溪洛渡白铁坝堆积区深部变形监测可视化分析

针对金沙江溪洛渡水电站左岸谷肩堆积体自铁坝堆积区削坡范围I至V区，进行深部变形监测资料的三维可视化分析．依据工程地质资料建立堆积体监测区域的三维地质模型，进而基于三维地质模型对测斜孔位置进行虚拟钻孔取样，进行虚拟取样岩芯与测斜孔孔深变形曲线综合分析，揭示堆积体的滑移错动带位置及分布规律．绘制监测物理量数据场三维云图，分析深部变形监测数据场的空间分布特征，研究堆积体的变形破坏模式．结果表明：白铁坝堆积区深部水平位移主要表现为向河谷中心和下游方向，垂直位移主要表现为下沉，该区域由二次削坡开挖区向上部表现出牵引式滑动变形，从变形速率来看，变形较削坡初期有明显减缓趋势，但尚未收敛，需加强监测以保证左岸谷肩堆积体的稳定和电站进水口的安全．

Visualization Analysis of Deep Deformation Monitoring in Baitieba Accumulation Zone of Xiluodu Hydropower Station

For studying the deformations and failure modes of the accumulation slope of Baitieba accumulation zone cutting slope range from I to V located at left riverbank of Xiluodu hydropower station at the Jinshajiang River, a three-dimensional model of accumulation slope monitoring zone is established. According this model, the virtual drilling sampling of the dip holes is carried out for analyzing synthetically the virtual sampling of core and the deep deformation curve of dip holes, which reveals the accumulation slope position of sliding in- terface and their distribution rules. By drawing data field three-dimensional nephograms of monitoring physi- cal quantities, the spatial distribution characteristics of the deep deformation monitoring data field is analyzed. The results show that the horizontal displacements of the Baitieba accumulation zone is mainly to valley center and to the downstream~ the vertical displacement is mainly sinking~ this zone is retrogressive sliding deforma- tion from the excavation zone of the second cutting slope to the upper part, and the deformation, in terms of speed, has an obvious slowing tendency comparing with the early days of cutting slope~ but it is no conver- gence~ in order to guarantee stability of the left shoulder accumulation slope and safety of the water intake ofhydropower station, there need to enhance monitoring the deep deformations.