循环前后不同颗粒粒径下sandwich形加筋土筋土界面单调直剪特性

doi:10.12066/j.issn.1007-2861.1826

上海大学学报(自然科学版) ›› 2018, Vol. 24 ›› Issue (3): 456-466.doi: 10.12066/j.issn.1007-2861.1826

循环前后不同颗粒粒径下sandwich形加筋土筋土界面单调直剪特性

刘飞禹¹, 张端阳¹, 王军²()

1.上海大学土木工程系, 上海 200444
2.温州大学建筑与土木工程学院, 浙江温州 325035

收稿日期:2016-06-21 出版日期:2018-06-15 发布日期:2018-06-28
通讯作者: 王军 E-mail:sunnystar1980@163.com
基金资助:
国家自然科学基金资助项目(51478255);国家自然科学基金资助项目(51278383);上海市自然科学基金资助项目(14ZR1416100);科技部国际合作专项基金资助项目(2015DFA71550);温州市重点科技创新团队项目(C20120006)

Cyclic and post-cyclic direct shear behavior of sandwich reinforcement-soil interface under different sand particle sizes

LIU Feiyu¹, ZHANG Duanyang¹, WANG Jun²()

1. Department of Civil Engineering, Shanghai University, Shanghai 200444, China
2. Architecture and Civil Engineering College, Wenzhou University, Wenzhou 325035, Zhejiang, China

Received:2016-06-21 Online:2018-06-15 Published:2018-06-28
Contact: WANG Jun E-mail:sunnystar1980@163.com

摘要/Abstract

摘要：

采用3种不同颗粒粒径石英砂作为sandwich加筋土中薄砂层, 使用大型直剪仪分别对不同薄砂层厚度的sandwich形加筋土进行了单调直剪、循环剪切及循环后直剪试验. 试验结果表明:在单调直剪和循环后直剪过程中, 不同颗粒粒径下都存在一个最优厚度,使筋土界面内剪应力最大, 且颗粒粒径越大, 最优薄砂层厚度越大;在循环剪切过程中, 随着颗粒粒径增大, 界面强度呈先增大后减小的趋势;相比单调直剪结果而言, 在循环后的直剪过程中筋土界面的峰值剪应力更大,体积变更小.

关键词: 直剪试验, 筋土界面, 应力历史, 颗粒粒径

Abstract:

With three different particle sizes of quartz sand as a part of fill material, direct shear tests, cyclic shear tests and post-cyclic direct shear tests were performed using a large-scale direct shear device under different thicknesses of sand. The results indicate that, in the direct shear and post-cyclic direct tests, peak shear stress of the interface reach a maximum value with the optimal thickness of thin sand layer under different particle sizes. The optimal thickness of thin sand layer interface increases with the increase of particle. In the cyclic shear tests, the maximum shear stress of interface also show a trend from increase to decrease with the increase of sand particle size. The peak shear stress of interface increases and the volume change decreases in the post-cyclic direct shear tests as compared to the direct shear tests.

Key words: direct shear test, reinforced soil interface, stress history, particle size

中图分类号:

TU443

刘飞禹, 张端阳, 王军. 循环前后不同颗粒粒径下sandwich形加筋土筋土界面单调直剪特性[J]. 上海大学学报(自然科学版), 2018, 24(3): 456-466.

LIU Feiyu, ZHANG Duanyang, WANG Jun. Cyclic and post-cyclic direct shear behavior of sandwich reinforcement-soil interface under different sand particle sizes[J]. Journal of Shanghai University（Natural Science Edition）, 2018, 24(3): 456-466.

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循环前后不同颗粒粒径下sandwich形加筋土筋土界面单调直剪特性

Cyclic and post-cyclic direct shear behavior of sandwich reinforcement-soil interface under different sand particle sizes

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