地震作用下含反倾软弱夹层斜坡的动力变形破坏特征研究  

Dynamic deformation and failure of slopes with an anti-dip weak interlayer under earthquakes

作　　者：杨峥[1] 许强[1] 刘汉香[1] 王龙[2] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059 [2]四川省交通运输厅交通勘察设计研究院,成都610017

出　　处：《振动与冲击》2014年第19期134-139,151,共7页Journal of Vibration and Shock

基　　金：国家重点基础研究计划(2013CB733200);国家杰出青年科学基金(41225011);教育部长江学者特聘教授岗位资助

摘　　要：采用振动台模型试验,研究了地震作用下含反倾软弱夹层的斜坡的动力变形破坏特征和破坏过程。试验结果表明:1地震动作用下斜坡的变形和破坏特征与地震波类型、加载方向、振动强度有关,同时还与斜坡所含软弱夹层的厚度和坡体高程等因素有关。2含反倾软弱夹层的斜坡在地震动作用下为"震裂-散体崩落"型破坏,坡面裂缝起主要的控制作用,并且具有沿坡面裂缝呈带状散体崩落的特点。其变形破坏集中在坡体的中上部,这与坡面水平加速度在该部位被显著放大有关。3相比薄软弱夹层,厚软弱夹层在震动过程中表现出一定的消能、减震作用。The characteristics of dynamic deformation and failure process of slopes with an anti-dip weak interlayer under earthquakes were studied with shaking table model tests.Test results showed that the deformation and failure process of slopes under earthquakes are related not only to types,loading direction and vibration intensity of earthquake waves,but also to elevation of slopes and thickness of weak interlayer;slopes with an anti-dip weak interlayer fail in the mode of “crack-shatter collapse”under earthquakes with the characteristics of band-like collapse mainly controlled by cracks on slopes’ surface,deformation and failure concentrate on the upper part of slopes due to the significant amplification of the slope horizontal acceleration over there;compared to the thin weak interlayer,the thick one plays an important role in energy dissipation and shock absorption during shakings.

关 键 词：斜坡 振动台模型试验 软弱夹层 变形破坏特征 

分 类 号：TU435[建筑科学—岩土工程]