Fluid-solid coupling coal petrography shear-seepage test shearing and sliding combined shearing box

Abstract

The invention discloses a fluid-solid coupling coal petrography shear-seepage test shearing and sliding combined shearing box which comprises an upper box body and a lower box body which are fixedly connected with each other, wherein cavities for containing test pieces are formed in the upper box body and the lower box body; a first flange and a second flange are respectively arranged on the front side and the rear side of the upper box body; a third flange and a fourth flange are respectively arranged on the front side and the rear side of the lower box body; a second rolling way and a second rolling way are respectively arranged on two sides of the first flange and the two sides of the second flange of the upper box body; clamping plates are arranged on the second rolling way and the third rolling way; a fourth rolling way and a fifth rolling way are respectively arranged on the inner sides of the third flange and the fourth flange of the lower box body; four threaded holes are rectangularly formed in the lower box body; waist-shaped through holes are formed in positions, which correspond to the threaded holes, on the upper box body; bolts penetrate through the clamping plates and the waist-shaped through holes and are matched with the threaded holes. The fluid-solid coupling coal petrography shear-seepage test shearing and sliding combined shearing box can simulate a real actual working condition, so that the test precision can be improved.

Description

technical field [0001] The invention relates to a test device, in particular to a shear box for testing coal and rock shear seepage tests. Background technique [0002] During the production process of the mine, the excavation engineering destroys the balance of the stress field of the original rock and the balance of the original gas pressure, forming the stress redistribution and gas flow of the surrounding rock mass. Coal bed gas (coal bed methane) permeability is a physical parameter that reflects the difficulty of gas seepage in coal seams, and is also an important parameter for gas seepage mechanics and engineering. Therefore, the research on the calculation method of coal seam gas permeability or coal seam air permeability coefficient is the key technology for the development of gas seepage mechanics, and it is also the key starting point for coal mine safety workers to study a series of mine safety issues such as coal and gas outburst and gas explosion. [0003] The...

AI Technical Summary

Problems solved by technology

However, in the existing technology, the air or water filling pressure of the shearing box is too small, it is difficult to truly simulate the current working conditions, and there is static friction between the upper and lower boxes during shearing, so large experimental errors will occur

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