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calculation of pile capacity for friction pile
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BRIDGE No. - 68 BORE HOLE LOCATION - ABUTMENT A1
PILE PARAMETERS
Diameter of Pile = 1.200 m Cut off Level OF Pile = 2.005 m
Length of Pile = 19.936 m RL Ground Water Table Considered = 1.955 m
Area of Pile Toe = π x 1.2^2 / 4.0 = 1.131 m2
Length of Effective Overburden Pressure = 16.613 Times Diameter of Pile
= 19.936 m
SOIL PARAMETER
From To Nq Nγ
1 1.955 -5.506 7.461 2.048 1.000 6 2 0.35 0.50 2 1.50 0 0
2 -5.506 -11.506 6.000 2.048 1.000 >12 0 0.35 0.30 0 1.50 0 0
3 -11.506 -17.981 6.475 2.048 1.000 21.6 24 0 0.30 24 1.50 10 9.782
DETERMINATION OF PILE CAPACITY AS PER STATIC FORMULA (IS:2911 PART-I/SEC2)
PILES IN GARNULAR SOIL Q = Ap (1/2 D γ Nr + PD Nq) + ∑ K Pdi tanδ Asi
Q = Ap Nc Cp + α C As
Pr at Top
(T/m2)
Pr at
Bottom
(T/m2)
Average
Pressure
Pdi (T/m2)
Surface
Area of
Pile
As (m2)
Resistance
(T)
1 7.461 0.000 7.819 3.910 28.127 5.760 49.223 54.983 54.983
2 6.000 7.819 14.107 10.963 22.619 0.000 23.750 23.750 78.733
3 6.475 14.107 20.893 17.500 24.410 285.288 0.000 285.288 364.022 243.250
Total 19.936
Total Ultminate Load Carrying Capacity of Pile = 364.022 + 243.25 = 607.272 T
Factor of Safety = 2.5
Safe Working Load on Pile = 607.272 / 2.5 = 242.91 T
Bearing Capacity Factors
DETERMINATION OF LOAD CARRYING CAPACITY OF PILE
PILES IN COHESIVE SOIL
End Bearing
Resistance
due to
Cohesive Soil
(T)
Layer Total
(T)
Cumulative Granular Cohesive
Soil
Layer
No
Depth of
Layer (m)
Frictional Resistance
Granular Soil
Soil
Classification
Angle of
Internal
Friction
φ
Average
Cohesion of
Layer Cu
(kg/cm2)
Coefficient
of Earth
Pressure K
Angle of
Wall
Friction
δ
Reduction
Factor
α
Soil
Layer
No.
Extension of Soil Layer Length of
Layer (m)
Bulk
Density
(T/m3)
Water
Density
(T/m3)
Average
Value of N'
of Layer
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