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浙江大学学报(工学版)
浙江大学学报(工学版)  2018, Vol. 52 Issue (6): 1123-1130    DOI: 10.3785/j.issn.1008-973X.2018.06.011
土木与交通工程     
循环荷载下砂与钢板界面的弱化机制
刘俊伟1,2, 朱娜1, 王立忠2, 尚文昌3
1. 青岛理工大学 土木工程学院, 山东 青岛 266033;
2. 浙江大学 水利工程博士后流动站, 浙江 杭州 310058;
3. 中铁华铁工程设计集团有限公司, 北京 100071
Degenerate mechanism of sand-steel interface under cyclic loading
LIU Jun-wei1,2, ZHU Na1, WANG Li-zhong2, SHANG Wen-chang3
1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China;
2. Post-doctoral Research Station of Hydraulic Engineering, Zhejiang University, Hangzhou 310058, China;
3. China Railway Engineering Group Co. Ltd, Beijing 100071, China
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摘要：

针对桩-土界面的循环弱化机制，采用自主研发的大尺度恒刚度界面剪切仪，进行不同剪切位移幅值和初始法向应力下砂与钢板界面的循环剪切试验研究.研究结果表明，界面剪切应力、法向应力与剪切位移关系曲线分别呈“滞回环”和“阶梯”状发展，且随循环次数的增加趋于“扁平”，相邻循环应力应变曲线趋于重合，两者的循环弱化速率均随初始法向应力和剪切位移幅值的增加而增大；同组试验不同循环下的最大剪切应力随循环次数的增加近似呈对数型弱化；循环剪切过程中界面摩擦角的发展趋势与剪切位移幅值密切相关；循环剪切形成毗邻界面1 cm厚剪切带，剪切带内砂土颗粒破碎率达5%以上.
Abstract:

The self-developed large-scale constant normal stiffness (CNS) interface shear apparatus was used to conduct a series of the cyclic shear tests occurred at the sand-steel plate interface, in order to investigate the degenerate mechanism that occurred at the pile-soil interface under cyclic loading. In the mean time, these tests experienced different shear displacement amplitudes and initial normal stresses. Results show that the relationship of interface shear stress-shear displacement behavior presents a ‘hysteretic’ loop, while the curve of normal stress-shear displacement develops as ‘stair-step’ shape. The curve becomes ‘flat’ and the adjacent curves tend to be overlapped as the number of loops increases. At the same time, the rate of cyclic degeneration raises with the increase of initial normal stress and the amplitude of shear displacement. When the same experiment is under different cycles, the maximum shear stresses degenerate approximately logarithmically with cyclic number. In the process of cyclic shear tests, the development of the interface friction angle is closely related to the shear displacement amplitude. The cyclic shear band thickness adjacent to the interface is 1 cm after cyclic shear tests, moreover, the percentage of sand particle breakage in the shear band is more than 5%.
收稿日期: 2017-03-14 出版日期: 2018-06-20
CLC:  TU437  
基金资助:

国家自然科学基金资助项目（41502304；41772318）；中国博士后科学基金资助项目（2015M581940）；山东省重点研发计划资助项目（2017GSF20107）；青岛市应用基础研究资助项目（16-5-1-34-jch）；住房和城乡建设部科学技术计划资助项目（2014-K3-026）；泰山学者工程专项经费资助项目（鲁政办字〔2015〕212号）.
作者简介: 刘俊伟(1983-),男,副教授,博士,从事岩石工程研究.Orcid.org/0000-0002-1990-8188.E-mail:zjuljw@126.com
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引用本文:

刘俊伟, 朱娜, 王立忠, 尚文昌. 循环荷载下砂与钢板界面的弱化机制[J]. 浙江大学学报(工学版), 2018, 52(6): 1123-1130.

LIU Jun-wei, ZHU Na, WANG Li-zhong, SHANG Wen-chang. Degenerate mechanism of sand-steel interface under cyclic loading. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2018, 52(6): 1123-1130.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2018.06.011    或    http://www.zjujournals.com/eng/CN/Y2018/V52/I6/1123

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