大渡河丹巴水电站坝址左岸危岩体发育规律与防治措施

Development Regularity and Prevention Measures of Unstable Rock Mass at the Left Bank of Dadu River Danba Hydropower Station Dam

危岩体的失稳不仅会给水电施工安全带来严重威胁,还可能造成枢纽区水工建(构)筑物的严重破坏,影响水电站正常运营。借助三维激光扫描技术,并通过精细的野外调查,查明大渡河上游丹巴水电站坝址区左岸危岩发育分布特征,通过与工程地质条件相关性分析,总结出危岩体的发育分布主要受地形地貌、岩体结构以及地层岩性的影响,并得出了危岩体发育的一般规律,最后结合危岩体稳定性及其威胁对象,同时考虑危岩体处治效果和施工的方便,以危岩片区为单元提出了相应的防治措施。

The destabilization of unstable rock not only pose a serious threat for hydroelectric construction secure, may also cause serious damage for hydraulic buildings in hub zone （ reconstruction）, affecting the normal operations of hydropower station. By using three dimensional laser scanning technologies, and through the fine field investigation, the characteristics of development and distribution of unstable rock mass at the left bank of the upper reaches of the Dadu River hydropower station dam in Danba, are ascertained. Through relevance analysis of engineering geological conditions, it summed up that the unsta- ble rock distribution is mainly affected by topography, rock mass structure and lithology, and the general rule of development for unstable rock is obtained. Finally from the stability and threat objects of unstable rock mass, meanwhile the treatment effect and construction convenience of dangerous rock mass are considered, with dangerous rock area as the basic unit, the corresponding prevention measures are put forward.