摘要
为增强锚定板锚固系统的抗拔承载力,提出串联式锚定板锚固系统。基于FLAC3D有限差分软件,建立串联式竖向矩形双锚定板与土体相互作用的有限差分模型;基于粉质黏土室内三轴试验结果,获得考虑土体应变软化时,塑性剪切应变因子与塑性剪应变的关系;研究土体应变软化、前后锚定板间距、锚定板埋深对锚固系统抗拔性能的影响。研究结果表明:为避免前后锚定板相互影响而降低锚固系统的承载能力,前后锚定板的间距不得<3倍锚定板边长;当锚定板埋深<5倍锚定板边长,锚固系统的破坏模式为非对称破坏模式,呈现出浅埋锚定板破坏特征;锚定板埋设深度>5倍锚定板边长,锚固系统的破坏模式为对称破坏模式,表现为深埋锚定板破坏特性;当锚定板位移达到约10mm时,锚定板周围土体将出现应变软化现象。土体应变软化会降低锚定板锚固系统的抗拔承载力。
In order to improve the pulling capacity of anchored plate anchorage system,series anchored plate anchorage system is proposed.Based on FLAC3D finite difference software,a finite difference model of the interaction between a series vertical rectangular double anchor plate and soil is established.Based on the results of laboratory triaxial tests on silty clay,the relationship between the plastic shear strain factor and the plastic shear strain is obtained,when considering the soil strain softening.The effects of soil strain softening,distance between front and rear anchor plates and buried depth of anchor plates on pulling performance of anchorage system were studied.The results show that the distance between front and rear anchor plates should not be less than 3 times the length of anchor plates in order to avoid the influence of front and rear anchor plates on each other and reduce the bearing capacity of the anchoring system.When the anchor plate buried depth is less than five times the anchor plate length,the failure modes of anchorage system for asymmetric failure mode,shows the characteristics of small buried anchor plate damage;The embedment depth of anchor plate is more than 5 times the side length of anchor plate,and the failure mode of anchoring system is symmetrical failure mode,which shows the failure characteristic of deep embedment anchor plate.when the displacement of the anchor plate reaches about 1Omm,the soil around the anchor plate will appear strain softening.The strain softening of soil will reduce the pulling capacity of the anchored plate anchorage system.
作者
邹希全
刘杰
马越
ZOU Xiquan;LIU Jie;MA Yue(School of Civil Engineering,Hunan University of Technology,ZZhuzhou412007,HunanChina)
出处
《上海建材》
2023年第3期18-23,共6页
Shanghai Building Materials
基金
国家自然科学基金资助项目(51978260)。
作者简介
邹希全(1999-),男,硕士研究生,主要研究方向为挡土结构与土相互作用;通信作者:刘杰(1963-),男,博士,教授,主要研究方向为地基处理及边坡工程。
