Experimental device and method for detecting distribution status of coal fissures around drill holes

Abstract

The invention relates to an experimental device and for detecting distribution status of coal fissures around drill holes and an experimental method. The experimental device comprises a pressurizing system, a pressure transfer shaft, a cylinder, a round disk, a coal sample, a chassis, a drilling rig, a grouting pump, a glue pipe, a glue body and a hollow round disk; the method includes steps of filling high-temperature fluid glue in a coal sample drill hole, and penetrating it under a certain pressure to enter the coal fissures around drill holes; after cooling the glue body, dismounting the grouting device, pulling out a coal sample and peeling the coal powder; acquiring the glue body filled in the drill hole and the coal fissures; acquiring the space structure distribution of the coal fissures around drill holes after releasing pressure, scaling down at a certain ratio, and acquiring the space structure of coal fissures around drill holes under the pressing state. The experimental device and the method solve the technical difficulties that the coal fissures around drill holes are not intuitional and exact to observe for a long time. The method and device can be applied to directly and exactly detect the distribution status of the coal fissures around drill holes, and helpful to further explore a high-efficient drilling sealing technology.

Description

technical field [0001] The invention relates to an experimental device for detecting the distribution of fissures, in particular to an experimental device and method for detecting the distribution of coal fissures around boreholes. Background technique [0002] As we all know, in coal mines, it is a routine operation to drill holes into the coal seam and seal the holes, including the direct method to measure the gas pressure of the coal seam, the sealing of the gas drainage and the water injection of the coal seam, etc. [0003] Under the combined effect of drilling tool disturbance and mine stress concentration effect, the coal mass around the borehole is fractured and cracks are generated. Accurately grasping the distribution of the cracks will help to explore the sealing technology with higher practical value. [0004] At present, the detection methods for internal cracks in coal and rock mass mainly include ultrasonic detection, CT scanning, radiographic detection, magne...

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Problems solved by technology

[0006] In the open literature, there is no direct detection method specifically for coal fractures around the borehole; therefore, in order to more accurately detect the distribution of coal fractures around the borehole, a method that can be used to detect the It is particularly urgent to test the experimental device for the distribution of coal fractures around the hole.

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