The formation conditions,breakage characteristics,influence factors and instability forms of roof ＂triangular structure＂ in pitched seam gateway were analyzed,and show tension-shear cutting movement in upper and stress-shear in lower part in the slope force and vertical force of gravity,and behave cutting down or fall instability.The roof ＂triangular structure＂ stability mechanical model was set up,and the roof ＂triangular structure＂ stability criterion in different instability forms was obtained.%通过对大倾角煤层回采巷道顶板＂三角形结构体＂的形成条件、破断特征以及影响因素和失稳形态的分析,得出顶板＂三角形结构体＂在重力的倾向分力和垂直于顶板分力作用下呈上拉剪、下压剪破断运动,并表现为切落或坠落失稳。构建了顶板＂三角形结构体＂稳定性力学模型,得出顶板＂三角形结构体＂不同失稳形态下顶板稳定性判别准则。
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