本文总结了李子垭煤矿试用“八”字型掩护支架采煤法在小倾角、急倾斜、薄煤层、坚硬顶板煤层中采煤获得成功,使该矿顶板管理大为改善的经验。文章还通过支架在不同条件下的受力、支架结构以及落煤工艺的分析,剖析了该支架正常下放的必备条件,总结了防止支架插入底板和向后仰倒的措施。 This paper summarizes the successful trial of the “eight” type shield mining method adopted by Liziya Coal Mine in the coal mining with small inclination, steep inclination, thin coal seam and hard roof coal seam, and greatly improves the roof management of the mine. The article also analyzes the necessary conditions for the normal decentralization of the stent through the analysis of the force of the stent under different conditions, the structure of the stent and the coal falling process, and sums up the measures to prevent the stent from being inserted into the bottom plate and backwards.