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主管单位 中华人民共和国
工业和信息化部
主办单位 哈尔滨工业大学 主编 冷劲松 国际刊号ISSN 0367-6234 国内刊号CN 23-1235/T

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引用本文:刘俊伟,王明明,凌贤长,黄孝义,李晓玲.桩-砂土界面循环弱化宏细观机制[J].哈尔滨工业大学学报,2019,51(2):146-153.DOI:10.11918/j.issn.03676234.201801049
LIU Junwei,WANG Mingming,LING Xianzhang,HUANG Xiaoyi,LI Xiaoling.Macroscopic and microscopic mechanism of cyclic degradation behavior on pile-sand interface[J].Journal of Harbin Institute of Technology,2019,51(2):146-153.DOI:10.11918/j.issn.03676234.201801049
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桩-砂土界面循环弱化宏细观机制
刘俊伟1,2,王明明1,凌贤长3,黄孝义1,李晓玲1
(1.青岛理工大学 土木工程学院,山东 青岛 266033; 2.海岸和近海工程国家重点实验室(大连理工大学),辽宁 大连 116024; 3.哈尔滨工业大学 土木工程学院,哈尔滨 150090)
摘要:
循环荷载下桩-土界面研究是桩土体系相互作用的重要研究方向,循环荷载下桩-土界面弱化效应主要包括界面剪应力循环弱化、界面法向应力循环弱化以及界面砂土颗粒破碎机制3部分,三者彼此影响共同制约桩-土界面的承载性能.界面粗糙度是影响桩-土界面力学机制的重要影响因素,为此,利用自主研发的可视化恒刚度界面剪切仪结合数字图像技术(DIC),研究不同界面粗糙度下桩-土界面循环弱化效应的宏细观机制.结果表明,界面剪应力、法向应力与剪切位移关系曲线分别呈“滞回环”和“碟”状发展;相同粗糙度下,界面剪应力、法向应力随循环次数的增加呈对数型弱化,界面粗糙度越大弱化系数越大;应力路径曲线呈“蝴蝶环”状发展,界面摩擦角随着界面相对粗糙度的增加而增大;界面剪切带随剪切循环数和界面粗糙度的增加逐渐增厚,30个循环剪切后剪切带厚度稳定在(4~5)D50;剪切带内颗粒破碎明显,相对破碎率为1.86%~10.25%,随粗糙度增大而增大.
关键词:  桩-土界面  恒刚度剪切  循环弱化  数字图像相关技术  颗粒破碎
DOI:10.11918/j.issn.03676234.201801049
分类号:TU378.2
文献标识码:A
基金项目:国家自然科学基金(4,8);山东省重点研发计划(2017GSF20107);大连理工大学海岸和近海工程国家重点实验室开放基金(LP1712);青岛市应用基础研究项目(16-5-1-34-jch);住房和城乡建设部科学技术计划项目(2014-K3-026);泰山学者工程专项经费资助(鲁政办字〔2015〕212号);乌鲁木齐市建设科技项目(2016002);乌鲁木齐地铁1号线三标科技项目(2016-1-3)
Macroscopic and microscopic mechanism of cyclic degradation behavior on pile-sand interface
LIU Junwei1,2,WANG Mingming1,LING Xianzhang1,HUANG Xiaoyi1,LI Xiaoling1
(1.School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China; 2.State Key Laboratory of Coastal and Offshore Engineering (Dalian University of Technology), Dalian 116024, Liaoning, China; 3.School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)
Abstract:
The study of pile-soil interface under cyclic loading is an important research direction of pile-soil interaction. The degenerate effects of pile-soil interface under cyclic loading consist of degenerate shear stress, degenerate normal stress, and the breakage mechanism of sand particles, which interact with each other and control the bearing capacity of pile-soil interface. Interfacial roughness has important influence on pile-soil mechanical mechanism. Macroscopic and microscopic mechanism of cyclic degradation behavior on pile-sand interface under different interface roughness was researched by utilizing self-developed visual constant normal stiffness (CNS) interface shear apparatus combined with digital image correlation (DIC) measurement technology. The experimental results showed that the relation curves of shear stress and normal stress developed as “hysteretic loop” and “disk” shapes, respectively. Under the same roughness, the interfacial shear stress and the normal stress both degraded logarithmically with the increase of the numbers of the cycles, while this degradation rate increased with the increase of interfacial roughness. The stress path curve developed as a “butterfly ring” shape, and the friction angle increased with the increase of interfacial relative roughness. The interfacial shear band was gradually thickened with the increase of shear cycles and interface roughness, and this thickness reached about (4-5) D50 after 30 cycles. In addition, the particles in the shear band were significantly broken and the relative crushing rate was 1.86%-10.25%, which increased with the increase of interfacial roughness.
Key words:  pile-soil interface  constant normal stiffness shear  cyclic degradation  digital image correlation technology  particle breakage 〖FQ(+33mm。46,ZX-W〗收稿日期: 2018-02-22 基金项目: 国家自然科学基金(4,8)  山东省重点研发计划(2017GSF20107)  大连理工大学海岸和近海工程国家重点实验室开放基金(LP1712)  青岛市应用基础研究项目(16-5-1-34-jch)  住房和城乡建设部科学技术计划项目(2014-K3-026)  泰山学者工程专项经费资助(鲁政办字〔2015〕212号)  乌鲁木齐市建设科技项目(2016002)  乌鲁木齐地铁1号线三标科技项目(2016-1-3) 作者简介: 刘俊伟(1983—),男,博士,副教授  凌贤长(1963—),男,教授,博士生导师通信作者: 刘俊伟,zjuljw@126.com

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