Microscopic cracking evolution process test equipment for bifacial shearing of coal petrography

Abstract

The invention discloses microscopic cracking evolution process test equipment for bifacial shearing of coal petrography. The test equipment comprises a body, wherein the body is provided with a test piece cavity which is internally provided with a support; the top wall of the body is of a split structure and comprises a left top wall and a right top wall which are symmetrical in structure and are arranged at an interval to form a pressure head installation port; the front and rear ends of the body are provided with openings; a groove is formed in the part, which is over against the pressure head installation port, of the support; the left side wall of the body is provided with a guide hole; the front and rear parts of the left top wall are symmetrically provided with a first fastening bolt hole and a second fastening bolt hole which are communicated with each other; and the right top wall is provided with a third fastening bolt hole and a fourth fastening bolt hole which are symmetrical with the first fastening bolt hole and the second fastening bolt hole. The test equipment provided by the invention has the characteristics of wide adaptability, simple structure, low processing cost, high reliability, convenience in operation and the like.

Description

technical field [0001] The invention relates to a device for performing a double-sided shear test on coal and rock. Background technique [0002] With the increasing scale and intensity of coal mining year by year, coal-rock dynamic disasters such as rock burst, coal and gas outburst, and roof accidents are becoming more and more serious. Among them, rock burst seriously threatens the safe production of mines due to its sudden, sharp and violent destruction characteristics, and has caused huge economic losses and casualties to coal mines in our country. As a mine dynamic disaster phenomenon, rock burst is usually when the mechanical system of coal rock reaches the strength limit, the elastic energy accumulated in the coal rock mass is released suddenly, causing the coal rock mass to vibrate and destroy, and throwing the coal rock to the roadway , causing damage to brackets, equipment and shafts, and casualties of personnel. With the continuous increase of the depth and int...

AI Technical Summary

Problems solved by technology

[0004] Existing research equipment is mainly limited to the research on the mechanical properties of rock structural plane slippage, concrete strength, and shear properties of steel members, and the loading method is single, such as the shear test device disclosed in CN10194982B

At present, there is still a lack of an effective test method and special equipment to carry out research on the evolution of cracks and cracks on the internal and surface of coal and rock materials under the action of double-sided shear loads.

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