The balance structure of main roof and its action to immediate roof in large cutting height workface;
本文分析了顶板运动对冲击矿压的作用，采用“砌体梁”理论研究了断层倾向对顶板平衡结构的影响。
Accordingly, the new design method of anchor cable parameters applying to thick soft immediate roof is proposed.
提出了基于厚层软弱直接顶的新的锚索参数设计方法。
Based on field observations and theoretical analyses, the characteristic of periodic caving of immediate roof and main roof in a room and pillar system was analyzed.
通过理论分析和现场实测，对房柱式采煤的矿压显现规律及其特点进行了探讨。
The movement and breakage of top coal, especially its internal micro-fracture extension, are closely related to the movement regularity of its immediate roof and main roof.
顶煤的运移与垮落，尤其是内部微观裂隙的扩展，与其直接顶和老顶岩层的活动规律密切相关。
The results show that the abutment pressure distribution on coal pillar is the direct reflection of abutment stress induced by mining on the interfaces of coal seam and immediate roof.
研究结果表明，煤柱上支承压力分布是开采影响岩层相互作用的结果，是开采引起集中应力在煤层与直接顶界面上的直接反映。
Simulation testing and theoretical analysis were made to study generating mechanics and moving evolutionary process of "granular arch" structure of upper immediate roof in top coal caving.
通过相似模拟实验和理论分析，研究了综放条件下上位直接顶“散体拱”结构的形成机理和移动演化过程。
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。
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。
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