The II3123 face is a light type caving face of three-soft coal seam. the roof is cracked, sloughing and roof fall often occur.
前言： 石台煤矿II3123工作面为“三软”煤层轻放工作面，顶板破碎易掉，片帮、冒顶时常发生。
The sound emission characteristics and the causes for incorrect prediction of the stope roof fall at Tonglushan Mine were analysed.
对铜绿山矿采场冒顶的声发射特征和预报不准的原因进行了分析。
The compound roof fall accident of the individual hydraulic prop face is analyzed. The accident mechanization and prevention method are pointed.
对单体支柱工作面复合型顶板推垮型事故进行了分析，提出了事故发生的机理和预防办法。
Based on the local, migratory and subsection characteristics of main roof fall of longwall face, the main roof was divided into some plate group, and plate group mechanical model was established.
针对长壁工作面顶板垮落具有局部、分段、迁移的时空特征，将长壁工作面采场顶板划分成若干个相互铰接的薄板，建立了薄板组力学模型。
A roof fall accident that was caused by bolt support is analyzed. The influence of the lane fault to bolt (cable) is pointed out. It has a certain reference for support selection of the same lanes.
对锚杆支护引起的一起冒顶事故进行了分析，指出了顺巷断层对锚杆(索)支护的影响，对同类巷道的支护选择具有一定的借鉴意义。
Roof fall in mines is one of the severe disasters in mining operation.
矿山冒顶是矿山生产过程中严重灾害之一。
Roof fall accident is one kind of dangerous accidents happened at underground mines and underground pressure management is the main task of mining safety management.
冒顶片帮事故是地下矿山危害最为严重的事故，矿山地压管理是地下开采矿山安全管理的重要任务。
So the minimal uncontrolled roof-fall span, displacement Angle and caving Angle are studied by similarity simulation.
借助相似模拟试验，研究了顶板自然垮落的最小跨度、移动角和垮落角。
So the minimal uncontrolled roof-fall span, displacement Angle and caving Angle are studied by similarity simulation.
借助相似模拟试验，研究了顶板自然垮落的最小跨度、移动角和垮落角。
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