重力滑动构造对煤与瓦斯突出的控制作用

The controlling role of gravitational slide structure to coal and gas outburst

在大量瓦斯基础参数测试和瓦斯地质资料分析的基础上,从将军岭重力滑动构造的基本特征入手,分析了重力滑动构造的形成机制,研究了重力滑动构造对煤层厚度、煤体结构、应力状态、煤的变质程度、瓦斯赋存等的影响,阐明了重力滑动构造对煤与瓦斯突出的控制作用。研究结果表明,滑动过程造成了煤体原生结构遭到破坏,煤层厚度变化较大,煤的变质程度相对较高,吸附能力相对较强,瓦斯生成量相对较大。重力滑动构造后缘主要受到拉张应力作用,煤层顶板裂隙较为发育,且形成一系列高角度正断层,有利于瓦斯的逸散,不利于突出的发生;滑动构造前缘主要受到挤压应力的作用,易形成逆冲断层组合,并在煤层顶板形成一致密的隔水隔气层,阻碍瓦斯的逸散,使连接点以深瓦斯含量急剧增加,容易发生煤与瓦斯突出事故。

Based on lots of gas measuring parameters and gas-geological analyzing data,gravitational gliding structure formation mechanism was analyzed from the basic character,and the influence of gliding structure on coal thickness,coal body structure,stress state,coal metamorphism degree,and gas occurrence were studied,and the controlling role of gravitational gliding structure to coal and gas outburst was clarified.The results show that due to the control function of gravitational gliding structure,the original structure of coal is damaged,coal thickness has large variation,coal metamorphism degree is relatively taller,adsorption ability is relatively strong,and the gas volumn is relatively high.The trailing edge is mainly affected by tensile stress with more fissures in coal seam roof,and form a series of high angle normal faults,which makes for the absence of gas and restrains outburst happening.The leading edge which is mainly affected by compressive stress forms thrust fault combination and a dense water-barrier protection strata in coal seam roof,which hinders gas emission and makes gas content increased dramatically,and which is prone to coal and gas outburst accidents.