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Geomechanics and Engineering Volume 16, Number 1, September20 2018 , pages 85-95 DOI: https://doi.org/10.12989/gae.2018.16.1.085 |
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Influence of water content on dynamic mechanical properties of coal |
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Helong Gu, Ming Tao, Jingxiao Wang, Haibo Jiang, Qiyue Li and Wen Wang
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| Abstract | ||
| Water affects the mechanical properties of coal and stress wave propagation. To comprehensively investigate the effect of water content on the properties of coal, laboratory tests including X-Ray Diffraction (XRD) analysis, P-wave test, S-wave test, static and dynamic compression test with different water contents were conducted. The compressive strength, elastic modulus and failure strain and their mechanism of coal specimen under coupled static-dynamic load with the increased water content were observed. Meanwhile, energy transmission and dissipation characteristics of a stress wave in coal specimens with different water contents under dynamic load and its relation with the failure features, such as fragmentation and fractal dimension, of coal was analyzed. Furthermore, the dynamic interpretation of water infusion to prevent coal burst based on water infusion model of coal seam roadway was provided. | ||
| Key Words | ||
| coal; water content; dynamic mechanical properties; stress wave propagation; failure features | ||
| Address | ||
| Helong Gu, Ming Tao, Jingxiao Wang and Qiyue Li: School of Resources and Safety Engineering, Central South University, Changsha, Hunan, 410083, People\'s Republic of China Haibo Jiang: 1.) School of Resources and Safety Engineering, Central South University, Changsha, Hunan, 410083, People\'s Republic of China 2.) Safety Engineering Institute, Hunan Vocational Institute of Safety Technology, Changsha, Henan, 410151, People\'s Republic of China Wen Wang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan, 454003, People\'s Republic of China | ||