摘要
根据四川省各矿进行的缓斜煤层工作面矿山压力研究的成果，叙述了采煤工作面周期来压的判断指标及其存在的问题。
Based on the research results of underground pressure at coal faces in gently inclined seams in coal mines of Sichuan Province,the author described the judging indexes for periodic loading at coal faces and the existing problems and proposed a new judging index,i.e.energy released from roof.
