分析了复合顶板巷道的破坏特征,建立了复合顶板巷道破坏的力学模型并研究了巷道破坏机理,此类巷道顶板的最大应力位置为巷道肩角或顶板中间。基于复合顶板巷道的破坏机理,提出了软弱复合顶板煤巷帮顶同治强化围岩支护原理。 The failure characteristics of compound roof roadway are analyzed, the mechanical model of composite roof roadway destruction is established, and the failure mechanism of roadway is researched. The maximum stress position of such roadway roof is the shoulder angle of the roadway or the middle of the roof. Based on the failure mechanism of the compound roof roadway, the principle of strengthening the surrounding rock support with the help of the top and the bottom of the coal roadway in soft composite roof is proposed.