Study on Mechanical and Acoustic Emission Characteristics of Coal Rock Under Cyclic Loading

DENG Chuan

Safety in Coal Mines > 2020 > 51(2): 63-69.

DENG Chuan. Study on Mechanical and Acoustic Emission Characteristics of Coal Rock Under Cyclic Loading[J]. Safety in Coal Mines, 2020, 51(2): 63-69.

Citation:

DENG Chuan. Study on Mechanical and Acoustic Emission Characteristics of Coal Rock Under Cyclic Loading[J]. Safety in Coal Mines, 2020, 51(2): 63-69.

Citation:

DENG Chuan. Study on Mechanical and Acoustic Emission Characteristics of Coal Rock Under Cyclic Loading[J]. Safety in Coal Mines, 2020, 51(2): 63-69.

Study on Mechanical and Acoustic Emission Characteristics of Coal Rock Under Cyclic Loading

DENG Chuan

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Published Date: February 19, 2020

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Abstract

Abstract

In order to study the mechanical characteristics of coal deformation and failure and the evolution of acoustic emission b value of coal in parallel bedding direction, the coal sample in Bijie Mining Area of Guizhou Province is taken as the research object. In this paper, the indoor multi-stage cyclic loading and unloading test is conducted with MTS815. The results show that the elastic modulus exhibits a three-stage change trend, namely, a sharp increase-a slow increase-a sharp decrease; Poisson’s ratio and irreversible strains also exhibit a three-stage change tendency, that is, a slow increase-a gradual increase-a sharp increase. As the stress level increases, the b value of acoustic emission fluctuates somewhat and then stabilizes. When the coal sample is close to rupture, the acoustic emission b value is further reduced.
- coal,
- cyclic loading,
- acoustic emission,
- strain energy,
- b value

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References

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