溪洛渡水电站的拱肩槽开挖高边坡最高约250 m, 进 水口开挖高边坡最高约160 m,其稳定性是复杂的空间问题。通过对拱肩槽及进水口边坡的应力场、位移场和破坏区域模拟计算表明: 拱肩槽、进水口边坡在拟订的开挖坡比条件下整体 均处于稳定状态。边坡局部稳定性分析表明: 拱肩槽、进水口边坡均存在不同程度的不稳定 性块体，对边坡开挖施工和后期工程运行存在不同程度威胁。针对研究中发现的上述问题提 出了相应的处理措施。

The spandrel groove excavation of the Xiluodu Hydropo wer Station forms a slope of 250 m high, whose stability is a complicated space problem. The system calculation and analysis on stress field, displacement field and failure zone indicate the high rock slope of spandrel groove and water inle t are stable if they are excavated in the designed slope ratio. The local stabil ity analysis on the rock slope indicates there exist unstable rockmass blocks in the rock slope of spandrel groove and water inlet which have different level th reats to the excavation and operation of the slope. The relevant steps have been put forward to solve the problems about the stability of the slopes of the span drel groove and water inlet.