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

Abstract

The invention relates to a triaxial cell for testing geomaterials on specimens, for example specimens of rock, ground or manufactured materials, comprising: at least one piston (2) for subjecting a specimen (3) to a stress directed along the longitudinal axis of the specimen; hydraulic means for subjecting the lateral wall of the specimen (3) to a stress, under the pressure of a fluid, said cell comprising at least one sealed test chamber (5) in which the specimen (3) 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. According to the invention, said cell has means for subjecting the specimen to a tensile force, which means are designed for removably fasteningit between two attachments intended to move apart or closer together under the action of said at least one piston so as to subject said specimen to said longitudinal stress or on the contrary to remove the load therefrom.

Description

Technical field [0001] The present invention relates to a triaxial test unit for geotechnical materials, such as rocks and soils in particular, wherein the geotechnical materials are in the form of particularly cylindrical samples. Background technique [0002] The cylindrical sample may experience various pressure, loading, temperature, and drainage conditions. To control these different parameters, the test unit can be equipped with pressure sensors, temperature sensors, internal or external displacement sensors and strain gauges. The compressive stress can be axial, generated under the action of a hydraulic piston, and radial on the side of the sample under the action of the fluid under pressure. [0003] For this reason, a triaxial test unit is known from the document US 3.975.950 or JP 5.871.432, which needs to be placed in a test machine that functions as a press and is usually installed in a fixed position in a test chamber. [0004] In order to make this test unit independe...

AI Technical Summary

Problems solved by technology

[0009] However, it may be necessary to stress the specimen in axial tension, so the difficulty lies in finding a way to secure the specimen in tension when the upper and lower tables placed inside the body and the piston are no longer accessible

Images