Test device and test method for determining water pressure inside crack of coal injection coal seam

Abstract

The invention discloses a test device and test method for determining water pressure inside a crack of a coal injection coal seam, and belongs to the technical field of pore water pressure testing. Atechnical problem that the water pressure in a coal body around a water injection drilling hole cannot be tested in the prior art is solved. The device comprises a test mechanism and a display mechanism. An outer casing is provided with a plurality of water inlet holes of different apertures, a plurality of partition plates are arranged in a cylindrical cavity inside the outer casing, and the cavity is divided into a plurality of sealing cavities by the baffle plates. According to the test device and the test method, through the cooperation of a test mechanism and a display mechanism, the apertures of the water inlet holes are obtained, with the apertures as an intermediate quantity, the water pressure inside a coal body crack structure around the coal seam water injection drilling hole ina coal seam water injection process is accurately and quantitatively calculated, and a calculation result has an important role in adjusting coal seam water injection parameters and improving the comprehensive disaster prevention effect of coal seam water injection.

Description

technical field [0001] The invention relates to the technical field of pore water pressure testing, in particular to a testing device and a testing method for determining the water pressure in the coal body fissure structure around a coal seam water injection borehole. Background technique [0002] Coal seam water injection is a comprehensive mine disaster prevention technology commonly used in the world. After decades of practice and development, nearly 80% of fully mechanized mining faces in my country have adopted coal seam water injection technology. In recent years, with the continuous improvement of this technology and process, the application field of coal seam water injection technology is also expanding, from the initial dust reduction, prevention of rock burst, coal and gas outburst and other disasters, to the current development to eliminate coal seam water injection technology. At the same time, it is widely used in the fields of softening hard roof and caving co...

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Problems solved by technology

[0003] In the prior art, the method for measuring the fluid pressure in the coal body around the water injection borehole is: constructing the borehole - laying the pressure measuring pipeline - sealing the hole - installing a pressure gauge at the orifice - reading, the pressure displayed by the pressure gauge in this method is gas , the combined pressure of the two phases of water, and the pressure of water cannot be accurately measured

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