Dynamic Load Testing & Pile Driving Analyzer

Dynamic Load Testing (DLT) is a quick method to evaluate the bearing capacity of a pile for loads similar to the design load. It can be used for prefabricated piles, cast-in-place concrete piles steel piles and wooden piles. DLT is considerably faster than static tests and at a fraction of the cost.

Pile Driving Analysis is a powerful tool to control the pile driving process. During driving, the performance of the hammer, the condition of the cushion, the behaviour of the pile, and the driving resistance of the soil can be analyzed and monitored.

Dynamic Load Testing (DLT) is a quick method to evaluate the bearing capacity of a pile for loads similar to the design load. It can be used for prefabricated piles, cast-in-place concrete piles steel piles and wooden piles. DLT is considerably faster than static tests and at a fraction of the cost.

To apply a load, an impact ram or a heavy mass (for instance a drop hammer) is dropped onto the prepared pile head. The generated compression wave travels down the pile and reflects upwards. This reflected wave contains information about the shaft friction, toe resistance and possible pile defects. The measured signals are processed and automatically stored by the Profound PDA/DLT monitoring system. The data can be easily retrieved for further review, graphical presentations or reporting.

To assess the static performance of a foundation pile with DLT, the dynamic pile resistance and the relationship between static and dynamic pile performance must be determined. If adequate load testing has been conducted on similar piles, it is possible to obtain satisfactory results without a comparative static test. In this case, the following procedure is normally used. During each impact loading, the following information is collected: compression and tension stress in the pile, transferred energy, driving resistance, shaft friction and toe resistance, bending moment, maximum acceleration, pile structural integrity and the extent and location of any damage. The signals and other information can be presented immediately on screen. A selection of the available graphs, all presented as a function of time and scaled in engineering units, include measured signals, Transferred energy, Acceleration, force, velocity and displacement at the sensor location, Force and velocity x impedance, Downward travelling waves, Upward travelling waves.

Pile Driving Analysis is a powerful tool to control the pile driving process. During driving, the performance of the hammer, the condition of the cushion, the behaviour of the pile, and the driving resistance of the soil can be analyzed and monitored.

The additional knowledge obtained by performed PDA can pay for itself many times over by: Reducing the risk of damage to the pile or hammer. Reducing the risk of damage to the superstructure caused by failure of the foundation. Optimization of the final depth of driving, which may result in a shorter pile length. Facilitating the prediction of pile driving and selection of the correct hammer for future projects. A quality record of each pile can be supplied to clients and authorities.

The Profound PDA/DLT-system fully complies with ASTM D4945-12. The system consists of a PDA-USB signal conditioner, a 4 channel junction box with a 50m cable reel, Windows PC software for data acquisition and reporting, 2 sets of combined strain and acceleration sensors and a set of mounting accessories. The PDA-USB conditioner is connected to a Windows OS XP/Vista or WIN7 laptop. Depending on the usage frequency and measurement purpose, you can use a suitable sturdy Windows field laptop to combine with the PDA-USB conditioner. Profound can assist you with the optimum choice. The complete package makes it possible to carry out PDA or DLT tests. In case you want to determine pile (ultimate) capacity and load displacement behaviour we advise to include the program DLTWAVE for signal matching.

 

Profound, Netherlands

Profound, Netherlands

Profound develops and manufactures innovative and high quality Pile Testing Equipment and Geotechnical Monitoring Systems for professional use. Ranging from inventive pile testing methods to innovative geotechnical monitoring equipment, Profound, continuously strives to make the best technology available to the end user.

 

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