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Pile On Sand

The document details the calculations for the ultimate capacity of piles, including the contributions from shaft resistance (Qs) and base resistance (Qb). It provides specific parameters such as pile diameter, SPT values, and safety factors, leading to calculated ultimate capacities and allowable loads in both compression and tension. The results indicate allowable loads of 361 tonnes in compression and 334 tonnes in tension for a pile with a diameter of 1.2 meters.

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15 views1 page

Pile On Sand

The document details the calculations for the ultimate capacity of piles, including the contributions from shaft resistance (Qs) and base resistance (Qb). It provides specific parameters such as pile diameter, SPT values, and safety factors, leading to calculated ultimate capacities and allowable loads in both compression and tension. The results indicate allowable loads of 361 tonnes in compression and 334 tonnes in tension for a pile with a diameter of 1.2 meters.

Uploaded by

w5zxk577dy
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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PILE ON SAND -TOMLINSON 6th Edition Page(266 to 270)

Ultimate capacity of pile Qu=Qs+Qb


Qs= Σ qs As
qs = Ksσv'tan δ
Qb = Nqσv'Ab
Diameter of Pile 1.2 1.5 2.15
SPT (N.avg) 50 50 50
ø (Angle og friction) 41 41 41
Nq(Bearing Capacity Factor conservatevely used 20) 20 20 20
Water LEVEL from E.G.S 15 15 15
Total length of Pile (Assumed) 25 25 25
Length of pile below cutoff level 24 24 24
Length of Pile from dense Sand (SL) 17.5 17.5 17.5
Unit weight of water (U.wt) 1 1 1
Unit weight of Sand (U.sd) 1.8 1.8 1.8
Assumed Cut off level (m) 1 1 1
Water level below cut off level 14 14 14
Reduecd length below the water table (l) 10 10 10
σVo (Overburden pressure)(ton/m2) 33.2 33.20 33.2
Ab (area of pile base) 1.13 1.766 3.63
Radient to degree conversion 0.72 0.72 0.72
Ks = 0.35 0.350 0.35
tanᵟ = tanø 0.87 0.869 0.87
(AS) Area of shaft 65.94 82.425 118.14
Saftey Factor (Compression) 3.00 3.00 3.00
Saftey Factor (Tension) 2.50 2.50 2.50
Qu 1083.62 1589.08 3006.12
Weight of pile (ton) 67.82 105.98 217.72
Total allowable load in Compression in Tonn 361 530 1002
Total allowable load in Tension Tonn 334 439 695

Ultimate capacity of pile Qu=Qs+Qb


Qs= Ksσv'tan δ * As
Qs =0.35*33.2*0.87*65.94 = 666.6
Qb = Nqσv'Ab
Qb =20*33.2*1.13 =750.3
Qu=(0.5*666.6)+750.3 =1083
Qallowable Compression=Qu/FS = 1083/3 =361 Tonnes
Qallowable Tension= (Qs/Fs)+Wp
Qallowable Tension= (666.6/2.5)+67.8 = 334 Tonnes

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