岩质边坡动力稳定性分析的几个要点  

SEVERAL POINTS IN DYNAMIC STABILITY ANALYSIS OF ROCK SLOPE

作　　者：李宁[1,2] 姚显春[1] 张承客[1] 

机构地区：[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

出　　处：《岩石力学与工程学报》2012年第5期873-881,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50879068);国家自然科学基金创新群体项目(40821001)

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。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 of slope reinforcement measures（mainly anchor cables） under dynamic loads. Based on long-term engineering experiences and researches, assessment methods for dynamic stability of slopes are discussed, especially 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.

关 键 词：边坡工程 岩质边坡 动力荷载 稳定性 预应力锚索 

分 类 号：P642.2[天文地球—工程地质学]