| 冻融循环下初始含水率对非饱和膨胀土剪切特性试验 |
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| 引用本文： | 张琦,杨忠年,时伟,凌贤长,涂志斌.冻融循环下初始含水率对非饱和膨胀土剪切特性试验[J].吉林大学学报(地球科学版),2021,51(5):1544-1550. |
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| 作者姓名： | 张琦 杨忠年 时伟 凌贤长 涂志斌 |
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| 作者单位： | 1. 青岛理工大学土木工程学院, 山东 青岛 266033;2. 哈尔滨工业大学土木工程学院, 哈尔滨 150001 |
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| 基金项目： | 国家重大科研仪器开发基金项目（41627801）；冻土工程国家重点实验室开放基金项目（SKLFSE201601）；山东省泰山学者专项基金项目（2015-212） |
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| 摘 要： | 为探究冻融循环条件下初始含水率对膨胀土偏应力-应变关系和剪切特性的影响，本文对不同初始含水率的非饱和膨胀土进行了不固结不排水三轴剪切试验。结果表明：1）非饱和膨胀土的偏应力-应变曲线的形式随含水率增大由应变软化逐渐转变为应变硬化，偏应力峰值随含水率增大而降低；2）非饱和膨胀土的抗剪强度随初始含水率的增加呈线性下降趋势；3）非饱和膨胀土在第1次冻融循环后偏应力及抗剪强度大幅度下降，在3~7次冻融循环后达到稳定。初始含水率是影响非饱和膨胀土力学性质的主要原因。
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| 关 键 词： | 非饱和膨胀土 初始含水率 冻融循环作用 偏应力-应变关系 |
| 收稿时间： | 2020-11-22 |
Experiment on Shear Characteristics of Unsaturated Expansive Soil with Initial Moisture Content Under Freezing-Thawing Cycles |
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| Zhang Qi,Yang Zhongnian,Shi Wei,Ling Xianzhang,Tu Zhibin.Experiment on Shear Characteristics of Unsaturated Expansive Soil with Initial Moisture Content Under Freezing-Thawing Cycles[J].Journal of Jilin Unviersity:Earth Science Edition,2021,51(5):1544-1550. |
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| Authors: | Zhang Qi Yang Zhongnian Shi Wei Ling Xianzhang Tu Zhibin |
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| Institution: | 1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | In freezing-thawing cycles, soil moisture changes dramatically, which leads to the change of bearing capacity of expansive soil. In this study, the unconsolidated and undrained triaxial shear tests were carried out on unsaturated expansive soil with different initial water content,and the strength variation mechanism of expansive soil in freezing-thawing cycles was analyzed on the basis of experiments. The influence of initial water content on the deviatoric stress-strain relationship and shear characteristics of expansive soil under freeze-thaw cycle was discussed. The results showed that:1) The form of deviatoric stress-strain curve of the unsaturated expansive soil changed gradually from strain softening to strain hardening with the increase of water content, while the peak deviatoric stress decreased with the increase of water content; 2) The shear strength of the unsaturated expansive soil decreased linearly with the increase of initial water content; 3) After the first freezing-thawing cycle, the deviator stress and shear strength of the unsaturated expansive soil decreased significantly, and reached stability after 3 to 7 freezing-thawing cycles. This study provides a powerful basis for the engineering design of expansive soil in a seasonal frozen zone. |
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| Keywords: | unsaturated expansive soils initial moisture content freeze-thaw cycles deviatoric stress-strain relationship |
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