There exits bedseparation 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。
2
The results show that bed separations mainly occur below the key strata, and the highest bedseparation 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。
3
Most of the monitoring systems for roof bedseparation are designed based on RS-485 BUS, which is low in both signal transmission efficiency and reliability.