LittleWheels
Structural
- Nov 27, 2001
- 354
I have a project with 1500mm and 1800mm cast in situ piles. Long sacrificial liners driven through the seabed (soft silt), pulling up in weak rock, socket cut into hard rock. Some piles are being CAPWAPed (high strain dynamic test), more are being low strain integrity tested. It is the low strain integrity test that prompts this question.
There doesn't seem to be much consistency between national standards and guidance regarding maximum applicable pile diameters and lengths for the low strain test method. ASTM D5887 vs. ICE's Manual of Geotechnical Engineering vs. AS 2159 vs. IS 14893. Some limit pile lengths (these may vary depending on soil type) and some limit pile diameter for low strain integrity testing. I understand that excessively wide piles may not restrict wave direction to 1D (along the pile) but there doesn't seem to be much agreement as to what excessively wide actually is.
What is the current consensus regarding low strain integrity tests for cast in place piles and when alternative integrity methods should be adopted?
There doesn't seem to be much consistency between national standards and guidance regarding maximum applicable pile diameters and lengths for the low strain test method. ASTM D5887 vs. ICE's Manual of Geotechnical Engineering vs. AS 2159 vs. IS 14893. Some limit pile lengths (these may vary depending on soil type) and some limit pile diameter for low strain integrity testing. I understand that excessively wide piles may not restrict wave direction to 1D (along the pile) but there doesn't seem to be much agreement as to what excessively wide actually is.
What is the current consensus regarding low strain integrity tests for cast in place piles and when alternative integrity methods should be adopted?