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DMPe Borehole Dilatometer

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HIGH ACCCURACY DILATOMETER
MAY BE USED IN DEEP BOREHOLE
USER-FRIENDLY TABLET-OPERATED READOUT

The DMPe Borehole – or Flexible – Dilatometer is the electronic version of the DMP designed for determining in situ the modulus of deformation of rock masses

Description

The DMPe Dilatometer consists of a probe with a metal central body. The probe includes:

  • An inflatable membrane (rubber sleeve) equipped with three pairs of metallic inserts spaced at 120° intervals
  • A split spring-ring and double cone membrane retaining system
  • Three pairs of inductive displacement sensors with two measurement points each.
  • A pressure sensor allowing to measure pressure in the probe
  • A sediment collector

The probe is read with the D/P BOX Readout which is operated with an Android tablet. This versatile readout is compatible with other dilatometers / pressuremeters offered by the manufacturer. A special application installed on the tablet, allows configuring the tests and calibrations, to read and plot the test results in real-time, to log the data, and to review test results.

The dilatometer probe is designed to be lowered down into the borehole using a string of rods. Usually compressed dry gas (nitrogen or air) is used for pressurizing the probe.

The borehole dilatometer test consists in loading the ground in progressive steps and to measuring the diametrical deformation resulting from this loading.

The test is used for generating the following parameters:

  • A modulus of initial loading
  • Elastic moduli measured on cyclic loadings
  • A creep phase
  • The anisotropic behaviour of the rock mass
Specifications

DMPe Probe

 

Weight

45 kg

Diameter

95 mm (101-mm borehole)

Probe / Membrane  Length

1.8 m / 1 m

‘HR’ Membrane (standard)

For soft to hard rock

3 Inductives Displacement Sensors

Range

20 mm

Resolution (D/P BOX)

1  μm

Pressure Sensor

 

Max Working Presssure

20 000 kPa

Resolution (D/P BOX)

1 kPa

D/P BOX Readout

 

User Interface

Bluetooth communication with an Andoid tablet

Power Supply

2 x 12 V, 2.3 A, rechargeable batteries

Data Output Format

CSV, spreadsheet compatible

Dimensions

25 x 28 x 12 cm (l x w x h)

Housing

Splashproof, resistant ABS case

Autonomy

> 8 hours typically

Power supply interface

Universal AC wall plug with US/Euro adapter + adapter cable for car (lighter) & for external battery

Ordering Info

Please Specify:

  • Tubing & Cable Length (Special configuration required over 150 m)
  • Accessories

Optional Accessories

  • Spare Set of Displacement Sensors
  • Tools Kit for Assembling and Disassembling the Membrane
  • Carrying Box for the Dilatometer Probe
  • Flexible High Pressure Pneumatic Tubing with Connector
  • Electrical Cable
  • CRAELIUS 50 & 60 Type Connectors
  • Cable Reel
  • Pressure Regulator, Manometers & Valves
  • DP Box Readout Unit
  • Spare Membrane
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