关键词: 龙羊峡水电站, 龙西滑坡体, 高水位运行期, 变形特征分析

Abstract: The main precursors of the landslide destabilization are continuous expansion of the tension crack at rear edge and continuous deformation of the landslide. During high water level operation of Longyangxia hydropower station since 2005, the observed values of measuring points of the landslide body leveling and the cave leveling have risen to different degree and the crack at rear edge of the landslide body has also expanded.
In order to grasp the deformation law of Longxi landslide and determine the stabilization state correctly, the authors have comprehensively analyzed the geological conditions, deformation and failure characteristics of landslide and monitoring data. And the conclusion has been obtained that the deformation rate of Longxi landslide is basically stable, and there is no obvious widening and extension in most of tension cracks on the trailing edge. By now, Longxi landslide is in stable state. Except some smallscale collapse near the reservoir bank, bank slope recession and the formation of new underwater accumulation, there is no sign of large volume slipping of the landslide. How the raise of observed leveling values influence the stability of Longxi landslide is not clear yet.

Key words: Longyangxia hydropower station, Longxi landslide, high water level operation period, deformation characteristics analysis