DDP36 Probe

“The Mini probe“

New 2D in situ rock stress measurement tool

The DDP36 Probe offers a cutting-edge solution for measuring in situ rock stress using a reliable, two-dimensional overcoring method by recording deformations released around a circular installation hole. It builds upon the principles of the renowned USBM gauge, offering additional features for improved precision and ease of use.

The DDP36 probe was born as an alternative to Hydraulic Fracturing, improving times, cost and reliability of the process, as well as an alternative to strain gauge soft cells that require gluing and long waiting periods.

  • Designed to measure horizontal principal stress magnitudes and orientations in nearly vertical boreholes.
  • Quick operation.
    • In combination with wire-line system, the DDP36 probe provides a fast and synergistic process between drilling, installation, measurement, overcoring and retrieval.
    • Measures four diametric convergences with eight sensors.
    • Monitors temperature of overcored rock cylinder.
    • Self-orientated; 3D -gyro, -accelerometer & –magnetometer.
    • Mechanical mounting, no glue required.
    • Elastic parameters of the rock are obtained immediately after the measurement via biaxial testing.
    • The in situ stress state can be accurately back-calculated once obtained the elastic
      parameters.
  • Accuracy: Precise data collection ensured by pin measurement accuracy and repeatability better than 2 μm..
  • Highly tested…
    • In the laboratory testing in aluminum and granite blocks.
    • In the field tested on depths up to 500m.

Key features

Increased reliability.

By measuring four diametric deformations.

Advanced sensor integration.

Precise tools take into consideration installation orientation, rock temperature and water pressure during the measurement process

Superior pin configuration.

Orientation and distance between the pins enhances accuracy of the diametric deformation measurements.

Data integrity & calibration.

Corrective calibration applied before and after the measurements assessments.

Applications

The DDP36 probe is ideal for any geotechnical project where the need for quick and reliable rock stress measurements exists.

The probe has been designed bearing in mind specially deep projects, such as geological explorations, or infrastructure projects in challenging environments.

  • Greenfield and brownfield projects
  • Deep geological investigations from surface or underground excavations
  • Tunneling
  • Underground heat storage
  • Hydro-power plants
  • Nuclear waste repositories

Fast and reliable rock stress measurements

Get in contact with us to learn more about how the DDP36 probe we can be of aid in your next project. Mining development, mineral exploration, underground infrastructure design, foundations, etc; the Miniprobe is suitable for any type of deep geotechnical investigation project.

Contact us

Image gallery

Snapshots of the measurement process