江坪河水电站溢洪道洞室及出口边坡稳定性分析  

Stability Analysis of Spillway Chambers and Export Slope in Jiangpinghe Hydropower

作　　者：党莉[1] 程壮[1] 董艳华[1] 

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,443002

出　　处：《灾害与防治工程》2012年第1期13-18,共6页Disaster and Control Engineering

摘　　要：江坪河水电站洞室群洞段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。以溢洪道①为例，采用赤平投影法和块体计算程序（Unwedge、Swedge），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：溢洪道①的溢0＋460～溢04-490洞段和0＋500～溢04-550洞段，结构面组合出现安全系数较小，块体方量较大，建议加大衬砌厚度，采用间距为0．5～1．0m的钢拱架支护，以预应力锚索和系统锚杆加固，使洞室抗滑安全系数能满足规范要求；溢洪道①的出口边坡关键块体安全系数均大于规范要求值1．15，由此判断其出口边坡较稳定。Cavern section and outlet slope of Jiangpinghe Hydropower Station caverns de- velop structure faces. Mutual combination of differently shaped fracture surfaces controls the cavern stability. Taking spillway@as an example, the paper, by using stereographic projection and block calculation program （ Unwedge, Swedge ） analyzes cavern stability under the combination of different structural planes. The results showed that： in the hole section with overflow 0q-460 ~ 0q-490 and 0q-500 ~ 0q-550 of tunnel of spillway, structural plane combination safety coefficient is small, and the volume is large. It is sug- gested that the lining thickness should be increased and steel arch with 0. 5m - 1. 0m space should be used for support. Prestressed anchor cable and anchor reinforcement system should be added so that the sliding safety factor of cavern sidewall can meet the requirements of specification. Key block safety factor of the export slope in the spillway （1）is greater than 1.15 of the specifications value, so the export slope is stable.

关 键 词：赤平投影法 块体稳定性 有限差分法 

分 类 号：P642.22[天文地球—工程地质学]