【摘要】 在汶川地震灾区,顺层陡倾斜坡是一类地震山地灾害非常发育的斜坡类型,而开挖往往加剧了斜坡的地震山地灾害。为了重现斜坡的变形破坏过程,分析斜坡在地震荷载作用下的变形破坏规律。选取平武县平通镇桑树坪滑坡所处斜坡作为顺层陡倾角开挖损伤斜坡的典型实例,进行地震荷载作用下变形破坏的室内物理模型试验。结果表明,开挖加剧了斜坡在地震荷载作用下的变形破坏。从破坏形式来看,顺层陡倾斜坡的坡变形破坏兼具崩塌和滑动二者特征,与野外调查结果吻合。从整个变形破坏过程来看,可以划分为以下阶段:a.地震初始阶段,此阶段开挖呈契形体岩层在地震作用下沿层面微小滑动,坡脚应力剧增;b.开挖岩层坡脚溃曲阶段;c.全面下滑阶段;d.岩层滑动受阻-倾倒阶段。更多还原

【Abstract】 In the Wenchuan earthquake,steep dip bedding slope is a kind of slope that seismic mountain disaster very development and the slope earthquake disaster is often exacerbated by the excavation.In order to reproduce the process and analysis regularity of slope deformation and failure under the action of seismic load.The author chooses San Shuping landslide located Pingwu County as the typical examples of steep dip excavation damage bedding slope,and the indoor physical model test of slope deformation and failure under the action of seismic load are carried out.The results show that slope deformation and failure is intensified by the excavation.Collapse and sliding is the main form of failure and the results consistent with the field investigation.From the whole process of deformation and failure of view,it can be divided into the four stages.First,the initial phase of the earthquake.A wedge rock by excavation small slides along the rock layers and the slope toe stress increase sharply under the action of seismic load in this stage.Second,rock layers by excavation break-bend at slope toe.Third,the rock layers by excavation overall decline stage.Last,the rock slide blocked and dumping.更多还原