1 MISCELLANEOUS Pile driving formulae To develop the desired load carrying capacity, a point bearing driven pile must penetrate sufficiently into a dense.

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Presentation transcript:

1 MISCELLANEOUS Pile driving formulae To develop the desired load carrying capacity, a point bearing driven pile must penetrate sufficiently into a dense soil layer or havesufficient contact with a layer of rock. This requirement cannot always be satisfied by driving a pile to a pre-determined depth, because soil profiles vary. For that reason several formulae have been developed to calculate the ultimate capacity of the pile during driving.

2 MISCELLANEOUS They are based on Energy Approach and are independent of the soil into which pile is driven. Some of the formulae are given below. The reader is requested to go through literature suggested in references at the end. The famous of these formulae is Engineer’s news ( EN) record formula. The modified form of this formula is presented below Qu= (E WR h)*(WR+ n2WP) / ( S+C)*(WR+WP)

3 MISCELLANEOUS Where, Qu= Ultimate capacity of the pile WR= Weight of the ram h= height of fall of the ram Wp= Weight of the pile C= a constant S=Penetration of pile per hammer blow n= Coefficient of restitution between ram and pile cap E= Efficiency of the hammer

4 MISCELLANEOUS Pile Cap Configrations

5 MISCELLANEOUS Pile cap configurations

6 Structural Design of Pile and Pile cap Structurally the pile section is designed as column for Compression plus Bending Tension plus bending The pile cap is designed as rigid or flexible. A rigid ( very high flexural strength between two adjacent piles) pile cap is designed for one way shear and punching shear. A flexible ( average flexural strength between piles) pile cap is analyzed by FEM by considering the piles as vertical springs and then designed for the stresses obtained from the analysis

7 Flow chart for pile selection

8 Structural Design of Pile and Pile cap Thank You