www.smartec.ch The DMP e Borehole - or Flexible - Dilatometer is the electronic version of the DMP designed for determining in situ the modulus of deformation of rock masses Electronic version of the DMP Direct contact between sensors and borehole walls via solid inserts in the membrane for optimum reliability Modules of deformation obtained without correction thanks to the flexible membrane and solid inserts Allows measurements of rock anisotropy May be used in deep boreholes Automatic acquisition and real-time visualisation for enhanced control of the test Compliant to ISO 22476-5 & AFNOR P94-443.1 Key Features Deformations of the foundations of a concrete dams Deformations of the walls and roof of underground excavations such as underground power-plant and tunnels Deformation of bridges and arches abutments Design of pressurized penstocks in rock Applications 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 Borehole Dilatometer HIGH ACCCURACY DILATOMETER MAY BE USED IN DEEP BOREHOLE USER-FRIENDLY TABLET-OPERATED READOUT DMP e