摘要
为探究柔性防护下边坡的受力特性,设计并制作了加筋三维网–锚杆防护下的土质边坡模型,在模型内外设置了土压力盒、轴力计、百分表等元器件,通过在坡顶施加分级均布荷载,测试边坡的应力、变形和锚杆轴力的发展规律,并讨论边坡柔性防护结构的作用机制。结果表明:在坡顶超载作用下,边坡模型的变形与承载力依次经历了弹性压密、承载力发展和屈服破坏3个阶段;边坡坡面的侧向变形模式先是"中上部内凹、下部外凸"形,再随荷载增加转变为"整体外凸"式;边坡内部的侧向变形主要出现在靠坡面的中上部区域,其变形等值线呈圆弧状;坡面的竖向变形主要出现在边坡中上部,坡体内部的竖向变形主要出现在加载区的正下方;在坡顶超载作用下,上部锚杆的作用先发挥,受力也大于中下部的锚杆;锚杆强度宜采用渐进式设计。
In order to explore the mechanical characteristic of slope under flexible protection,the soil slope model under reinforced three-dimensional mat-anchor protection was designed and made.The earth pressure cells,axial force sensors,dial indicators and other components were set inside and outside the model.Various stages of uniform loads were applied to the top of slope to test the development of stress,deformation and anchor axial force.Finally,the mechanism for flexible protected slope was discussed.The results show that the deformation and bearing capacity of slope under overloading condition have experienced three stages,which is elastic compression,bearing capacity development and yield failure.The lateral displacement mode of the slope surface was firstly“concave in the middle-upper part,convex in the lower part”,and then changed to“integral convexity”with the increase of load.The lateral deformation of the inner slope was mainly distributed near the middle-upper part of the slope surface,and the deformation contour was in circular-arc shape.The vertical deformation of the slope surface mainly occurred in the upper middle part of the slope.The vertical deformation of the inner slope mainly distributed directly below the loading zone.Under overloading on slope top,the upper anchor worked first,and its force was also greater than that of the middle and lower anchors.The strength design of the anchor should be in a progressive way.
作者
何矾
刘泽
陈丽
楼华锋
HE Fan;LIU Ze;CHEN Li;LOU Huafeng(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China;Zhejiang Provincial Institute of Communications Planning,Design and Research,Hangzhou,Zhejiang 310031,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2020年第S01期2665-2673,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
浙江省交通科技项目(2017028)
浙江省建设科技项目(2018K050)
湖南省研究生科研创新项目(CX2018B665)。
关键词
边坡工程
柔性防护
加筋三维网
锚杆
模型试验
slope engineering
flexible protection
reinforced three-dimensional mat
anchor
model test
