江坪河水电站溢洪洞洞室及出口边坡稳定性分析  

Stability Analysis of Spillway Tunnel and Its Outlet Slope in Jiangpinghe Hydropower Station

作　　者：党莉[1] 程壮[1] 董艳华[2] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《水力发电》2012年第10期21-23,共3页Water Power

摘　　要：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 planes of rock mass around caverns and outlet slopes in Jiangpinghe Hydropower Station are developed, and the combination of fractures with different occurrence will control the stability of caverns and slopes. Taking the No.1 spillway tunnel as an example, the stabilities of tunnel and its outlet slope under different fracture combinations are analyzed by using stereographic projection and block calculation program. The results show that there are unstable surrounding rocks with smaller stability coefficient and larger volume in sp. 0＋460-sp. 0＋490 and sp. 0＋ 500-sp. 0＋550 of tunnel. It is suggested that the measures of increasing lining thickness, supporting by steel arch with a spacing of 0.5-1.0 m, and adding pre-stressed anchor cable and anchor reinforcement system are taken to improve the safety factor against sliding of sidewall for meeting the requirements of specification. The safety factors of key blocks in the outlet slope of No.1 spillway tunnel are greater than the requirements of specification, and show that the outlet sloper is stable.

关 键 词：赤平投影法 有限差分法 稳定 边坡 溢洪洞 江坪河水电站 

分 类 号：TU457[建筑科学—岩土工程]