根系作用下的基材土-岩接触面原位剪切试验研究

丁瑜; 夏振尧; 许文年; 杨奇

doi:10.11779/CJGE201611022

根系作用下的基材土-岩接触面原位剪切试验研究 English Version

丁瑜^{1, 2, 3},
夏振尧^{1, 2, 3},
许文年^{1, 2, 3},
杨奇⁴

1. 三峡库区生态环境教育部工程研究中心,湖北宜昌 443002;
2. 三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌 443002;
3. 三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌 443002;
4. 中国电建集团贵阳勘测设计研究院有限公司,贵州贵阳 550081

基金项目: 国家自然科学基金项目（41202250,51409150）; 湖北省教育厅优秀中青年科技创新团队计划项目（T201304）; 三峡库区生态环境教育部工程研究中心开放基金项目（KF2013-04）

详细信息

作者简介:
丁瑜(1980- ),男,副教授,主要从事边坡防护加固、岩石风化等方面的教学和科研工作。E-mail: thirdding@163.com。

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出版历程
- 收稿日期: 2015-08-31
- 发布日期: 2016-11-19

In-situ shear tests on base material soil-rock interface interacted by roots

DING Yu^{1, 2, 3},
XIA Zhen-yao^{1, 2, 3},
XU Wen-nian^{1, 2, 3},
YANG Qi⁴

1. Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, CTGU, Yichang 443002, China;
2. Collaborative Innovation Center for Geo-hazards and Eco-Environment in Three Gorges Area, Hubei Province, Yichang 443002, China;
3. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Three Gorges University, Yichang 443002, China;
4. Guiyang Engineering Corporation Limitied of Powerchina, Guiyang 550081, China

摘要

摘要: 采用自制原位剪切仪,对不同粗糙度、不同多花木蓝根系密度的基材土-岩接触面进行原位剪切试验,研究了基材土-岩接触面的剪切变形特征。研究表明,基材土-岩接触面剪切应力-位移具有典型的软化特性;受根系加筋、锚固作用影响,含根试样的剪切破坏面粗糙、破碎。根系作用对土-岩接触面峰值剪切强度、峰值剪切位移及残余剪切强度影响明显,对比发现,不同粗糙度下,相同根系面积比对提高界面峰值剪切强度的贡献率差异较小;根系面积比较小时,增强界面峰值剪切强度的贡献率低于粗糙度,随着根系面积比增大,根系提高界面强度的作用更为明显,其贡献率显著增加。
- 生态护坡基材 /
- 土-岩接触面 /
- 原位剪切试验 /
- 根系 /
- 剪切软化
Abstract: The shear characteristics of base material soil-rock interface are studied by means of in-situ shear tests by using the homemade shear apparatus under various interfacial roughnesses and root densities of Indigofera amblyantha. The test results reveal that the shear stress-displacement of the base material soil-rock interface is characterized by typical shear softening. Under the reinforced effect of roots on base material soil and its anchorage effect on soil-rock interface in the tests, the rooted samples exhibit rough fractured shear failure plane. The contribution of roots to improving the interfacial peak shear strength, peak shear displacement and residual shear strength is significant. According to the comparison, it is found that the contribution differences are small for the same root area ratio (RAR) to improving the intrfacial peak shear strength under different roughnesses. For a small RAR, the contribution ratio of roots is lower than that of interfacial roughness. As RAR increases, however, the effect of roots on improving the interfacial peak shear strength is more obvious, the contribution ratio of roots thus increases significantly.
- base material for ecological slope protection /
- soil-rock interface /
- in-situ shear test /
- root /
- shear softening

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参考文献(14)

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