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Shock and Vibration
Volume 2016, Article ID 5121932, 10 pages
Research Article

Study on Impact Damage and Energy Dissipation of Coal Rock Exposed to High Temperatures

1State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
2School of Resources and Safety Engineering, Central South University, Changsha 410083, China
3College of Resources and Environmental Science, Chongqing University, Chongqing 400030, China
4Automotive School, Qingdao Technological University, Qingdao, Shandong 266520, China

Received 8 June 2016; Accepted 15 September 2016

Academic Editor: M. I. Herreros

Copyright © 2016 Tu-bing Yin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The dynamic failure characteristics of coal rock exposed to high temperatures were studied by using a split Hopkinson pressure bar (SHPB) system. The relationship between energy and time history under different temperature conditions was obtained. The energy evolution and the failure modes of specimens were analyzed. Results are as follows: during the test, more than 60% of the incident energy was not involved in the breaking of the sample, while it was reflected back. With the increase of temperature, the reflected energy increased continuously; transmitted and absorbed energy showed an opposite variation. At the temperature of 25 to 100°C, the absorbed energy was less than that transmitted, while this phenomenon was opposite after 100°C. The values of specific energy absorption (SEA) were distributed at 0.04 to 0.1 J·cm−3, and its evolution with temperature could be divided into four different stages. Under different temperature conditions, the failure modes and the broken blocks of the samples were obviously different, combining with the variation of microstructure characteristics of coal at high temperatures; the physical mechanism of damage and failure patterns of coal rock are explained from the viewpoint of energy.