Lecture 17 - DF19 Static Pile Capacity Based on Penetration...

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DF19 Static Pile Capacity Based on Penetration Resistance: o Potentially superior to static analyses because of actual field (insitu) observation o Penetration resistance (blow count) depends on parameters of hammer-pile-soil system o Hammer considerations include type, rated energy, condition, cushions, etc. (schematics and hammer specifications from Das, 1995) Single-Acting Diesel Hammer Drop Hammer Double-Acting Air/Steam Hammer Single-Acting Air/Steam Hammer
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DF20 Partial List of Typical Air and Steam Hammers (from Das) Rated Energy Ram Weight Maker of Hammer Model No. Type of Hammer kip-ft kN-m Blows per min. kips kN V 3100 Single acting 300 406.8 58 100 448.8 V 540 Single acting 200 271.2 48 40.9 181.9 V 060 Single acting 180 244.1 62 60 266.9 MKT OS-60 Single acting 180 244.1 55 60 266.9 V 040 Single acting 120 162.7 60 40 177.9 V 400C Differential 113.5 153.9 100 40 177.9 R 8/0 Single acting 81.25 110.2 35 25 111.2 MKT S-20 Single acting 60 81.4 60 20 89 R 5/0 Single acting 56.9 77.2 44 17.5 77.8 V 200-C Differential 50.2 68.1 98 20 89 R 150-C Differential 48.75 66.1 95-105 15 66.7 MKT S-14 Single acting 37.5 50.9 60 14 62.3 V 140C Differential 36 48.8 103 14 62.3 V 08 Single acting 26 35.3 50 8 35.6 MKT S-8 Single acting 26 35.3 55 8 35.6 MKT 11B3 Double acting 19.2 26.1 95 5 22.2 MKT C-5 Double acting 16 21.7 110 5 22.2 V 30-C Double acting 7.3 9.9 133 3 13.3 V = Vulcan Iron Works, FL MKT = McKiernan-Terry, NJ R = Raymond International, Inc. TX Partial List of Typical Diesel Hammers (from Das) Rated Energy Piston Weight Maker of Hammer Model No. kip-ft kN-m Blows per min. kips kN K K150 280 379.7 45-60 147.2 33.1 M MB70 141-63.4 191.2-86 38-60 70.5 15.84 K K-60 105.6 143.2 42-60 58.7 13.2 K K-45 91.1 123.5 39-60 44.0 9.9 M M-43 84-37.8 113.9-51.3 40-60 42.1 9.46 K K-35 70.8 96 39-60 34.3 7.7 MKT DE70B 63-42 85.4-57 40-50 31.1 7.0 K K-25 50.7 68.8 39-60 24.5 5.51 V N-46 32.55 44.1 50-60 17.6 3.96 L 520 26.3 35.7 80-84 22.6 5.07 M M-14S 26-11.88 35.3-16.1 42-60 13.2 2.97 V N-33 24.6 33.4 50-60 13.3 3 L 440 18.2 24.7 86-90 17.8 4 MKT DE-20 18-12 24.4-16.3 40-50 8.9 2 MKT DE-10 8.8 11.9 40-50 4.9 1.1 L 180 8.1 11 90-95 7.7 1.73 V = Vulcan Iron Works, FL K = Kobe Diesel M = Mitsubishi International Corp. L = Linkbelt, IA MKT = McKiernan-Terry, NJ
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DF21 Pile Driving Formulae (from Das, 1995) For drop hammers: C = 0.1 inch (if the units of S and h are in inches) For steam hammers: C = 1.0 inch (if the units of S and h are in inches)
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DF22 Hammer Type Efficiency, E Single and double-acting hammers 0.70-0.85 Diesel hammers 0.80-0.90 Drop hammers 0.70-0.90 Pile Material Coefficient of restitution, n Cast iron hammer and concrete 0.40-0.50 piles (without cap) Wood cushion on steel piles 0.30-0.40 Wooden Piles 0.25-0.30
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DF23
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DF24 Pile Driving Formulae Example (from Das, 1995)
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DF25 How a Pile is "Driven" o the pile penetrates the soil as the kinetic energy of the moving ram is transferred to it (conservation of energy – but many losses: esp. friction and heat)
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This note was uploaded on 09/12/2011 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 17 - DF19 Static Pile Capacity Based on Penetration...

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