| 干湿循环路径下弱膨胀土峰值及残余强度演化研究 |
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| 引用本文： | 谢辉辉,许振浩,刘清秉,胡桂阳.干湿循环路径下弱膨胀土峰值及残余强度演化研究[J].岩土力学,2019,40(Z1):245-252. |
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| 作者姓名： | 谢辉辉 许振浩 刘清秉 胡桂阳 |
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| 作者单位： | 1. 中国地质大学 教育部长江三峡库区地质灾害研究中心，湖北 武汉 430074；
2. 山东大学 岩土与结构工程研究中心，山东 济南 250016 |
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| 基金项目： | 国家自然科学基金项目（No.41572286） |
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| 摘 要： | 膨胀土具有胀缩性、多裂隙性和超固结性，在自然条件下极易受到降雨和蒸发的干湿循环效应，土的抗剪强度会随着时间的延续而衰减，造成边坡失稳。以荆门弱膨胀土为研究对象，对经历不同干湿循环次数的荆门弱膨胀土开展环剪试验，并探讨分析其峰值强度和残余强度的变化规律。试验结果表明，试样的抗剪强度与法向压力的大小有关，无论是峰值强度还是残余强度均随着法向压力的增大而增大，同时法向压力越大，试样达到残余强度时所需要的剪切位移也会越小；随着干湿循环次数的增加，膨胀土的峰值强度明显衰减，残余强度虽略有变化但并不明显，可近似认为稳定；经历3次干湿循环后膨胀土的峰值黏聚力和残余黏聚力指标已经近乎一致，峰值内摩擦角和残余内摩擦角之间始终保持在2o左右的差异，基本不受循环次数的影响。
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| 关 键 词： | 膨胀土 干湿循环 环剪试验 残余强度 黏聚力 |
| 收稿时间： | 2018-08-31 |
Evolution of peak strength and residual strength of weak expansive soil under drying-wetting cycle paths |
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| XIE Hui-hui,XU Zhen-hao,LIU Qing-bing,HU Gui-yang.Evolution of peak strength and residual strength of weak expansive soil under drying-wetting cycle paths[J].Rock and Soil Mechanics,2019,40(Z1):245-252. |
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| Authors: | XIE Hui-hui XU Zhen-hao LIU Qing-bing HU Gui-yang |
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| Institution: | 1. Three Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, China;
2. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, Shandong 250061, China |
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| Abstract: | Expansive soil is featured with expansibility, multi-crack and over consolidation. When exposed to natural conditions, it vulnerable to the drying-wetting cycle effect of rain and evaporation, thus the shear strength of expansive soil will decreases with time, resulting in expansive soil slope instability. A series of ring shear tests is conducted on weak expansive soil sampled from Jinmen, Hubei province under the condition of drying-wetting cycles to investigate the variation of peak strength and residual strength. Results show that the shear strength of the sample is related to the normal stress, both its peak strength and residual strength increase with the increase of normal stress. Meanwhile, the greater the normal stress is, the smaller the shear displacement is when the sample reaches the residual strength. As the drying-wetting cycle increases, the peak strength of the expansive soil obviously attenuates, while the residual strength of expansive soils varies slightly, but it is not obvious, which can be approximately considered stable as stable. The peak cohesion and residual cohesion of expansive soils after three dry-wet cycles are almost the same. The difference between the peak internal friction angle and residual internal friction angle is always 2°, which is largely unaffected by the number of drying-wetting cycles. |
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| Keywords: | expansive soil wetting-drying cycle ring shear test residual strength cohesion |
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