Static deformation experiment device for testing low-strength test piece

Abstract

The invention relates to a static deformation experiment device for testing a low-strength test piece. The technical scheme is that the static deformation experiment device comprises a testing device and a pressure transmitting device, wherein the testing device, the test piece (4) and the pressure transmitting device constitute a test piece testing body. Eight axial grooves (14) are uniformly formed along a generatrix of a large cylinder of a base (1), lower ends of radial strain measuring rods (5) and axial strain measuring rods (7) are fixed in the corresponding axial grooves (14) through screws (2) respectively, and the radial strain measuring rods (5) and the axial strain measuring rods (7) are in alternative distribution; big-head screws (6) are connected with upper ends of the radial strain measuring rods (5) through threads, electric resistance strain gauges (3) are attached to the radial strain measuring rods (5) and the axial strain measuring rods (7) respectively, and each electric resistance strain gauge (3) is externally connected with a strain indicator or a computer through a corresponding signal line (11); a gland (8) and a pressure head (9) are in threaded connection, and a rubber pad (10) adheres to the upper plane of the pressure head (9). The static deformation experiment device has the characteristics of convenience in mounting and debugging and small measurement errors.

Description

technical field [0001] The invention belongs to the technical field of testing devices for low-strength test pieces. In particular, it relates to a static deformation experiment device for testing low-strength test pieces. Background technique [0002] When performing rock mechanical performance testing, it is necessary to use static deformation test equipment to measure the deformation of the specimen during the test, measure the radial strain and axial strain during the deformation of the specimen, and calculate the mechanical performance parameters of the specimen. Although the existing static deformation test device can simultaneously measure the radial strain and axial strain of the deformed specimen during the pressurization test of the specimen, there are still the following problems: [0003] 1. When installing and debugging the axial strain measurement of the test piece, the relative position of the indenter and the gland is fixed by clamping the screw laterally. ...

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Problems solved by technology

[0003] 1. When installing and debugging the axial strain measurement of the test piece, the relative position of the indenter and the gland is fixed by clamping the screw laterally. Unclamping causes the gland to slide axially along the indenter under the influence of its own weight, which in turn leads to an increase in the error of axial strain measurement

[0004] 2. In the static deformation test of the low-strength specimen, when measuring the radial strain of the specimen, the screw end is used to make point contact with the side of the specimen, so that the side of the specimen is subjected to a point load during the deformation process, which is easy to cause During the radial deformation of the low-strength specimen, the screw is inserted into the specimen, which leads to an increase in the error of the radial strain measurement

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