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针对深部无预掘通道停采回撤空间冒顶及撤架事故,分析了停采空间直接顶与基本顶最危险的破裂形态。研究表明:扩帮与撤架对停采空间顶板产生持续扰动影响;强荷载下,直接顶呈现分区渐进破裂形态;中心区颈缩段贯穿后,直接顶极易形成块体滑冒结构;随支架不断回撤,基本顶易形成侧向回转结构而引发支架失稳;利用“小通道+掩护支架+间替抽撤”的撤架方式,可以限制顶板破裂。
Aiming at the roof fall and withdrawing accident caused by the withdrawal and withdrawal of deep excavation with no pre-excavation channel, the most dangerous rupture pattern between direct roof and basic roof of the cut-off space is analyzed. The results show that: the expansion and removal of shelving space roof continued to disturb the impact; under strong load, the direct top showed sub-district gradual rupture; the central area of the neck through the cut, the direct top is easy to form a block slippery structure; Stent continued withdrawal, the basic top easy to form a lateral rotation structure and lead to stent instability; the use of “small channel + shielding stent + between the withdrawal ” withdrawal method, you can limit the roof rupture.