地震动特征对岩体边坡动力响应的影响  

Influnce of Ground Motion Parameters on Dynamic Responses of Rock Slope

作　　者：刘贵应 梁庆国[2] 韩文峰[3] 

机构地区：[1]中铁二院重庆勘察设计研究院有限责任公司,重庆400023 [2]兰州交通大学土木工程学院,兰州730070 [3]天津城市建设学院土木工程系,天津300381

出　　处：《地下空间与工程学报》2012年第1期205-211,共7页Chinese Journal of Underground Space and Engineering

基　　金：中铁二院"西南地区铁路层状岩石边坡抗震优化技术研究"资助项目;兰州交通大学"青蓝"人才工程基金(QL-08-19A)

摘　　要：岩体边坡在地震动荷载作用下的变形破坏过程受岩体介质和结构特征、赋存环境和动荷载特征的控制,是这三类因素共同作用的结果。结合松动岩体和强震极震区地震动的研究成果,应用数值分析的方法研究了在不同地震动峰值、频率和加载方向情况下,岩体边坡的动力响应。结果表明,岩体中的动力响应随动荷载的峰值的增加和频率的降低而显著增大,双向加载的动力响应远大于单向加载;岩体动力响应表现出极大的不均匀性;分析了其机理和数值模拟研究的局限性,提出物理模拟和现场调研资料的积累和定量化研究是解决岩体地震动力破坏问题的关键。The dynamic failure process of rock mass slope under seismic forces might have some relationship with the coupled effects of material ＆ structure ＇of rock mass, local stress, seepage ＆ temperature fields and charac- teristics of ground motion, The dynamic responses of rock slopes under ground motion with different amplitudes, fre- quencies ＆ loading orientations were analyzed through numerical simulation with,the consideration of researches on loose rock mass and strong motion at the meizoseismal area of strong earthquakes. The results indicated that the re- sponses of rock slopes increased with the increasing dynamic load peak and decreasing frequency of ground motion, and the vertical ground motion had significant impact on the rock deformation and failure. Non-uniformity of deforma- tion and failure would be the most significant characteristics of rock slopes caused by ground motion. The mechanism and limitations of above results were also discussed using data from static mechanics and elastic wave theory. The key to dynamic failure of rock mass is to accumulate more data from physical simulations ＆ site investigations and then to carry out quantitative analysis and evaluation.

关 键 词：岩体力学 地震动 动力响应 频率 不均匀性 

分 类 号：TU452[建筑科学—岩土工程]