相对密实度对钢-砂界面循环剪切弱化影响研究  

Effect of relative compactness on cyclic shear weakening of steel-sand interface

作　　者：陈健伟 刘俊伟[1] 国振[2] 陈建强[1] 寇媛媛 姜正璟 巩光磊 CHEN Jianwei;LIU Junwei;GUO Zhen;CHEN Jianqiang;KOU Yuanyuan;JIANG Zhengjing;GONG Guanglei(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China;Qingdao Haide Engineering Group,Qingdao 266100,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266525 [2]浙江大学建筑工程学院,杭州310058 [3]青岛海德工程集团股份有限公司,青岛266100

出　　处：《青岛理工大学学报》2023年第2期61-66,共6页Journal of Qingdao University of Technology

基　　金：山东省优秀青年基金资助项目(ZR2021YQ31)。

摘　　要：砂土的相对密实度对界面循环弱化具有重要影响。通过自主研发的大型界面环剪仪,开展了3种不同相对密实度砂土与钢板界面的循环剪切试验,研究相对密实度对循环弱化的影响。结果表明:相对密实度越大,相同循环下剪应力极值越大,法向应力越大,法向位移越小,最终剪缩量越小,砂土剪胀越明显,循环剪切的弱化作用越小,弱化到稳定状态需要的循环次数越多。The relative compactness of sand has an important influence on the cyclic weakening of interface.The cyclic shear tests of the interface between steel plate and sand with three different relative compactness were carried out by using a large-scale interface ring shear apparatus to study the effect of relative compactness on cyclic weakening.The results show that when the relative compactness increases,the extreme value of shear stress under the same cycle grows higher,the normal stress becomes bigger,the normal displacement decreases,the final shear shrinkage becomes smaller,the shear dilation of sand becomes more salient,the weakening effect of cyclic shear reduces,and it requires more cycles to reach a stable state.

关 键 词：界面剪切 循环弱化 室内试验 钢-砂界面 相对密实度 

分 类 号：TU411.7[建筑科学—岩土工程]