/QC Advantages Lateral Soil Compaction Low Settlements Higher Soil Resistance % Higher Capacity Than Conventional Pile Very little Spoils (Ideal in Contaminated Soils) No Vibrations and little Noise during Installation Fast and Efficient Installation 8

9 Site Soil OMEGA Pile Design Construction QA/QC Conventional Drilled Pile Displacement Pile Compacted Soil Shear Resistance Increased Shear Resistance Base Resistance Increased Base Resistance Soil Compaction will increase Shear and Base Resistance 9

10 Site Soil OMEGA Pile Design Construction QA/QC MDCI is License Holder in the Western US 10

11 Site Soil OMEGA Pile Design Construction QA/QC Full Displacement Pile (FDP) Reverse Flighting Soil Transport Omega Pile Other FDP 11

12 Site Soil OMEGA Pile Design Construction QA/QC Concrete Pressure Gage On Board Software [B-Tronic] Flowmeter (Opt.) Stroke Counter 12

13 Site Soil OMEGA Pile Design Construction QA/QC 3 Feet 15 Feet Full Displacement Tool Partial Displacement Tool 13

14 Site Soil OMEGA Pile Design Construction QA/QC Drilling Grouting 14

15 Site Soil OMEGA Pile Design Construction QA/QC Cage Installation Pile Cap Work 15

16 Top Cage Center Bar 16

17 750 kip Compression Tests 225 kip Tension Test Telltail Loadcell Spherical Bearing 500T Jack 17

18 Pile Length Adjustment CT-03 CT-10 ~ 400 Kips CT-10 CT-03 ~ 800 Kips Load-Settlement Curve CPT Sounding 18

19 Design Considerations 1. SPT and/or CPT Soil Investigation 2. Direct Assessment of Bearing Capacity Van Impe, Bustamante, Ne Smith 3. Test Pile Installation with Electronic Monitoring of Installation Parameter (B-Tronic) 4. Static Load Test Program 5. Relate Test Results to Penetration Resistance CPT Resistance 19

20 Geotechnical Site Report Test Pile Installation and Recording of Penetration Resistance (ALPHA Value) Pile Load Test (s) Comparison of Test Load and ALPHA Value Set Target ALPHA Value in Drilling Software (B-Tronic) Adapted Pile Length (Pile-by-Pile Design) due to Self- Investigating Drilling System using the Target ALPHA Value 20

21 Pile-by-Pile Design Pile Depth Variation should be accepted as intrinsic component 21

22 ALPHA VALUE [Penetration Resistance] 22

23 ALPHA Value [Penetration Resistance] Site Specific Tool Specific Drill Rig Specific Real Time Display Hole-by-Hole CPT Pile Depth ALPHA Value 23

24 Soft Clay Soft Spot Soft Spot 24

25 CPT Data Test Pile Data Indicator Piles Alpha Value CPT Sounding Installation Criteria ~600 kips (~4tsf *4.7sf/lf*16ft) Alpha 2,000 for 4 meter + Alpha 5,000 for 1 meter 25

26 1 >5,000 3 >2,000 Request by inspector to exceed criteria α = 5,000 α = 2,000 Delay Crowd Speed < 0.4 m/min = Drilling Refusal Time Related Penetration Resistance (ALPHA Value) 26

27 Operators View 27

28 28

29 ALPHA Value Why? Optimize Drilling Progress Less Wear and Tear on Tools and Machine Enables Pile-by-Pile Design Reproducible Test-Pile Conditions Automatic QA/QC Protocols Pile Length Reduction 29

30 Site Soil OMEGA Pile Design Construction QA/QC B-Tronic Log Inspectors Log 30

31 OMEGA Piles by Malcolm Drilling Cost Efficient Pile System Environmental Friendly State of the Art QA/QC Ideal for Design Build 31

32 Thank You 32

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