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Bulletin of Engineering Geology and the Environment

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10-07-2018 | Original Paper

Deformation failure characteristics of coal–rock combined body under uniaxial compression: experimental and numerical investigations

Authors: Yulong Chen, Jianping Zuo, Dejun Liu, Zhenbo Wang

Published in: Bulletin of Engineering Geology and the Environment | Issue 5/2019

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Abstract

The deformation and failure behaviour of coal–rock combined body under uniaxial compression were investigated experimentally and numerically. The mechanical parameters, including the uniaxial compressive strength (UCS), elastic modulus and full-scale stress–strain curves, were obtained. A detailed analysis of the evolution of the internal cracks based on X-ray computed tomography (CT) observations and acoustic emission (AE) locations is presented. The experimental results show that the mechanical properties and deformation failure characteristics of the coal–rock combined body were governed mainly by the coal. The UCS and elastic modulus of the coal–rock combined body were slightly larger than those of the coal and most of the cracks occurring in the coal were a result of the uniaxial compression. Furthermore, a numerical simulation was conducted to validate the experimental evidence. Finally, based on this understanding, a constitutive relationship was proposed using the natural strain described in Hooke’s law for accurate modelling of the deformation of the coal–rock body. A good agreement was obtained between the numerical results and experimental data during the pre-peak regime.

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Title: Deformation failure characteristics of coal–rock combined body under uniaxial compression: experimental and numerical investigations
Authors: Yulong Chen
Jianping Zuo
Dejun Liu
Zhenbo Wang
Publication date: 10-07-2018
Publisher: Springer Berlin Heidelberg
Published in: Bulletin of Engineering Geology and the Environment / Issue 5/2019
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI: https://doi.org/10.1007/s10064-018-1336-0

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