DMP^e Borehole Dilatometer

Description

The DMP^e 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