Fully-mechanized sublevel coal caving face full-seam mining thickness is increasing, the movement range of overburden stratum also increasing, most obvious character is the more capacious range and more large span overburden large structure that formed in the higher position.
综合机械化放顶煤采场一次采出厚度加大，上覆岩层运动范围也必然加大，最明显的特征是在采场覆岩更高层位上形成范围更广、跨度更大的覆岩大结构。
参考来源 - 综放采场覆岩大结构运动规律及失稳冲击灾害防治研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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