The Crack Evolution and Damage Development of Coal Uniaxial Compression Failure under Different Gas Pressure

DOI

10.2991/iccet-15.2015.314How to use a DOI?

Keywords

raw coal gas pressure uniaxial compression micro-crack development damage

Abstract

To study the influence of gas pressure to coal failure process and crack evolution, using coal solid-gas coupled mechanics testing system, conducted the raw coal uniaxial compression failure experiment under different gas pressure; the evolution process of surface micro-cracks was synchronously observed and recorded, and was studied in comparison with coal macroscopic failure process; then the damage variable D of coal sample was defined based on elasticity modulus, and the evolution of D through macroscopic failure process was studied. The results show: cracking tips on coal surface appear at the yield stage, then start to develop rapidly after peak stress, and the coalescence of main crack happens at post-peak stage; the bigger gas pressure is, the lower the peak stress is; the exist of adsorption gas can delay the onset of surface crack initiation; the damage variable D begin to increase at yield stage, rise sharply after peak stress, and finally reached nearly 1 when the coal sample failed.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Peibo Han
PY  - 2015/11
DA  - 2015/11
TI  - The Crack Evolution and Damage Development of Coal Uniaxial Compression Failure under Different Gas Pressure
BT  - Proceedings of the 5th International Conference on Civil Engineering and Transportation 2015
PB  - Atlantis Press
SP  - 1682
EP  - 1688
SN  - 2352-5401
UR  - https://doi.org/10.2991/iccet-15.2015.314
DO  - 10.2991/iccet-15.2015.314
ID  - Han2015/11
ER  -