不同埋置深度下的锚板抗拔特性试验研究  

Experimental study on pull-out resistance of plate anchors at different buried depths

作　　者：芮瑞[1] 肖风钰 程永辉[2] 高烽 胡胜刚[2] 丁锐恒 孙天健 RUI Rui;XIAO Fengyu;CHENG Yonghui;GAO Feng;HU Shenggang;DING Ruiheng;SUN Tianjian(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《岩土工程学报》2023年第10期2032-2041,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(42272315);长江水利委员会水利技术示范项目(SF-202201);国家级大学生创新训练项目(202210497084)。

摘　　要：锚板因其具有良好的承载特性而被广泛应用,然而不同埋置深度下的锚板承载特性存在差异。为研究锚板的抗拔承载特性,利用自主开发的可视化拉拔装置,考虑埋深和拉拔速率的影响进行锚板拉拔模型试验。通过粒子图像测速技术和测力计分别获取填料位移、剪应变云图与锚板拉拔荷载。试验结果表明:密砂中的锚板临界埋置比约为4。浅埋锚板拉拔过程可分为峰前增长、峰后软化、残余稳定3个阶段,峰前增长阶段土体处于局部剪切破坏状态,峰后软化和残余稳定阶段土体处于整体剪切破坏,位移与剪应变云图呈倒梯形分布。深埋锚板拉拔过程可分为峰前增长与峰后波动2个阶段,土体始终处于局部剪切破坏状态,位移云图呈气泡状分布,剪切面始终位于锚板上方3倍锚板宽度范围内。无量纲化荷载与无量纲化位移符合双曲线关系,给出了锚板承载力与位移关系式,并与其他研究结果做了对比。引入形状系数的修正Giampa公式能较好预测锚板承载力系数。The plate anchor is widely used because of its good bearing characteristics,but the bearing characteristics are different at different buried depths.In order to study the tensile bearing characteristics of the anchor plate,a self-developed visualized drawing device is used to conduct a drawing model test considering the influences of buried depth and drawing rate.The particle image velocimetry and the digital dynamometer are used to obtain the displacement and shear strain cloud map of packing soil and drawing load of the anchor plate.The results show that the critical buried depth ratio of the anchor plate in dense sand is around four.The drawing process of the shallow-buried anchor plate can be divided into three stages:pre-peak growth,post-peak softening and residual stability.At the pre-peak growth stage,the soil is in local shear failure state,while the soil is in the overall shear failure state at the post-peak softening and residual stability stages.The displacement and shear strain clouds are inverted trapezoidal.The drawing process of the deep-buried anchor plate can be divided into two stages:pre-peak growth stage and post-peak fluctuation stage.In this case,the soil is always in local shear failure,the displacement cloud is in bubble shape distribution,and the shear plane is always in the width of three times of the anchor plate above the anchor plate.The relationship between the dimensionless load and the dimensionless displacement is hyperbolic.This relationship is given and compared with other research results.The shape coefficient-modified Giampa formula can predict the bearing capacity coefficient of the anchor plate well.

关 键 词：模型试验 锚板 埋置比 抗拔承载力 破坏模式 

分 类 号：TU473[建筑科学—结构工程]