MÉNARD PRESSUREMETER
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MÉNARD PRESSUREMETER Pressuremeter test according To the ISO 22476-4 and ASTM D4719-07 standards Control Unit (C.U.), tubings and 3-cells probe to perform in situ Pressuremeter test in soils according to the ISO 22476-4 and ASTM D-4719-07 Standards. TEST DESCRIPTION A Pressuremeter test is an in-situ stress controlled loading test performed on the wall of a borehole using a cylindrical probe which can expand radially. From the test readings (volume variation based on controlled pressure), a stress-strain curve can be obtained, in the case of plane deformation, which yields : • the Ménard Pressuremeter modulus Em • the creep pressure Pf • the Menard limit pressure PL CU technical specifications • Dimension : 86 x 43 x 26 cm (tripod height : 65 cm) • Mass : 24.5 kg (tripod 3.5 kg) • Aluminium box with protection cover • Transport handle • Tripod and level allowing adjustment of verticality on all sites EQUIPMENT The Control Unit Equipped with devices to precisely regulate the pressure applied to the probe and to read its volume changes with pressure increments and time. A nitrogen cylinder provides the pressure source. The box stands on a tripod. It includes a 800 cm3 volumeter with a sight tube, a main pressure regulator, a differential pressure regulator, pressure gauges 0-2,5 and 0-60 bar for measuring and guard cells (100 bar in additional for weak rock tests), and the necessary valves and couplings. The plastic tubing This coaxial or twin tubing, flexible, high resistance with small dilatation, connects the probe to the monitoring box. The 3-cell probe It includes a central measuring cell, filled with water. Its volume changes are read on the Control Unit volumeter. The probe is totally protected by a rubber cover (different types regarding soils stiffness) which is inflated by the gas to form the 2 guard cells. Pressures applied to the 3 cells are balanced through the differential pressure regulator to ensure a true cylindrical deformation along the measuring cell. TEST PROCEDURE The borehole is drilled so as to minimize wall disturbance and keep a cavity diameter compatible with the probe size. The probe is lowered into the borehole to the required test depth and the pressure is applied by equal increments. Pressure and volume readings are taken on the Control Unit. In gravely soils and/or under water table level where the borehole would cave-in, the probe can be inserted in a specially designed slotted tube which is hammered or vibrodriven into the soil. Used without acquisition, the C.U. meets the requirements of the ISO 22476-4 standard part A. TEST TREATMENT Test Data can be processed by our software GeoVISION® ZA de Gomberville - 1 rue Salvador Allende - 78114 Magny les Hameaux - FRANCE Tél : +33 (0)1 30 52 35 42 – Fax : +33 (0)1 30 52 30 28 info@apageo.c

GEOSPAD®2 Data acquisition system pressuremeter data GENERAL PRESENTATION GeoSPAD® allows the acquisition of Pressumeter data via the central unit for soil investigation GeoBOX®. This system displays the conduct of pressuremeter tests and automatically records the conditions and data of these tests. GeoSPAD®2 system is integrated into Ménard pressuremeters which keep their full performance range whether or not they are used with GeoSPAD®2. GeoSPAD®2 is a waterproof box including 2 pressure sensors of 0-100 bar and a magnetostrictive sensor for volume (ultrasonic technology sensor on...