Dynamic formula have been developed on the basis of this principle, considering additional factors such as:
1. Elastic compression of the pile.
2. Additional pressure used for driving the pile as in the case of a double-acting steam hammer.
As the input energy is used to estimate the load capacity based on the penetration of the pile per blow, the loss of energy in applying each blow should be subtracted from the total input energy of Eq. (20.23). Otherwise, dynamic formula would overestimate the load capacity. The loss of energy in each blow can be due to the inefficient hammer or hammer blow. Also, only that part of input energy which causes penetration of the pile should be used to estimate the load capacity. For example, part of the input energy used for elastic compression of the pile should be deducted before equating it to the work done.
Types of Dynamic Formula:
The following are some important dynamic formulae:
1. Engineering News formula.
2. Hiley’s formula.
3. Danish formula.
Danish Formula
The Danish pile-driving formula is a formula which enables one to have a good gauge of the bearing capacity of a driven pile.
The formula was constructed by the Danish civil engineer Andreas Knudsen in 1955. It was made as a part of his final project at The Technical University of Denmark and was published for the Geotechnics Congress in London in 1956. Later it became part of the Danish Code of Practice for Foundation Engineering and was named.
2. http://www.soilmanagementindia.com/pile-foundations/load-capacity-of-piles/how-to-estimate-the-load-capacity-of-piles-formulae-soil-engineering/14272
Download Danish Formula Spreadsheet
Download Pile Driven Record
Thank you
1. Elastic compression of the pile.
2. Additional pressure used for driving the pile as in the case of a double-acting steam hammer.
As the input energy is used to estimate the load capacity based on the penetration of the pile per blow, the loss of energy in applying each blow should be subtracted from the total input energy of Eq. (20.23). Otherwise, dynamic formula would overestimate the load capacity. The loss of energy in each blow can be due to the inefficient hammer or hammer blow. Also, only that part of input energy which causes penetration of the pile should be used to estimate the load capacity. For example, part of the input energy used for elastic compression of the pile should be deducted before equating it to the work done.
Types of Dynamic Formula:
The following are some important dynamic formulae:
1. Engineering News formula.
2. Hiley’s formula.
3. Danish formula.
Danish Formula
The Danish pile-driving formula is a formula which enables one to have a good gauge of the bearing capacity of a driven pile.
The formula was constructed by the Danish civil engineer Andreas Knudsen in 1955. It was made as a part of his final project at The Technical University of Denmark and was published for the Geotechnics Congress in London in 1956. Later it became part of the Danish Code of Practice for Foundation Engineering and was named.
Pic : Danish Formula
Source:
1. https://en.wikipedia.org/wiki/Danish_pile-driving_formula2. http://www.soilmanagementindia.com/pile-foundations/load-capacity-of-piles/how-to-estimate-the-load-capacity-of-piles-formulae-soil-engineering/14272
Download Pile Driven Record
Thank you
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