CAPACITY LOAD OF PILE FOUNDATION

By M Firdaus, MT

www.dauspoli.co.cchttp://dauspoli.host56.com

Axial bearing capacity of pile based on how the pile supporting the load, divided by 2 kinds of :

1. End bearing pile

2. Friction pile

CAPACITY ANALYSIS OF THE SINGLE PILE

• Based on the driving formula• Based on SPT Test• Based on Cone Penetration Test• Based on soil test results (UDS)

SAFETY FACTOR

• To provide security against the uncertainty calculation method used

• To provide security against variations shear strength and compressibility of the soil

• To ensure that materials reasonably safe pillar in supporting the work load

• To ensure that the total reduction that occurred at the pile is still within the limits of tolerance

• To ensure that the decline was not uniform among the pillars are still within the limits of tolerance

Selection of the factor of safety considering the factors :

a) The type and importance of structureb) Variability of soil (not uniform)c) Accuracy of soil investigationd) The type and amount of soil tests conductede) The availability of data in place (pile load test)f) Supervision / quality control in the fieldg) The possibility of actual expenses incurred during

the design service load structure

The recommended safety factor table :

Classification structure

Safety Factor (SF)

Good control Normal Controls

Worst Control Very worst Control

Monumental

Permanen

sementara

2,3

2

1,4

3

2,5

2

3,5

2,8

2,3

4

3,4

2,8

5,2

QQ ua

5,1

Q

3

QQ sba

a) Pile driven b) Bored Pile

5,2

QQ ua

2

QQ ua

•Magnification of the basic pillars ø< 2m :

•Pile without magnification :