Université Des Sciences Et Technologies De Lille

Jean Secq

The invention relates to a cell for testing geomaterials on cylindrical specimens, of rock, ground or materials manufactured on sampling sites, including at least one piston for subjecting a specimen to a stress directed along the longitudinal axis of the specimen. According to the invention, the cell has, in addition, means for shearing the specimen, capable of cracking the specimen while it is being compressed in said at least one piston.

Triaxial cell for the testing of geomaterials in compression and in shear

The invention relates to a triaxial cell for testing geomaterials on specimens. The triaxial cell has at least one piston for subjecting a specimen to stress directed along the longitudinal axis of the specimen. Hydraulic means are provided for subjecting the lateral wall of the specimen to a stress, under the pressure of a fluid. The cell has at least one sealed test chamber-in which the specimen is placed, and a circuit for the controlled pressurization of said test chamber with a fluid, called the pressurizing fluid, and for the controlled draining of said fluid therefrom. The cell has mechanisms for subjecting the specimen to a tensile force, which are configured for removably fastening it between two attachments intended to move apart or closer together under the action of the piston so as to subject said specimen to longitudinal stress or on the contrary to remove the load therefrom.

Triaxial cell for the testing of geomaterials in compression and in tension

The invention relates to a collar for measuring the lateral deformation of a test piece during uniaxial or triaxial compression tests. According to the invention, the collar includes a metal hoop or a hoop that is made from composite materials, which can clasp the test piece and which is open. The free ends thereof are separated by a distance &#x394;. The inventive collar also includes a mechanism for directly or indirectly measuring the distance &#x394;. Between the free ends of the hoop, the mechanism includes at least one strain gauge.

Collar for measuring the lateral deformation of a test piece during compression tests, such as uniaxial or triaxial compression tests

The invention relates to a collar for measuring lateral deformation of a test piece during uniaxial or triaxial compression tests. According to the invention, the collar includes a metal hoop or a hoop that is made from composite materials, which can clasp the test piece. When the hoop is open, the free ends thereof are separated by a distance &#x394;. The inventive collar is also equipped with a measurement device for directly or indirectly measuring the distance &#x394;. Between the free ends of the hoop, the device can be a linear variable differential transformer-type probe. The invention also relates to a protective sleeve for the test piece, which can co-operate with the collar.

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Villeneuve d'Ascq, France

Jean Secq