湿度场下矩形巷道围岩破坏规律的数值研究

Numerical analysis on the failure law of rectangular roadways under humidity conditions

为探究高湿度环境对矩形巷道破坏过程的影响,利用湿度-应力-损伤耦合模型,采用岩石破裂过程分析软件湿度版,建立3种层状岩层煤巷数值模型及3种开采方式的煤-岩巷道数值模型,再现湿度场下矩形巷道围岩破坏过程,分析湿度场下巷道变形随时间变化的特点。结果表明:湿度对矩形巷道的变形和破坏有显著影响。煤巷的破坏裂纹首先在两帮的煤层中萌生,进而扩展到强度较低的顶板或者底板,最终扩展到强度较高的岩层中;煤-岩巷道顶板的变形量与煤层的相对位置有关,虽然破坏同样先出现在煤层中,但是与煤巷不同的是,裂纹向距离煤层近的顶板或底板扩展。

In order to reveal the failure process and failure characteristics of rectangular roadways under high humidity conditions,three kinds of layered rectangular coal roadways and three kinds of coal-rock roadways with different quarrying positions are simulated with a humidity-mechanical-damage coupled model and the humidity diffusion edition of realistic failure process analysis（ RFPA）. The failure process of rectangular roadways under humidity environment is represented,and the characteristics of time-dependent deformation and the evolution rules of surrounding rock in humidity field are analyzed. For coal roadways,cracks occur from both sides of laneways,and then expand to coal roof or floor with lower strength,finally into higher strength rocks. For coal-rock roadways,the displacement of floor is related to the position of coal,and even though the cracks start in the coal as the same as coal roadway,they extend to the roof or floor near the coal.