深部开采冲击地压诱发瓦斯异常涌出原因分析

Study on Mechanism of Gas Outburst Caused by Rock Burst in Deep Mining

为研究深部开采冲击地压诱导瓦斯异常涌出致灾机理,分析了深部开采煤体高地应力和高瓦斯含量的物性特征,揭示出冲击地压诱发瓦斯涌出的动力条件和物质条件,结合KozenyCarmen方程建立煤体渗透率与开采影响下损伤裂隙煤体体积应变的关系式。研究结果表明:冲击失稳过程中煤体渗透率增加显著,冲击地压产生的振动效应加速煤体变形破坏,促使瓦斯快速大量涌出;冲击地压孕育过程中的煤体渗透率变化效应、煤体形成剪切滑移面效应、冲击地压诱发的煤岩体振动效应以及煤体温度升高效应的联合作用,导致了冲击地压后瓦斯的异常涌出。

In order to study the mechanism of gas outburst caused by rock burst in deep mining,considering physical property characteristics of high ground stress and gas content in deep mining,reveals the dynamic conditions and material conditions by which rock burst causes gas emission induced and establishes the relationship between coal permeability and the damage fracture volume strain of coal combined with the Kozeny-Carmen equation. The results show that the impact buckling process in which coal permeability becomes bigger,vibration accelerates the deformation and destruction which accelerates gas emission,the combined effect that ground pressure of coal permeability changes,specific surface area of coal is increasing,impact pressure induced vibration effect of coal or rock,coal temperature rises resulted in the abnormal pressure gas after the impact in gestated process of rock burst.