Coal rock medium state transition degree evaluation device and use method

Abstract

The invention provides a coal rock medium state transition degree evaluation device, and relates to a coal rock sample, the coal rock medium state transition degree evaluation device comprises a loading device, a stress-strain acquisition system, a stress loading system, a test bench and a sound wave acquisition system, a coal rock sample is placed on the test bench, and the top of the coal rock sample is connected with the loading device; the stress-strain acquisition system and the stress loading system are respectively connected with the loading device, the sound wave acquisition system isprovided with sound wave probes, the periphery of the coal rock sample is uniformly bonded with the sound wave probes, the stress-strain acquisition system is provided with strain gauges, and the strain gauges are arranged at the periphery of the coal rock sample. The invention further provides a use method of the coal rock medium state transition degree evaluation device. According to the method,the sound wave monitoring technology is applied, multi-area sound time characteristic parameters are adopted to accurately represent the coal rock internal cmachine frame development condition, and the coal rock medium state transition degree damage is comprehensively evaluated.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a coal-rock medium state transition degree evaluation device and a use method. Background technique [0002] In the process of coal seam recovery, under the continuous action of high mining stress, the evolution of internal cracks in coal rocks leads to aggravated damage, and the state of the medium gradually changes from a natural continuum undisturbed by mining to a loose body damaged by severe mining disturbances. Especially in the deep special mechanical environment, the deformation characteristics of coal and rock transform from brittle to ductile, the timeliness of the failure process is enhanced, and the inherent characteristics of the medium state transition are more obvious. The gestation and occurrence of mining disasters are closely related to the degree of coal-rock medium state transition. A comprehensive, reasonable and effective evaluation of the state transiti...

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Problems solved by technology

[0003] At present, the research on the degree of damage and damage of coal and rock is mostly centered on "crack propagation and evolution", and the damage and damage degree of coal and rock are characterized according to the development and expansion of cracks, and there is a lack of quantitative evaluation indicators for the degree of damage and damage of coal and rock based on acoustic characteristics.

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