Geomechanics and Engineering

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Influence of water content on dynamic mechanical properties of coal

  • Gu, Helong (School of Resources and Safety Engineering, Central South University) ;
  • Tao, Ming (School of Resources and Safety Engineering, Central South University) ;
  • Wang, Jingxiao (School of Resources and Safety Engineering, Central South University) ;
  • Jiang, Haibo (School of Resources and Safety Engineering, Central South University) ;
  • Li, Qiyue (School of Resources and Safety Engineering, Central South University) ;
  • Wang, Wen (School of Energy Science and Engineering, Henan Polytechnic University)
  • Received : 2017.12.05
  • Accepted : 2018.03.29
  • Published : 2018.09.20
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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.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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