Acoustic emission energy calculation method based on complete stress-strain curve of loaded coal and rock

Abstract

The invention discloses an acoustic emission energy calculation method based on a complete stress-strain curve of loaded coal and rock. The method comprises the following steps: step (1), deformation energy Uepsilon is calculated according to the complete stress-strain curve of the loaded coal and rock; step (2), a curve of the deformation energy Uepsilon is traversed, previous and later Uepsilon values are compared every certain time period T, and T is a test sampling interval; step (3) when compared Uepsilon values drop, one acoustic emission event is recorded, and acoustic emission information is recorded. The method has the advantages that the calculation method is definite in physical meaning and high in operability, and calculating parameters and distinguishing steps involved in the method are all applicable to programming realization; the method not only can effectively acquire acoustic emission parameters in a post-peak failure stage of a uniaxial test and in a whole stage of a true triaxial test, but also can further reveal mechanical essence of production of acoustic emission phenomena, and provides one acoustic emission analysis way for schools and research units without acoustic emission testing conditions.

Description

technical field [0001] The invention belongs to the field of acoustic emission monitoring, and relates to an acoustic emission energy calculation method based on the full stress-strain curve of loaded coal and rock mass. Background technique [0002] Acoustic emission technology, as a mature nondestructive testing method, has been widely used in monitoring internal damage, crack initiation, expansion and penetration evolution, and energy release of loaded coal and rock geological materials. A large number of studies have shown that the research scale of coal and rock microfracture can be reduced to the acoustic emission phenomenon at the laboratory sample scale, or expanded to the microseismic, landslide, and earthquake phenomena at the mine and crustal scale. A common feature of coal and rock dynamic disasters such as rock bursts, coal and gas outbursts, water inrush, collapses, and landslides. Therefore, laboratory acoustic emission is a small-scale phenomenon of mine ear...

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Problems solved by technology

[0003] However, a large number of acoustic emission monitoring tests found that in the uniaxial test, the destruction of the coal rock sample caused the acoustic emission probe placed on the surface of the sample to fall off, resulting in the inability to obtain the acoustic emission parameters in the post-destruction peak stage; In the test, the coal and rock materials are fully enclosed by the loading pressure head, which makes the installation of the acoustic emission probe difficult and unusable

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