深部含瓦斯煤冲击动力学试验研究进展及展望

Research progress and prospect of impact dynamics experiment of deep gas-bearing coal

  • 摘要: 随着煤炭开采深度的增加,煤体所处的地质力学环境由浅部相对简单的应力状态,逐步演化为高地应力、高瓦斯压力、高地温及强扰动共同作用的多场强耦合状态,其动力响应规律显著复杂化。近年来,国内外学者围绕复杂应力、瓦斯环境下的煤体开展了大量的冲击动力学试验并获得了丰硕的研究成果。系统综述近年来含瓦斯煤冲击动力学试验研究、试验结果的最新进展,重点梳理了从单轴(σ1σ2=σ3=0)、常规三轴(σ1σ2=σ3≠0)到真三轴(σ1σ2σ3≠0)含瓦斯煤霍普金森压杆(SHPB)试验系统的发展演变,介绍了不同类型含瓦斯煤霍普金森压杆试验系统的主体构成,分析了各类冲击压杆试验中试样形状、尺寸的要求以及相应的数据解算方法,综合归纳了不同加载模式下煤体的应力−应变曲线演化、峰值强度与应变、冲击破坏模式、能量耗散与瓦斯放散规律,总结了基于试验数据的含瓦斯煤动力学本构模型及其在损伤演化、渗流耦合方面的拓展,探讨了动静载作用下含瓦斯煤力学特性及劣化机制。最后,对未来研究方向进行了展望,指出真三轴多场耦合−动静联合加卸载,动静载组合下含瓦斯煤体多源信号智能监测,高静载、瓦斯压力以及动载荷叠加对煤体冲击失稳灾变机制的深入研究,将成为含瓦斯煤冲击动力学领域的重要发展趋势。

     

    Abstract: With the increase of mining depth, the geological mechanical environment of the coal body undergoes significant changes. From the relatively simple stress state at the shallow layer, it gradually transforms into a state with high stress, high gas pressure, high temperature, and strong disturbance, featuring multiple strong coupled fields. The dynamic response pattern becomes significantly more complex. In recent years, domestic and foreign scholars have carried out a large number of impact dynamics tests for coal under complex stress and gas environment and obtained fruitful research results. The latest progress in experimental research and experimental results of impact dynamics of gas-bearing coal in recent years is systematically reviewed. The development and evolution of split Hopkinson pressure bar (SHPB) experimental system for gas-bearing coal from uniaxial(σ1σ2=σ3=0), conventional triaxial (σ1σ2=σ3≠0) to true triaxial (σ1σ2σ3 ≠ 0) are reviewed. The main components of different types of gas-containing coal Hopkinson pressure rods are introduced. The requirements for the shape and size of the test samples needed for different gas-containing coal impact pressure rods, as well as the data calculation methods, are analyzed. It comprehensively summarizes the stress-strain curve evolution, peak strength and strain, impact failure mode, energy dissipation and gas emission laws of the coal body under different loading conditions. The dynamic constitutive model of gas-bearing coal based on experimental data and its expansion in damage evolution and seepage coupling are reviewed. It also discusses the mechanical properties and degradation mechanisms of gas-containing coal under dynamic and static loads. Finally, the future research directions are prospected, and it is pointed out that true triaxial multi-field coupling-dynamic-static combined loading, intelligent monitoring of multi-source signal of gas-bearing coal under dynamic and static load combination, and in-depth study on the catastrophe mechanism of coal impact instability under the superposition of high static load, gas and dynamic load , will become an important development trend in this field of gas coal impact dynamics.

     

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