7/29/2019 Vertical Capacity of Pile

1/4

(AS per IRC 78 Cl. 709 Amendment)

Qu = Re + Ref

= Ksp*qc*df*Ab + As*Cus

Ksp (Emperical co-eff. Based on (CR+RQD)/2 = 0.583

CR (core recovery in %) = 62 % 30 %

RQD ( Rock quality designation ) = 42 % 100 %

qc (Avg. UCS of rock core ) = 40.00 Mpa

ls Length of socket = 2.5 m

d dia of socket = pile dia = 1 m

df (depth factor = 1+0.4*(ls/d)

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2/4

Based on Clause 6.5.1.1 IS 14593

Safe load capacity of pile in tonnes,

Qs = +

qc (Avg. UCS of rock core) = 40 Mpa

Nd (Depth factor =0.8+0.2*(ls/d)

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0.3

1.2

/cm2=100

)

Ksp

7/29/2019 Vertical Capacity of Pile

4/4

1 to 2

3 to 4

Min. ls (

xD )

2 to 3