ISO DIS 22477-4

Description / Abstract: This international standard establishes the specifications for the execution of dynamic pile load tests in which a single pile is subject to an axial dynamic load in compression.

This standard outlines the methods of testing required to allow assessment of pile resistance to be determined from the following methods and procedures:

a) Dynamic impact testing – determination of pile resistance by evaluation of measurements of strain and acceleration and or displacement at the pile head with respect to time

b) Pile driving formulae - evaluation of pile resistance from blow counts and hammer energy during pile driving

c) Wave equation analysis - evaluation of pile resistance from blow counts by modelling of the pile, soil and driving equipment

The provisions of this international standard apply to piles loaded axially in compression.

All pile types mentioned in EN 1536, EN 12699 and EN 14199 are covered by this international standard.

The tests considered in this international standard are limited to dynamic pile load tests only.

NOTE 1 ISO 22477-4 can be used in conjunction w ith EN 1997-1. Numerical values of partial factors for limit states f rom pile load tests to be taken into account in design are provided in EN 1997-1. For design to EN 1997-1 the results f rom dynamic load pile testing w ill be considered equivalent to the measured compressive resistance Rc,m af ter being subject to appropriate analysis.

NOTE 2 Guidance on analysis procedures for dynamic pile load testing results is given in the informative Annexes.

This international standard provides specifications for:

i) investigation tests, whereby a sacrificial pile is loaded up to ultimate limit state;

ii) control tests, whereby the pile is loaded up to a specified load in excess of the serviceability limit state.

NOTE Generally, an investigation test focuses on general know ledge of a pile type; a control test focuses on one specif ic application of a pile.