【摘要】 本文依据广西罗城矿务局呼略矿 70 4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。文中分析了直接顶引起周期压力的原因和条件 ,提出了预防直接顶周期性压力灾害的措施。更多还原

【Abstract】 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. The paper analyzes the reasons and preconditions of this periodical pressure, then preventive measures of hazards caused by immediate roof periodical pressure is suggested.更多还原