| 不同环剪方式下滑带土残余强度试验研究 |
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| 引用本文： | 王顺,项伟,崔德山,杨金,黄旋.不同环剪方式下滑带土残余强度试验研究[J].岩土力学,2012,33(10):2967-2972. |
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| 作者姓名： | 王顺 项伟 崔德山 杨金 黄旋 |
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| 作者单位： | 1. 中国地质大学 工程学院，武汉 430074；2. 中国地质大学 教育部长江三峡库区地质灾害研究中心，武汉 430074 |
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| 基金项目： | 国家自然科学基金(No.41272308);国家自然科学基金(No.41002102) |
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| 摘 要： | 以三峡库区黄土坡滑坡滑带土为研究对象，利用环剪仪研究了黄土坡滑坡滑带土在单级剪、预剪以及多级剪3种环剪方式下的残余强度特征。试验结果表明：不同环剪试验下剪切带的形成与剪切位移相关；残余强度随有效法向应力的增大而增大，对于已经存在剪切带的滑带土，环剪时能很快达到残余强度状态；滑带土环剪轴向压缩分初始剪胀、颗粒运移压密和稳定压密3个阶段，且每个阶段剪应力变化趋势不同；预剪试验和多级剪切试验得到的残余强度偏大，应该首选单级剪切试验测试滑带土残余强度指标。
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| 关 键 词： | 环剪试验 残余强度 滑带土 黄土坡滑坡 |
| 收稿时间： | 2011-09-15 |
Study of residual strength of slide zone soil under different ring-shear tests |
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| WANG Shun
,
XIANG Wei
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CUI De-shan
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YANG Jin
,
HUANG Xuan.Study of residual strength of slide zone soil under different ring-shear tests[J].Rock and Soil Mechanics,2012,33(10):2967-2972. |
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| Authors: | WANG Shun XIANG Wei CUI De-shan YANG Jin HUANG Xuan |
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| Institution: | 1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China; 2. Three Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Slide zone soil of Huangtupo landslide is studied in detail as a typical example in the Three Gorges Reservoir.Three types of shear methods,including single-stage shearing,pre-shearing and multi-stage shearing,are conducted to investigate the residual strength of slide zone soil by employing ring-shear apparatus.It is conducted that the formation of shear band of slide zone soil is relevant with the shear displacement;the residual strength increases with the increasing of effective normal stress.For slip soil sample with a pre-existing shear band,residual shear strength can be soon and easily reached;initial dilatancy phase,contraction phase due to grain migration and constant contraction phase make up shear settlement curves of different ring-shear tests and the changing trend of shear stress in each stage is different.The residual strengths obtained from pre-shearing test and multi-stage test are larger than the actual value;the single stage shearing should be the preferred approach to acquire residual strength of slide zone soil. |
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| Keywords: | ring-shear test residual strength slide zone soil Huangtupo landslide |
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