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Acoustic emission early-warning method for underground coal unstability dynamic disasters

A dynamic disaster, acoustic emission technology, used in earth-moving drilling, mining equipment, mining equipment and other directions

Active Publication Date: 2014-06-25
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD +1
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  • Abstract
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  • Application Information

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Problems solved by technology

This has caused great confusion for the prediction and early warning of coal mass instability and dynamic disasters using the acoustic emission method.

Method used

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  • Acoustic emission early-warning method for underground coal unstability dynamic disasters
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  • Acoustic emission early-warning method for underground coal unstability dynamic disasters

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Embodiment Construction

[0019] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

[0020] From the point of view of the state of coal body, there are two states of coal body, that is, steady state and unsteady state. According to the total stress-strain curve of deformation and failure of coal rock ( figure 2 ), when the coal-rock mass load is less than the stress intensity, the coal-rock mass is in a stable state. When the coal rock is in the post-peak stress stage, the coal rock mass is in a critically stable state, and the coal rock may be unstable under external disturbances. Therefore, the coal rock is in the post-peak strain softening stage, that is, it is in an unsteady state.

[0021] The early warning of coal instability dynamic disaster is...

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Abstract

The invention discloses an acoustic emission early-warning method for underground coal unstability dynamic disasters. The method comprises the following steps that first, monitored object coal is sampled, and the sample is processed to be a standard mechanical test piece; second, a compression fracture mechanical test is carried out on the standard mechanical test piece, and the fracture type of the test piece is determined; third, the stress condition of the monitored coal is analyzed, and the fracture type of the monitored coal is determined according to the fracture type of the standard mechanical test piece; fourth, an acoustic emission instrument is used for monitoring the coal, and collecting acoustic emission signals; fifth, according to the fracture type of the monitored coal and the acoustic emission signals, distinguishing of coal stability is carried out in a classified mode. The early-warning method of the coal unstability dynamic disasters solves the scientific problem of acoustic emission omen of coal and rock mass fracture unstability, and effectively improves accuracy for monitoring and early-warning of coal unstability dynamic disasters through the acoustic emission method.

Description

technical field [0001] The invention relates to the technical field of geotechnical and mining engineering, in particular to an acoustic emission early warning method for dynamic disasters of coal instability. Background technique [0002] In the mining of underground coal mines, coal-rock instability dynamic disasters such as slabs, rock bursts, and coal and gas outbursts are often encountered. The essence of these coal-rock instability disasters is the rupture and instability of the coal-rock mass medium. Acoustic emission prediction method of coal and rock mass instability is a dynamic and continuous prediction method. At present, there is a lot of confusion about the acoustic emission identification model of coal and rock mass instability. Especially for the models that use events (or ringing) and energy parameters to judge the stability of coal bodies. Some studies have found that before the coal mass loses stability, the acoustic emission parameters increase abnormal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/18
Inventor 杨慧明戴林超文赋王波张淑同苗法田刘延保于海云李建功
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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