Method and device for in situ triaxial test
AssigneeLaboratoire Central des Ponts et Chaussees
InventorPhilippe Reiffsteck
Life of this patent
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Abstract
The device comprises a corer (1, 4) fitted with a flexible diaphragm (2) on its inside face, means (10) for driving the corer into the soil (11), means for breaking up the soil leaving the top orifice of the corer, means for applying axial forces on the diaphragm (2) and on the top face of the soil sample (12) contained in the corer, and means for measuring stresses and deformations to which the sample (12) is subject. While a measurement is being performed, the corer is held stationary in the soil (11).
Claims5
A method of measuring in situ the deformation moduluses of a soil sample (12) under conditions close to those of a triaxial compression test, the method being characterized by the following steps:
- driving a corer (1, 4) into the soil (11), the corer being fitted on its inside face with a flexible diaphragm (2);
- removing the material that leaves the corer (1, 4) through its top orifice as it is being driven into the soil, so as to form a sample (12) of soil for testing inside the corer;
- holding the corer (1, 4) stationary in the soil in order to proceed with a measurement;
- exerting pressure forces on the outside face of the diaphragm (2) and on the top face of the sample (12) so as to subject the sample to radial and axial stresses;
- and
- measuring the deformations to which the sample (12) is subject.
Apparatus for measuring in situ the deformation moduluses of soil under the conditions of a triaxial compression test, the apparatus being characterized by the fact that it comprises:
- a corer (1, 4) fitted on its inside face with a flexible diaphragm (2);
- means (10) for driving said corer into the soil (11) in order to form a sample (12) inside said corer;
- means for removing the material which leaves said corer through its top orifice while the corer is being driven into the soil (11);
- means for holding said corer stationary while taking a measurement;
- means for applying an axial force to the top face of the sample (12);
- means for applying pressure to the outside face of the flexible diaphragm (2);
- means for measuring the radial and axial stresses to which the sample (12) is subjected;
- and
- means for measuring the deformations to which the sample (12) is subject.
Dependencies are inferred from the claim text.