密实度不同时格栅-砂土界面循环剪切及其后直剪特性

王军; 王攀; 刘飞禹; 胡秀青; 蔡袁强

doi:10.11779/CJGE201602019

密实度不同时格栅-砂土界面循环剪切及其后直剪特性 English Version

王军^{1, 3},
王攀²,
刘飞禹^2,,
胡秀青^{1, 3},
蔡袁强^{1, 3}

1. 温州大学建筑与土木工程学院,浙江温州 325035; 2. 上海大学土木工程系,上海 200072; 3. 浙江省软弱土地基与海涂围垦工程技术重点实验室,浙江温州 325035）科技创新团队项目（2011R50020）;温州市重点科技创新团队项目

基金项目: 国家自然科学基金项目（51478255,51278383,51238009,; 51478364）; 上海市自然科学基金项目（14ZR1416100）; 浙江省重点

详细信息

作者简介:
王军(1980- ),男,教授,主要从事地基处理与土动力学方面的研究工作。E-mail: sunnystar1980@163.com。

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出版历程
- 收稿日期: 2015-03-02
- 发布日期: 2016-02-24

Cyclic and post-cyclic direct shear behaviors of geogrid-sand interface with different soil densities

WANG Jun^{1, 3},
WANG Pan²,
LIU Fei-yu^2,,
HU Xiu-qing^{1, 3},
CAI Yuan-qiang^{1, 3}

1. Architecture and Civil Engineering College, Wenzhou University, Wenzhou 325035, China; 2. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 3. The Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province, Wenzhou 325035, China)（C20120006

摘要

摘要: 为研究密实度不同时格栅-砂土界面在经历循环剪切及其后的表现,采用大型直剪仪进行了一系列大型单调直剪试验、循环直剪试验和循环后单调直剪试验。并将单调直剪试验与循环后单调直剪试验的结果进行对比分析。结果表明：单调直剪试验中,随着砂土密实度的增加筋土界面抗剪强度增加,剪切体胀现象变的明显;格栅-密砂界面发生循环剪切软化现象,土样在循环剪切过程当中整体上发生剪缩,且砂土密实度越大经历相同循环次数时的剪缩量越小;循环后单调直剪试验中,3种砂土密实度界面抗剪强度发展曲线都为软化型,在直剪过程中都发生自始至终的剪胀;遭受循环剪切后密砂-格栅界面抗剪强度发生了退化。
- 筋土界面 /
- 密实度 /
- 循环剪切 /
- 应力历史
Abstract: In order to investigate the cyclic and post-cyclic shear behaviors of geogrid-sand interface with different soil densities, a series of large-scale monotonic direct shear tests, cyclic direct shear tests and post-cyclic monotonic direct shear tests are performed using a large-scale direct shear device. Comparison and analysis are made between the results from monotonic direct shear tests and post-cyclic monotonic direct shear tests. The results show that the interface shear strength increases with soil density, and more evident dilatancy is observed with higher soil density in the monotonic direct shear tests. The degradation of cyclic shear stress is observed in the geogrid-dense sand interface, the soil tends to be contracted when suffering from cyclic shear, and the volume contraction increases with soil density. The interface shear strength tends to be strain softening, and the soil exhibits dilatancy throughout the tests in the post-direct shear tests with different soil densities. The degradation of the post-cyclic shear is observed in the dense sand-geogrid interface.
- soil-geogrid interface /
- density /
- cyclic shear /
- stress history

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