龙羊峡近坝库岸滑坡群稳定性分析及预警技术研究

通过对龙羊峡水库蓄水前后边坡地质环境的长期监测,将库岸变形破坏分为完整地层岸坡和滑坡堆积体岸坡的破坏形式,对高库水位条件下的库岸稳定性进行了计算.在计算分析的基础上,对汛限水位抬高至2594m后岸坡的可能的失稳方式、下滑量和潜在失稳边坡涌浪高度进行了评价.结果表明:在2594 m库水位时,可能失稳的为龙西边坡;在2600 m库水位时,可能失稳的为龙西和农场边坡;可以龙西和农场边坡300万m3下滑量作为坝库岸滑坡涌浪高度的评价标准,在此期间确定汛期运行水位时可预留3~4 m的涌浪高度.

Stability analysis and early-warning technology of landslides near Longyangxia Dam

Through long-time monitoring of the geological environment of slopes before and after the impounding of the Longyangxia Reservoir,the deformation failure modes of the reservoir bank can be classified as either a failure composed of complete stratum or a failure composed of landslide accumulation.The stability of the reservoir bank under high water level conditions is calculated and analyzed.When the limited water level in flood season is 2 594 m,the possible glide manner after losing stability of landslide is analyzed,and the glide quantity and surge height caused by potential landslides are predicted.The results show that the Longxi slope may be unstable when the reservoir water level is 2 594 m, and both the Longxi and Nongchang slopes may lose their stabilities when the reservoir water level is 2 600 m.It is also indicated that 3 000 000 m3-glide quantity of Longxi and Nongchang slopes can be used as evaluation criterion of surge height,and that when determining operating water level during flood season,the surge height of 3-4 m can be preserved.