岩质边坡锚索动力承载特性.DOC

岩质边坡动力稳定性分析的几个要点 李 宁1，2，姚显春1，张承客1 (1. 西安理工大学 岩土工程研究所，陕西 西安 710048；2. 中国科学院寒区旱区环境与工程研究所 冻土工程国家重点实验室，甘肃 兰州 730000) 摘要：重点讨论动荷载作用下岩质边坡稳定性的3个基本问题：(1) 动荷载作用下裂隙岩体的力学特性；(2) 边坡动力响应及安全评价；(3) 边坡加固措施(主要指锚索)在动力荷载作用下的安全性问题。在总结多年来的工作经验与研究积累的基础上，探讨边坡动力稳定性评价方法，特别是对于在地震、爆破动荷载作用下，岩质高边坡稳定性的安全评价；总结提出岩体在动荷载作用下的强度特性与研究重点；系统分析岩质边坡的动力响应；提出从动安全系数走向、潜在滑动面的动态开裂和滑移及边坡关键点的质点振动速度3个方面来评价边坡动力稳定性的思路与方法；最后就如何评价边坡预应力锚索加固措施在动荷载作用下的安全性提出科学的设计原则与评价指标。 关键词：边坡工程；岩质边坡；动力荷载；稳定性；预应力锚索 中图分类号：P 642.2 文献标识码：A 文章编号：1000–6915(2012)05–0873–09 SEVERAL POINTS IN DYNAMIC STABILITY ANALYSIS OF ROCK SLOPE LI Ning1，2，YAO Xianchun1，ZHANG Chengke1 (1. Institute of Geotechnical Engineering，Xi(an University of Technology，Xi(an，Shaanxi 710048，China； 2. State Key Laboratory of Frozen Soil Engineering，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China) Abstract：Emphasis is put on discussions of three basic problems in dynamic stability analysis of rock slope：(1) mechanical characteristics of fractured rock masses under dynamic loads；(2) dynamic response and safety assessment of slope；(3) safety evaluation slope reinforcement measures(mainly anchor cables) under dynamic loads. Based on long-term engineering experiences and researches，assessment methodspecially for high rock slopes under seismic and blasting loads. The strength characteristics and research emphasis for rock masses under dynamic loads are summarized and put forward. The dynamic responses of rock slope are analyzed systematically. It is pointed out that the dynamic stability of rock slopes should be assessed from three aspects，i.e. the trend of dynamic factor of safety，the dynamic fracturing and sliding of potential sliding surface，and the particle vibration velocity of key points in slopes. Finally，the security assessment of prestressed anchor cables under dynamic loads is proposed. Key words：slope engineering；rock slope；dynamic loads；stability；prestressed anchor cable