key stratum meaning in English
标准层
Examples
- Viscoelasticity analysis and application of key strata of covering rock to short wall mining
短壁开采覆岩关键层黏弹性分析与应用 - Combinatorial key stratum is the development of key stratum in shallow coal seam , it has the all properties of key stratum and itself ’ s property
摘要在分析组合关键层有关参数的基础上，推导出了组合关键层初次来压步距和周期来压步距的计算公式。 - 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
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。 - It is pointed that the thick unconsolidated layers above roof have effect on post - buckling behaviors of key stratum , the equilibrium path of roof is unstable from breaking to final subsidence
研究发现，顶板上覆厚松散沙层对关键层的后屈曲性态有影响；顶板从破断至极限下沉其平衡路径不稳定。 - 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
摘要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。