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Quantitative hazard assessment of rockfall and optimization strategy for protection systems of the Huashiya cliff, southwest China

机译：中国西南部华达亚悬崖保护系统岩土岩土的定量危害评估

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摘要

Frequent rockfall events at the Huashiya cliff near the dam site of Jinsha Hydropower Station poses great threats to construction projects along the Jinsha River. In order to protect the construction area, a comprehensive analysis of rockfall hazard was carried out including field survey, numerical simulation, quantitative assessment and mitigation strategy. High resolution Digital Terrain Model (DTM) was created by Terrestrial Laser Scanning (TLS), then used for the identification of rockfall sources and simulation of rockfall run-out behaviours. Approximately 60 rockfall simulations were conducted to analyze the interaction between rockfall block and protection nets. Quantitative assessment of rockfall hazard was then made to visualize the distribution and hazard of rockfall. The difference between the 60 rockfall simulations was quantified through Rockfall Interception Ratio (RIR) and the Energy Ratio of Overflying Rockfall (EROR). By integrating RIR, EROR and cost, the performance of protection measures were quantitatively assessed. Then, an optimization strategy was proposed to improve the cost-efficiency of the protection system. At the end of this paper, some problems that can be encountered when creating DTM and hazard maps were discussed, and some advices for designing passive protection system were introduced.
机译：Huashiya悬崖附近的古山水电站大坝现场频繁的岩石活动对金沙河沿岸建设项目构成了巨大的威胁。为了保护建筑面积，对岩石危害进行全面分析，包括现场调查，数值模拟，定量评估和缓解策略。高分辨率数字地形模型（DTM）由地面激光扫描（TLS）创建，然后用于识别岩石源和岩石流出行为的仿真。进行了大约60个岩石模拟，以分析岩石块和保护网之间的相互作用。然后使岩石危害的定量评估是为了可视化岩石的分布和危险。通过岩石截取比（RIR）和超越岩石（ROR）的能量比量化了60个岩石模拟之间的差异。通过整合RIR，ROR和成本，定量评估保护措施的性能。然后，提出了一种优化策略来提高保护系统的成本效率。在本文结束时，讨论了在创建DTM和危险地图时可以遇到的一些问题，并介绍了设计被动保护系统的一些建议。

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