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。
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.
通过对相似模拟实验中内部位移与表面位移的测试和对比分析，指出在模型实验的不同阶段，内部位移与表面位移具有明显的差异，力学分析证明了这一结果。
By comparing and analyzing the interior and surface displacement in simulating test, it was pointed out that there are distinct differences between them, which was proved by mechanical analysis.
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