What is Pile Integrity?

A quick review of low strain impact tests for deep foundations, The IS code for pile integrity test is 14893

Pile integrity is the qualitative evaluation of the physical dimensions, continuity of a pile, and consistency of the pile materials.”

Why is Pile Integrity Test done?

It is important to pile test because defects can occur during the construction and installation of the pile and also as a pile ages voids and cracks necking and soil inclusion can all impact the integrity of pile structure. Therefore, it is important to find proper tools for effective quality control and quality assurance of the pile unlike beams and columns piles are buried underground with only the pile heads accessible. Therefore developing a test method to assess the quality and integrity from the pile head is important and very useful.

How to Evaluate Pile Integrity?

“The theory behind the low strain impact integrity test

Methods for Testing

Several different methods have been developed for evaluating integrity in a deep foundation in piles. The main ones can be seen below:

  1. Low Strain Impact Integrity TestASTM D 5882
  2. High Strain Dynamic TestingASTM D 4945
  3. Cross-hole Sonic LoggingASTM D 6760
  4. Parallel Seismic Method
  5. Thermal Integrity ProfileASTM D 7949

Low Strain Impact Integrity Test

The Sonic-Echo Method
Evaluate the integrity of the deep foundation. The low strain integrity test is a common non-destructive testing method for evaluating the quality and integrity of the pile

The Test in a Nutshell

.Evaluate integrity of deep foundation by “measuring and analysing the velocity response of the pile induced by an impact device usually applied axially and perpendicularly to the pile head surface.”

The low strain pile integrity test belongs to the family of shaft head impact tests, where the response of impacts made on a pile head is recorded by motion transducer and used for analysis the test involves measuring and analysing the velocity response of the pile induced by impact device applied to the pile head surface pile integrity test can be used to evaluate the integrity and consistency of pile materials. Determine the unknown length of the piles, shaft, and predict the changes in pile cross-section


  1. Evaluate the integrity and consistency of the pile materials
  2. Evaluate the unknown length of piles and shafts
  3. Evaluate pile cross-sectional area and length

Materials Needed

What tools are needed for testing?

  1. Motion Transducer (Velocity or acceleration sensor )
  2. Impact Source (Usually a hand-held hammer)
  3. Data Recording Unit

First, we need motion transducer this is typically an accelerometer or a geophone, the second is an impact source, which is usually a handheld hammer, lastly, we need a device for data acquisition recording analysis

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