江坪河水电站洞室群及出口边坡处结构面发育,不同产状裂隙面相互组合,对洞室稳定性起控制性作用。以1号溢洪洞为例,采用赤平投影法和块体计算程序分析不同结构面组合下洞室和出口边坡的稳定性。结果表明,1号溢洪洞的溢0+460～溢0+490和溢0+500～溢0+550洞段,结构面组合出现安全系数较小、体积较大块体,建议加大衬砌厚度,采用间距为0.5～1.0 m的钢拱架支护,加设预应力锚索和系统锚杆加固,使洞室边墙抗滑安全系数能满足规范要求。1号溢洪洞的出口边坡关键块体安全系数大于规范要求值,由此判断其出口边坡较稳定。 The structural plane of cave group and outlet slope of Jiangpinghe Hydropower Station is developed, and the fractures of different producing areas combine with each other to play a controlling role in the stability of the cavern. Taking spillway No. 1 as an example, the stability of the cavern and exit slope under different combinations of structural planes is analyzed by using the stereographic projection method and the block calculation program. The results show that the overflow of 0 # 460 ~ 0 + 490 and the 0 ~ 500 ~ 0 + 550 # section of No. 1 spillway have a smaller safety factor and larger volume of blocks, so it is suggested to increase the lining The thickness is supported by a steel arch frame with a spacing of 0.5-1.0 m. Reinforcing the prestressed anchor cable and the system anchor bar to reinforce the safety coefficient of anti-sliding of the sidewall of the cavern to meet the requirements of the code. The safety factor of the key blocks at the exit slope of No.1 spillway is larger than the required value of the standard, so that the outlet slope of the outlet spillway is more stable.