Loading test method and device for realizing axial gradient static stress on rock-like materials

Abstract

The invention relates to a loading experimental method and device for achieving axial gradient static stress on a rock-like material. The device comprises a rolling shaft. A lower steel plate, a lowerrubber gasket, a test piece, an upper rubber gasket and an upper steel plate are successively arranged from bottom to top on the rolling shaft. The lower steel plate and the lower rubber gasket and the upper rubber gasket and the upper steel plate are bonded together, separately, two sides of the upper steel plate and the lower steel plate are connected through uniformly and symmetrically arranged bolts, the right ends of the upper and lower steel plates are in tight contact with a right baffle plate, a gap is reserved between the right end of the test piece and the right baffle plate, and the symmetric line between the upper steel plate and the lower steel plate, the axis of the test piece, and the axis of an axial loading device are superposed. The loading experimental step comprises the following steps: preparing the test piece; determining an applied load and torques of the bolts; mounting the loading device; applying the torques to the bolts; applying loads to the test piece. Thedevice can apply axial static stress of different gradient amplitudes, so that the gradient static stress can achieve strength extremity thereof.

Description

technical field [0001] The invention relates to a loading technology of axial gradient static stress, in particular to a loading experiment method and device for realizing axial gradient static stress on rock-like materials. Background technique [0002] Determining the mechanical properties of various materials through laboratory experiments is one of the main methods for scientific research. At present, most conventional compression test devices are only loaded on the two end faces of the specimen. When the specimen is of equal cross-section, the static stress on each cross-section is equal. This loading method can only test the mechanical properties of small-sized specimens, such as concrete specimens, whose size is generally 150mm×150mm×150mm. For conventional uniaxial or triaxial compression tests on rocks, the size of the cylindrical specimen is generally 50mm in diameter and 100mm in height. These conventional experimental methods or equipment can only apply uniform...

AI Technical Summary

Problems solved by technology

However, the existing method is realized by hanging counterweights, and there are many deficiencies. The strength of rock-like materials is generally 10 to 10 2 MPa level, it is difficult to reach the strength limit of the material by hanging the counterweight; in addition, the process of hanging the counterweight is time-consuming and laborious, and it is difficult to ensure safety

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