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中文摘要：
基于薄＂板＂和简支＂梁＂理论对下向进路人工假顶失稳机理进行了研究,综合考虑了进路布置方式、底筋作用、微裂隙发展等因素。分析了薄＂板＂模型适用于上下进路平行相错布置情况,易发生贯穿整个进路顶板的失稳冒落,甚至发生悬臂＂梁＂状态的折断;简支＂梁＂模型适用于上下进路斜交（或垂直）情况,人工假顶不会发生连环破坏,但采用吊筋对人工假顶稳定性影响不大,真正起作用的是底筋网。对下向进路胶结充填采矿法生产的矿山具有很好的指导作用。
英文摘要：
Instability mechanism of artificial roof of underhand drift has been studied on the basis of the theories of thin ＂plate＂ and simply supported ＂beam＂, which has considered the approach drift layout, bottom tendons role, development of micro-cracks and other factors synthetically. The study shows that the thin ＂plate＂ model is applicable to the situation that upward drift and underhand drift are parallel crisscross. But it easily causes unstable caving throughout the roof into the path, even worse is that the cantilever ＂beam＂ fractures. The simply supported ＂beam＂ model is applicable to the situation that upward drift and underhand drift are oblique （ or vertical） crisscross, and a chain of damages will not occur in the artificial roof. But using of suspended tendons has little effect on stability of the artificial roof and the tendon network really works. It gives a reference to the mines that apply the cemented filling mining method for the underhand drift.
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