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为揭示工作面煤层瓦斯压力与采动应力耦合特征,针对不同应力状态,深入开展了工作面煤层瓦斯压力与采动应力“异步-同步”特征研究。结果表明,工作面煤层力学状态是引起瓦斯压力与采动应力耦合特性差异的根本所在。受采动影响,当工作面煤层发生扩容力学现象,煤层瓦斯压力峰值与采动应力峰值位置呈现异步特性,且瓦斯压力峰值位置超前于采动应力;当工作面煤层未发生扩容力学现象,煤层瓦斯压力峰值与采动应力峰值位置呈现同步特性。工作面瓦斯压力与采动应力耦合效应的“异步-同步”特性研究成果,为煤与瓦斯动力灾害有效防治提供了科学理论依据。
In order to reveal the coupling characteristics of gas pressure and mining stress in coal seam face, the gas pressure and mining stress of coal seam in working face are studied deeply according to different stress states. The results show that the mechanics state of coal seam in working face is the fundamental reason that causes the difference of coupling characteristics between gas pressure and mining stress. Affected by the coal mining, when the mechanics of coal seam expansion occurs in coal face, the peak value of gas pressure and the peak value of mining stress appear asynchronism, and the peak value of gas pressure is ahead of mining stress. When there is no phenomenon of expanding mechanics in coal seam, Gas pressure peak and mining stress peak position showed synchronous characteristics. The “asynchronous-synchronous” characteristics of the coupling effect between gas pressure and mining stress on working face can provide a scientific basis for effective prevention and control of coal and gas dynamic disasters.