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煤炭工程  2015 

基于体积应变含瓦斯煤体渗透特性研究

DOI: 10.11799/ce201508030, PP. 92-95

Keywords: 渗透特性,响应特征,瓦斯流量,渗透率采动响应模型

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Abstract:

为获得含瓦斯煤体渗透特性的采动响应特征,应用理论分析、数值模拟和现场试验相结合的方法对含瓦斯煤体渗透率的采动响应机制进行了研究。依据孔隙率的定义,以Kozeny-Carman方程为桥梁,建立了基于体积应变的含瓦斯煤体渗透率的采动响应模型。基于渗透率采动响应模型,采用COMSOLMultiphysics模拟了煤层开采过程中渗透率的变化规律,并在现场开展了渗透率的采动响应研究。结果表明采动是影响煤体渗透率的主要因素,煤体体积应变、渗透率和瓦斯流量在采动过程中具有基本一致的变化规律,随着工作面的临近,煤体膨胀变形、渗透率逐渐增大,在靠近工作面处达到最大值;距工作面相同位置处,回风巷侧煤体的瓦斯流量大于运输巷侧,越靠近工作面煤体的渗透性越大。

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