DESIGN CALCULATION FOR PILE LENGTH USING MEYERHOFF FORMULAE

DESIGN CALCULATION FOR PILE LENGTH USING MEYERHOFF FORMULAE Project :

Borehole No.

- TYPE YOUR OWN PROJECT -

ITEM NO. Do P1 UD1 P2 UD2 P3 UD3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15 P16 P17 P18 P19 P20 P21 P2 2 P23 P24 P25 P26 P2 7 P2 8 P2 9 P3 0 P3 1

SOIL LAYER DISCRIPTIONS CUT OFF LEVEL Very Soft Dark Greyish SILT Clay Very Soft Dark Greyish SILT Clay Very Soft Light Greyish SILT Clay Very Soft Light Greyish SILT Clay Very Soft Light Greyish SILT Clay Very Soft Light Greyish SILT Clay Very Soft Light Greyish SILT Clay Very Soft Light Greyish SILT Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Very Soft Light Yellowish SILTY Clay MARINE Clay Medium Dense Light Greyish fine to Medium SAND Medium Dense Light Greyish fine to Medium SAND Medium Dense Light Greyish fine to Medium SAND Medium Dense Light Greyish Whitish fine to Medium SAND Medium Dense Light Greyish Whitish fine to Medium SAND Medium Dense Light Greyish Whitish fine to Medium SAND Medium Dense Light Greyish Whitish fine to Medium SAND

Stiff Light Greyish SILT Clay Medium Dense Light Greyish Whitish fine to Medium SAND Medium Dense Light Greyish Whitish fine to Medium SAND Medium Dense Light Greyish Whitish fine to Medium SAND Medium Dense Light Greyish Whitish fine to Medium SAND

Medium Medium Medium Medium Medium

Dense Dense Dense Dense Dense

Light Light Light Light Light

Greyish fine Greyish fine Greyish fine Greyish fine Greyish fine

to to to to to

m edium m edium m edium m edium m edium

SAND SAND SAND SAND SAND

DEPTH (M) EFFECTIVE FROM TO DEPTH (M) 0 .0 0 1 .5 0 1.50 1 .5 0 3.00 1.50 3.00 4 .5 0 1.50 4 .5 0 6 .0 0 1.50 6.00 7 .5 0 1.50 7 .5 0 9 .0 0 1.50 9.00 10.50 1.50 10.50 12.00 1.50 12.00 13.50 1.50 13.50 15.00 1.50 15.00 16.50 1.50 16.50 18.00 1.50 18.00 19.50 1.50 19.50 21.00 1.50 21.00 22.50 1.50 22.50 24.00 1.50 24.00 25.50 1.50 25.50 27.00 1.50 27.00 28.50 1.50 28.50 30.00 1.50 30.00 31.50 1.50 31.50 33.00 1.50 33.00 34.50 1.50 34.50 36.00 1.50 36.00 37.50 1.50 37.50 39.00 1.50 39.00 40.50 1.50 40.50 42.00 1.50 42.00 43.50 1.50 43.50 45.00 1.50 45.00 46.50 1.50 46.50 48.00 1.50 48.00 49.50 1.50 49.50 51.00 1.50 51.00 52.50 1.50

INPUT DATA : Diameter of spun pile, D  Area of spun pile Perimeter of spun pile Concrete Grade, fcu Design Working Capasity S.I. Borehole Reference no.

= = = = = =

0.35 0.0962 1.0997 30.00 600.00 BH-1

Date

:

Designed by

:

Checked by

:

SPT VALUES N N' 0 0 0 0 0 0 0 0 1 2 2 3 4 3 4 5 5 9 9 11 15 17 16 17 12 21 22 21 25 24 23 23 24 23

:

0 0 0 0 0 0 0.0 0.0 0.5 1.5 2.0 2.5 3.5 3.5 3.5 4.5 5.0 7.0 9.0 10.0 13.0 16.0 16.5 16.5 14.5 16.5 21.5 21.5 23.0 24.5 23.5 23.0 23.5 23.5

m m2 m N/m m 2 kN

BH-1

(KN)

Qs (KN)

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.40 4.21 5.61 7.01 9.81 9.81 9.81 14.85 16.50 23.09 29.69 32.99 42.89 52.79 46.27 54.44 47.84 54.44 70.93 70.93 75.88 80.83 77.53 75.88 77.53 77.53

Ks Kb

qs

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.40 5.61 11.22 18.23 28.04 37.86 47.67 62.52 79.01 102.11 131.80 164.79 207.68 260.46 306.73 361.17 409.01 463.44 534.37 605.30 681.18 762.01 839.54 915.42 992.95 1070.48

Qb (KN) N.A. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 24.06 48.11 48.11 72.17 96.22 72.17 96.22 192.45 192.45 346.41 346.41 423.38 577.34 654.32 384.90 654.32 461.87 808.28 846.77 808.28 962.24 923.75 885.26 885.26 923.75 885.26

Qu (KN) N.A. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 25.46 53.72 59.33 90.40 124.27 110.02 143.90 254.97 271.46 448.51 478.20 588.17 785.02 914.79 691.63 1015.49 870.88 1271.72 1381.14 1413.58 1643.42 1685.76 1724.80 1800.68 1916.69 1955.73

SAND 2.0 400

SILT 1 .7 250

CLAY 3.0 200

MODIFIED MEYERHOF FORMULAE : where

N = average SPT-N value Ks = skin friction empirical factor 

QU = cumulative [ Ks X N' X (D X 3.142 X Le) ] + Kb N ( D2 X 3.142 ) 4

Kb = end bearing empirical factor  D = diameter of bored pile (m) L = pile length (m )

OUTPUT : Shaft Frictional Resistance, Qs (kN) End Bearing, Qb (kN) Ultimate Bearing Capacity, Qu (kN) Working Load, Pw (kN) Overall Factor of Safety, F.O.S. Recommend ed pile length, L (m) Bored Length from G.L. (m)

= = = = = = =

605.30 808.28 1413.58 600.00 2.36 43.50 -

OVERALL F.O.S. N.A. 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.09 0.10 0.15 0.21 0.18 0.24 0.42 0.45 0.75 0.80 0.98 1.31 1.52 1.15 1.69 1.45 2.12 2.30 2.36 2.74 2.81 2.87 3.00 3.19 3.26