orbital paramagnetism

It introduces some conditions under pressure in tail entry of 1214 coal face in Gengcun Coalmine in excavation.

介绍了耿村煤矿1214工作面轨道顺槽在掘进过程中受压情况,提出了维护方案及今后放顶煤工作面两顺槽支护改进措施,为放顶煤工作面拙进提供了借鉴。