The results show that bed separations mainly occur below the key strata, and the highest bed separation space is right below the primary key stratum.
结果表明：覆岩离层主要出现在各关键层下，覆岩离层最大发育高度止于覆岩主关键层。
Based on the key stratum theory in ground control, the basic principle in the design of mining under buildings should ensure that the primary key stratum would not break.
在此基础上，提出将控制覆岩主关键层不破断失稳作为建筑物下采煤设计原则的观点。
Theoretical analysis, simulation experiment and engineering exploration are adopted to study the impact of the location of primary key stratum on the evolution range of water flowing fracture.
采用理论分析、模拟实验和工程探测等方法，就覆岩主关键层位置对导水裂隙带高度的影响进行深入研究。
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