Dynamic Load Testing is a fast, reliable and cost effective method of assessing foundation bearing capacity. GRL performs Dynamic Load Testing on driven piles, drilled shafts and other cast in place foundations, and usually conducts several tests in one single day.

In addition to bearing capacity, Dynamic Load Testing gives information on resistance distribution (shaft resistance and end bearing) and evaluates the shape and integrity of the foundation element.

The Dynamic Load Test involves a substantial ram mass (e.g. a pile driver) that impacts the top of the foundation and causes it to experience at least a small permanent set. Accelerometers and strain transducers attached to the foundation measure force and velocity as the drop weight hits it. GRL analyzes the measurements in real time using the Pile Driving Analyzer^® (PDA). Data acquired in the field is further analyzed with the CAPWAP^® software. GRL engineers furnish a detailed report for each Dynamic Load testing project that includes a simulated static load test in the form of a calculated load-test curve.

GRL performs Dynamic Load Tests in accordance with ASTM D4945-00 Standard Test Method for High-Strain Dynamic Testing of Piles.