凤滩水电站扩建工程进水口反倾层状结构边坡岩体特征与加固处理

THE INTAKE SLOPE OF THE ENLARGEMENT PROJECT OF FENGTAN HYDROPOWER STATION: GEOLOGICAL FEATURES AND STABILIZATION

凤滩水电站扩建工程进水口边坡为厚层反倾结构边坡,岩体完整性好,由于边坡及进水口段洞室开挖未及时支护,导致进水口段上部边坡岩体产生轻微倾倒变形。本文描述了该进水口部位的地质条件,分析了进水口隧洞上部厚层反倾岩体稳定性。研究了施工过程中岩体发生轻微倾倒变形的原因,并提出了相应的加固处理方案,通过现场监测证明处理后边坡岩体是稳定的。

The intake slope of enlargement project of Fentan Hydropower Station is a thick - layered slope of good quality that dips backward. However, slightly toppling deformation occurred on the slope over the intake tunnels because of unsupported excavation of the slope and intake tunnels. This paper described the engineering geological conditions associated with the intake slope and analyzed stability of the thick - layered rock slope over the intake tunnels. The causes for slightly topphng due to excavation were analyzed and appropriate stabilization measures proposed. The field monitoring data show that the rock slope was stable after treatment.