Load Test / Pile Dynamic Analysis
Historically "Load Tests" were utilized to determine the bearing capacity of a "test" pile. Load testing involved a siginficant amount of effort and time. Technology has improved this process with a program called Pile Dynamic Analysis (PDA).
A probe is placed into a hole driven into the top of the pile prior to installation. As the hammer hits the pile the probe gathers and reports data to the linked computer. This information allows the engineer or geotechnical personnel on site to determine actual bearing capacity at varying depths, determine the intergrity of the pile and monitor the performance of the hammer being used. Te data is quickly transferred into the pile lengths needed for the project to achieve the design capacity.
Seismographic or vibration monitoring is used to determine the vibration levels on surrounding structures. Vibrations are measured in peak partical velocity (PPV). Predetermined threholds levels are monitored to ensure no damage occurs to adjacent properties during pile driving operations.
This process involves a Geotchnical Engineer or Technician on site during pile driving operations. This person monitors the amount of times the hammer hits each pile and records the bearing capacity or tonnage bearing of each and every pile on the project.
The report presented after each project is called a Pile Certification Report.