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GRL Services About GRL Branch Offices Careers |
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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 that impacts the top of the foundation and causes it to experience a small permanent set. Prior to the test, GRL recommends an adequate hammer or drop weight. If neither is available, GRL supplies the APPLE dynamic loading system. The APPLE can activate up to 4000 tons of test load, making it a great low cost alternative to static testing of large diameter drilled shafts. |
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Accelerometers and strain transducers attached to the foundation measure force and velocity as the drop weight hits it. Instead of strain transducers, GRL may also use a Load Cell, which speeds up the test and in certain cases may yield more accurate force measurements. GRL analyzes data in real time with the Pile Driving Analyzer® (PDA). Data 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 D4945-08 Standard Test Method for High-Strain Dynamic Testing of Piles. GRL may also design the test to meet the requirements of the Rapid Load Test standard ASTM D7383 provided an adequate ram is available. |
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