摘要
受周围土体约束的空间效应,边坡破坏常呈现三维特征。采用模型试验对顶部压载下三维边坡的破坏机制和滑动面特征进行研究。试验考虑了坡面形态(平、凸、凹)和坡体初始含水率的影响,通过坡顶加载分力板,触发边坡模型失稳破坏。采用位移计和土压力盒分别记录坡顶位移和坡内土压力的变化。利用白砂层测量方法找到临界滑动面位置,获取滑面立体形态,分析了边坡破坏的产生、发展、失稳。试验结果表明:坡面形态对滑动特性影响很大,相同坡角下凹坡能承受最大的顶部荷载,平坡次之,凸坡最小。边坡均为浅层破坏,凹坡滑面深度最浅,平坡最大,破坏有明显的三维效应。含水率高的边坡承受的顶部荷载和滑面深度均小于含水率低的边坡。
Slope failure often shows three-dimensional feature because of spatial effect constrained by the surrounding soil.A model test was performed to study failure mechanism and the sliding surface characteristics of 3D slope.The effect of slope geometry(flat,convex and concave)and initial water content were considered.The failure of slope was induced by load at the slope crest.Top displacement and soil pressure of slope was recorded by LVDT and earth pressure cells,respectively.The location and shape of sliding surface was measured by sand layer measurement method.The failure process of 3D slope were analyzed.The geometry of slope had a great influence on sliding characteristics.With the same slope angle,the concave slope can bear the maximum load,and the flat slope can bear higher load than the convex slope.Sliding surface of slope shows shallow landslide.The concave slope sliding surface is the most shallow,and the flat slope sliding surface is the deepest.The form of slope failure is three dimensional.With a higher water content,slope can bear lower load and the sliding surface is more shallow.
作者
方兴杰
王建华
FANG Xing-jie;WANG Jian-hua(Department of Civil Engineering,Shanghai Jiaotong University,Shanghai 200240,China)
出处
《科学技术与工程》
北大核心
2018年第19期113-119,共7页
Science Technology and Engineering
基金
国家自然科学基金(51422905
51578189)资助
关键词
三维边坡
模型试验
稳定性
滑动面
three dimensional slope
model test
stability
sliding surface
