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High Strain Dynamic Pile Testing


High Strain Dynamic Testing (ASTM D4945)

High Strain Dynamic Testing (HSDPT) consists of estimating soil resistance and its distribution from Force and Velocity measurements obtained near the top of a foundation impacted by a Hammer or Drop Weight. The impact produces a compressive wave that travels down the shaft of the foundation. A pair of Strain Transducers obtains the signals necessary to compute force, while measurements from a pair of Accelerometers are integrated to yield velocity. These sensors are connected to an instrument (such as a pile driving analyzer), that records, processes and displays data and result.

  • Provides information on Friction, End-Bearing, Pile Integrity, Hammer Performance and Plot Simulated Load Test Curve for comparison with static testing
  • Instant preliminary results on site
  • Feedback on maximum tension and compression forces
  • Pile Integrity- Location and extent of damage
  • Mobilized Static Load capacity based on CASE method
  • Confirm the geotechnical capacity of the pile
  • Testing is conducted in a quick and non- destructive manner
  • Cost effective
  • Applicable for both Offshore & Onshore piling
  • Static load tests are expensive and time consuming where as with PDA many more piles can be tested at much lower cost and speed
  • HSDPT simply requires a drop weight to impact the shaft
  • PDA is the answer for projects where Static Testing is prohibitively expensive or physically impossible

We have executed hundreds of High Strain Dynamic Pile Tests across Pakistan and have extensive onshore & offshore experience which enables us to provide quality services

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CAPWAP (Case Pile Wave Analysis Program)

GeoScience Pile Test renders CAPWAP Analysis services from GRL Inc. USA services.

CAPWAP (Case Pile Wave Analysis Program) is a rigorous numerical analysis, which models the pile and soil behaviour that allows full and accurate analysis of PDA field data. It involves applying the measured pile top force and velocity-time as a boundary condition to a wave equation model of the pile. Pile capacity predictions obtained by CAPWAP have been extensively compared with static load tests, with excellent agreement between the two. This unequaled wealth of comparative data gives you confidence in CAPWAP results.

The output result provides:

  • Total pile bearing capacity
  • Dynamic soil response
  • Simulated static load vs. pile top and toe movement
  • Soil resistance distribution
  • Dynamic forces and stresses along the shaft
  • Damping and quake along shaft and at toe
  • Measured and computed forces and velocities
  • Maxima of displacement, velocity and transferred energy along the pile
  • Optionally residual forces in pile and soil
  • Comprehensive report including soil profile and driving log

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