Dynamic Pile Load Test (DLT) / Pile Driving Analyzer helps to evaluate the pile load capacity based on the force which is applied by the hammer. The methodology and instrument specification for DLT is defined in ASTM D4945 & IRC Standard recommends the dynamic pile load testing.
The pair of accelerometer and strain transducers are attached on pile diagonally at 1.5 times the diameter below the pile head. The Impact force causes the generation of the stress wave in the pile. The stress wave propagates in pile and gets reflected from the toe or where discontinuity confronted. The signal matching software is used along with the soil parameter to estimate the pile load capacity corresponding to the impact force which applied to the pile.