采场覆岩中复合关键层的形成条件与判别方法

Formation Conditions of Compound Key Strata in Mining Overlayer Strata and Its Discriminance

在采场覆岩运动中起主要控制作用的岩层为关键层,而有时关键层是由2层或2层以上岩层形成的复合岩层所组成,我们称其为复合关键层.本文在深入揭示复合岩层形成机理的基础上,给出了形成复合岩层的力学条件与数学表达式,进而建立了采场覆岩中复合关键层的判别方法,并编写了复合关键层的判别程序.实例分析表明,复合关键层在岩层运动中是客观存在的,比同组岩层分开后的单一岩层的控制作用的线性叠加要大得多.本项研究是岩层控制的关键层理论研究的深入和发展,将有力促进岩层控制理论和技术的发展.

Key strata is a rock seam which plays an important controlling roles in the movement of mining overlayer strata while the key strata is sometimes made up of two or more compound rock strata. According to the deep analysis on the formation mechanism of compound rock strata, the mechanical condition of compound rock strata formation and the related formula are obtained to build up the differentiate method of the compound key strata in the coal face strata and the corresponding differentiate program is made. The example analysis indicates that the compound key strata objectively exists in the motion of rock strata, and it plays a much more important controlling role than that of single rock, which is separated from same rock groups. This study is the development of key strata theory in ground control research, which will strongly promote the development of the key strata theory in ground control and its technique.