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DMPe Borehole Dilatometer

Category: Geotechnical & Civil Engineering Instrumentats

HIGH ACCCURACY DILATOMETER
COMPATIBLE WITH DEEP BOREHOLE
USER-FRIENDLY TABLET-OPERATED READOUT

The DMPe Borehole – or Flexible – Dilatometer equipment is designed for the in situ determination of the deformation modulus of rock masses in 96 mm or 101 mm boreholes

 

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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 (see datasheet D/P BOX for more details). A dedicated application, allows configuring the tests and calibrations, displaying and plotting the test results in real-time, logging the data.

 

The dilatometer probe is designed to be lowered down into the borehole using a string of rods. Nitrogen compressed dry gas is used for pressurizing the probe.

 

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

 

The test is used for generating the following parameters:

  •     A modulus of global deformation
  •     Elastic modulus measured on cyclic loadings
  •     Creep parameters
  •     Anisotropy of the rock mass

 

Specifications

 

  DMPe Probe

                                                                    
  Weight   45 kg
  Diameter

  90 mm (96-mm borehole)

  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                                                                                                
  Calibrated Range   20 mm
  Resolution (D/P BOX)   1  μm

 

 

  Pressure Sensor                                                                
  Max Working Presssure   20 000 kPa
  Resolution (D/P BOX)   1 0  kPa

 

 

  D/P BOX Readout  
  User Interface   Bluetooth communication with an Android 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:

  •     DMPe design, 90 or 95
  •     Tubing & Cable Length (Special configuration required over 150 m)
  •     Accessories

 

Accessories

  •     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 90 or 95

 

Optional Accessories

  •     Spare Set of Displacement Sensors
  •     Tools Kit for Assembling and Disassembling the Membrane
  •     Carrying Box for the Dilatometer Probe
  •     Kit to transform DMPe 90 into DMPe 95
  •     Kit to transform DMPe 95 into DMPe 90