Creep behaviour and constitutive model of coal filled with gas

Coal exhibits different creep behaviours when filled with different amounts of gas. Creep tests of coalfilled with 0 and 0.5 MPa gas were performed, and strain under different axial stress was compared. The three creep constitutive models which were analysed using the method fitting experimental dat...

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Bibliographic Details
Published in:International journal of mining science and technology 2017-09, Vol.27 (5), p.847-851
Main Authors: Li, Xiangchun, Yang, Chunli, Ren, Ting, Nie, Baisheng, Zhao, Caihong, Liu, Shuiwen, Jiang, Tao
Format: Article
Language:English
Subjects:
Coal
Coal
Gas
Creep
Constitutive
Constitutive model
Creep
Gas
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Summary:Coal exhibits different creep behaviours when filled with different amounts of gas. Creep tests of coalfilled with 0 and 0.5 MPa gas were performed, and strain under different axial stress was compared. The three creep constitutive models which were analysed using the method fitting experimental data for determining which creep model can reflect the creep process of the test best. The results show that the deformation of coal filled with 0.5 MPa gas is more higher than that of coal filled with 0 MPa gas under the same axial stress. Gas plays a positive effect on the deformation of coal process and will accelerate creep process. And gas will reduce coal intensity and change coal creep properties. Compared with Nishihara Model and Extensional Nishihara Model, Burgers Model can reflect the three stages of creep process of coal filled with gas better. The research results can contribute to reveal coal and gas outburst mechanism.
ISSN:2095-2686
DOI:10.1016/j.ijmst.2017.07.017