Transmission And Substation Foundations - Technical Design Manual (TD06088E)

HIGH COMPRESSION STRENGTH WITH DRIVECAST™ PILES IN SOFT SOIL The following tables provide the nominal, LRFD design, and ASD allowable compression strengths of Drivecast piles with various diameter grout shafts in soft soils. The strengths listed are based on an unsupported length of 10 feet (3 meters) with either a fixed or pinned end condition at the pile head. The grout column diameters listed reflect the results in various soil conditions. In clay, the grout column is generally close to the diameter of the small plate on the displacement assembly. In sand, the grout column ranges between the small and large diameter plates on the displacement assembly. In loose sand fill, the grout column can exceed the diameter of the large plate on the displacement assembly. Each table includes the compression strengths of shafts without external grout for comparison.

Per the International Building Code(IBC) 2015 Section 1810.2.1, the depth to fixity of piles driven into soft ground can be considered fixed and laterally supported at 10 feet below ground surface.

Nominal, LRFD Design, and ASD Allowable Compression Strengths of Drivecast Piles, Type SS175 Central Shafts in Soft Soil 1,2,3

Nominal, LRFD Design, and ASD Allowable Compression Strengths kip (kN) Soft Soil Pinned Fixed

Grout Column Diameter

Nominal

Design

Allowable 15.4 (69.0)

Nominal

Design

Allowable 30.2 (135.3) 158.2 (709.0) 190.6 (854.3) 225.7 (1011.6) 263.6 (1181.5) 304.3 (1363.9)

No Grout

25.8 (155.6) 217.4 (974.4) 280.6 (1257.7) 350.2 (1569.6) 426.0 (1909.4) 507.9 (2276.5)

23.2 (103.9) 163.1 (731.0) 210.5 (943.5) 262.7 (1177.4) 319.5 (1432.0) 380.9 (1707.2)

50.5 (226.3)

45.4 (203.4)

8” OD 9” OD 10” OD 11” OD 12” OD

108.7 (487.2) 140.3 (628.8) 175.1 (784.8) 213.0 (954.7) 253.9 (1138.0)

316.5 (1418.6) 381.2 (1708.6) 451.4 (2023.2) 527.1 (2362.5) 608.6 (2727.8)

237.3 (1063.6) 285.9 (1281.4) 338.5 (1517.2) 395.3 (1771.8) 456.5 (2046.1)

Nominal, LRFD Design, and ASD Allowable Compression Strengths of Drivecast Piles, Type SS200 Central Shafts in Soft Soil 1,2,3

Nominal, LRFD Design, and ASD Allowable Compression Strengths kip (kN) Soft Soil Pinned Fixed

Grout Column Diameter

Nominal

Design

Allowable 26.2 (117.4) 131.1 (587.6) 164.4 (736.8) 200.7 (899.5) 239.9 (1075.2) 282.0 (1263.9) 327.0 (1465.6) 375.0 (1680.8) 425.9 (1908.9) 479.8 (2150.5)

Nominal

Design

Allowable 51.3 (229.9) 187.4 (839.9) 220.8 (989.6) 256.8 (1151.0) 295.5 (1324.4) 336.9 (1510.0) 381.2 (1708.6 428.4 (1920.1) 478.7 (2145.6) 532.0 (2384.5)

No Grout

43.7 (195.8)

39.3 (176.1) 196.6 (881.2) 246.6 (1105.3) 301.1 (1349.5) 359.9 (1613.1) 423.0 (1895.9) 490.5 (2198.5) 562.5 (2521.2) 638.8 (2863.2) 719.7 (3225.8)

85.6 (383.6)

77.1 (345.5)

8” OD 9” OD

262.2 (1175.2) 328.8 (1473.7)

374.8 (1679.9) 441.6 (1979.3) 513.6 (2302.0) 590.9 (2648.5) 673.8 (3020.1) 762.3 (3416.7) 856.8 (3840.3) 957.3 (4290.8) 1063.9 (4768.6)

281.1 (1259.9) 331.2 (1484.5) 385.2 (1726.5) 443.2 (1986.5) 505.3 (2264.8) 571.8 (2562.9) 642.6 (2880.2) 718.0 (3218.2) 798.0 (3576.8)

DRAWINGS AND RATINGS 10” OD 401.4 (1799.1)

11” OD 12” OD 13” OD 14” OD 15” OD 16” OD

479.8 (2150.5) 564.0 (2527.9) 654.1 (2931.8) 749.9 (3361.2) 851.8 (3817.9) 959.7 (4301.5)

For SI: 1 kip = 4.448 kN. 1 Refer to Section 4.1.3 of ESR-2794 for descriptions of fixed condition, pinned condition, soft soil.

2 Strength ratings are based on a design corrosion level of 50-years and presume the supported structure is braced in accordance with IBC Section 1808.2.5, and the lead section with which the extension is used will provide sufficient helix capacity to develop the full shaft capacity. 3 Column length to “fixity” of shaft in soil = 10 feet (3 meters)

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