西南某电站右岸开挖边坡稳定性的FLAC~(3D)分析

西南某大型水电站引水发电洞进水口边坡顶部在开挖过程中出现带状裂缝 ,引起了多方的极大关注。在对该边坡系统的地质调查基础上 ,确立了其变形破坏模式 ;通过FLAC3D模拟开挖过程 ,客观地验证了实际开挖过程中边坡的变形及其顶部平台出现的裂缝 ;并预测了在采取加固措施后边坡内部变形趋势。经计算 ,开挖面临空方向最大位移量达到 5 .4cm。此后 ,经过有效的锚固处理 ,边坡经过变形和应力的调整 ,总体上趋于稳定 ,为确保进水口隧洞的顺利开挖提供了科学依据

A FLAC~(3D) ANALYSIS OF THE SLOPE STABILITY AT A HYDROPOWER STATION

Bands of clefts appeared on the top of the water-entrance hole at a southwestern hydropower station during the excavation attracted lots of attention. Based on in situ investigation, the authors characterized the failure mode and simulate the excavation process using the FLAC~(3D). The results of calculation indicate the displacement of the slope and verify the development of the bands of clefts. The model also predicted the distribution of displacements within the slope after reinforcement. The results indicate that the maximum displacement in X direction amounts up to 5.4cm. With the effective anchoring reinforcement the slope reaches its stability by adjusting the stress and strain.