I am now making review of some PDA tests for 305x305x180kg/m grade 55 steel H-piles. The pile length is about 35m with general geology consisting of fill (8m, gravelly to sandy), alluvium (4m, sandy), grade V weathered soil (sandy)
From the PDA (PAK model) records of 5 piles, it was recorded that the transferred energy ratio (EMX/PE) are about 120% . The testing contractor claimed that such abnormal readings are "due to additional acceleration applied to the hammer ram after rebound". I would like to seek the opinions from any experienced partitioner. Thank you very much!