A positioning device for presetting a single crack in a rock sample

Abstract

The invention belongs to the field of geotechnical engineering, and in particular relates to a positioning device for presetting a single crack in a rock sample. It includes a plastic mold, an oval thin iron sheet, an electromagnet, and a variable voltage control device, and is characterized in that: the plastic mold includes four side plates and upper and lower bottom plates, and the oval thin iron sheet is inside the plastic mould, After the electromagnet is energized, it can generate a magnetic force on the elliptical thin iron sheet. The variable voltage control device can adjust the magnitude of the magnetic force generated by the electromagnet. Iron sheet for positioning. The invention ensures the accuracy of fissure positioning and non-destructiveness to surrounding materials in the process of presetting fissures; it can simulate various rock fissures of different shapes and sizes; and it has a wide range of applications.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering, and in particular relates to a positioning device for presetting a single crack in a rock sample. Background technique [0002] The 21st century is the century of underground engineering. Underground hydropower stations, large-scale mine roadways, underground railways, river crossing tunnels, underground oil storage caverns, etc. are all being built on a large scale at home and abroad, and the research focus of rock mechanics is increasingly shifting to underground. In the construction of underground engineering, fractured rock mass exists widely, and the stability of joints and fissures plays a vital role in the safety of the rock mass structure of the entire underground engineering to a certain extent. The randomness of the distribution of rock mass fissures, the diversity of shapes, the inhomogeneity of distribution and the complexity of spatial combination make the project have the ris...

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Problems solved by technology

[0005] 1. The article "Experimental Research on the Expansion and Penetration Process of Three-Dimensional Fracture Groups" introduces a method of simulating primary fractures by using elliptical thin aluminum sheets (see "Journal of Rock Mechanics and Engineering" 2008, issue 1, author Guo Yanshuang, etc.) , where the thin aluminum sheet is fixed with a thin wire for positioning, but the thin wire will affect the homogeneity and continuity of the sample;

[0006] 2. The article "Experimental Research on Three-dimensional Expansion of Embedded Elliptical Cracks under Compression and Shear Conditions" introduced a method of using polyester film to construct internal cracks (see "Journal of Solid Mechanics" Issue 1, 2011, author: Guo Yanshuang, etc.), This method uses a thin cotton thread suspension method to fix the crack in the mold, and the same thin thread will affect the homogeneity and continuity of the sample

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