There exits bed separation zone above water-conducting crack zone overburden after coal mining.
煤层采后覆岩中的导水裂隙带之上存在离层带。
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。
Most of the monitoring systems for roof bed separation are designed based on RS-485 BUS, which is low in both signal transmission efficiency and reliability.
国内顶板离层计算机测控系统多采用RS - 485总线，传输效率低，可靠性不高。
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