西南某大型水电站拱肩槽边坡开挖的变形响应研究

对在复杂地质条件和高地应力环境下，高达近330m的人工岩石拱肩槽高边坡的研究，尤其是在大坡比、强开挖条件下所表现的变形响应规律的研究具有重要的理论与现实意义。论文通过大量现场跟踪施工的地质调查工作和利用丰富的监测资料的基础上，系统地研究了此类边坡变形响应的基本规律及特殊表现，得到了拱肩槽高边坡开挖过程中，边坡的变形与开挖过程有较强的同步性。变形主要受开挖卸荷影响；随开挖的进行，坡体的变形随开挖面的远离表现出总体衰减的特征等。开挖后的坡体的变形量较小，变形深度较浅，而且在开挖12~18个月后，变形趋于稳定。这些结论对类似边坡开挖及其稳定性的控制具有重要的借鉴意义。

DEFORMATION RESPONSE OF HIGH ROCK SLOPE EXCAVATION AT A LARGE HYDROELECTRIC STATION IN SOUTHWEST CHINA

The excavation and stability of hundred meters high rock slopes in water conservancy project construction are of important technical issues . This paper bases on the abundant geological investigation of a construction site and examines the associated cut slope with height of 330 m in a large Hydroelectric Station in southwest China. The reactive deformation of the high rock slope with great sloping ratio is studied under the condition of complex geological conditions and high in-situ stresses. The study is systematical. The basic laws and special characteristics of the deformation responses are acquired and can be classified as follows: (1) During the slope excavation, there is a strong synchronism between the slope deformation and its excavation process. (2) The high slope deformation is mainly influenced by excavation. (3) The slope deformation generally is weakened as increase of the distance between the excavation plane and the monitoring position. Immediately after its formation, the cut slope had small deformation and the deformed depth was also shallow. After having been excavated for 12 to 18 months, the cut slope was stable. The findings are helpful to the design and construction of similar high cut slopes.