【摘要】 本文根据相似理论 ,对多裂隙直接顶的破坏问题进行了模拟实验及控制研究。按照不同老顶失稳方式、直接顶裂隙及块体形式设计制作了 6个模型 ,采用摄影量测法及网格图法处理实验结果。根据实验结果分析了多裂隙直接顶破坏冒顶规律并提出了控制措施。更多还原

【Abstract】 Based on similarity theory, immediate roof with many cracks caving in longwall face are studied and controlled by modelling experiment. According to variable destabilizing conditions, immediate roof crack and block form, we make six models, and process the experiment results by using the photographic surveying and the grid chart. According to the testing results, analysis the principle of the caving of the immediate roof with many cracks and put forward the controlling measurement.更多还原