金安桥水电站枢纽建筑物边坡工程设计

Side Slope Design of Complex Structures in Jin＇anqiao Hydropower Station

金安桥水电站工程规模巨大，枢纽区地质条件复杂，坝前有B1崩塌堆积体，体积约246×104m^3；坝下游有B2、B20崩塌堆积体，体积分别约84×104m^3、226×104m^3；建筑物开挖边坡高，稳定性差。通过分析边坡与各建筑物的关系并参照有关规范和已建工程的经验，提出了边坡的安全控制标准；通过对边坡稳定初步计算和反演分析，修正了岩体的地质力学参数；通过边坡失稳模式判别和多种方法的边坡稳定分析，提出了边坡的综合加固处理措施，从而解决了枢纽区复杂地质条件下的高边坡稳定和支护问题。

Jin＇anqiao Hydropower Station is in a large scale and its geological conditions are quite complicated. In front of dam, there is a collapse named B1 with a volume of 246×104m^3. At downstream area of the dam, there are collapses of B2 and B20 with respective volume of 84×104m^3 and 226×104m^3 respectively. Side slope to be excavated is high with poor stability. Through analysis on relationship between side slopes and its structures, the safety control criterion of side slopes is put forward according to the relevant codes and experiences obtained from the completed projects. Meantime, the geological mechanical parameters are revised by means of slope stability of initial computation and inversion analysis. Through the judgment of slope failure mode, 2D or 3D limit equilibrium analysis and planar finite methods are carried out. The comprehensive stabilizing treatment measures for side slope are given, thus the complicated stability and supporting issues of high side slopes under complex geological conditions are effectively solved.