The observation on 704 coal face of Fuliu coal mine shows that periodical pressure can also be caused by immediate roof due to its periodical rupturing under certain geological conditions.

• 本文依据广西罗城矿务局呼略矿704面的开采试验,说明了直接顶在一定的地质条件和生产技术条件下,也可以产生周期性的断裂,形成周期性的压力。