煤层顶底板等效岩性的确定方法

Methods of determining equivalent rock type of coal seam roof and floor

为了解决煤层顶板、底板对瓦斯涌出的影响的问题,采用矿压和数值分析理论与现场统计相结合的方法,研究了采掘煤层顶板和底板的岩性、厚度对采掘工作面瓦斯涌出的影响规律,提出了煤层顶底板等效岩性的确定方法.等效岩层分为回采顶板、底板、掘进顶板及底板四个类型各自命名,然后进行比较,采掘各选取一种排名靠前的岩性作为顶底板等效岩性的最终命名.研究结果表明:该方法确定的等效岩性,简单合理,可有效支持瓦斯涌出等效层的划分,适用于所有经过正规勘探的生产煤矿.

In order to analyze the influence of coal seam roof and floor on gas emission,by combining the methods of mine pressure and numerical analysis theory with field statistics,this study investigates the influence of lithology and thickness of coal seam roof and floor on gas emission at a mining face,and proposes a new method for determining equivalent rock type of coal seam roof and floor.The equivalent lithology naming is categorized into four types: the roof of coal mining face,the floor of coal mining face,the roof of drivage roadway,and the floor of drivage roadway.The empirical formulas have been developed for the categorization based on statistical analysis.With the comparative studies,the highest matching lithology is selected as the final name of coal mining type and also one for roadway driving type.The study results show that the method for determining equivalent lithology is simple and rational,and can effectively support the division of gas emission equivalent layer.The method can be applied to all production coal mines with normal exploration.