| 分级循环荷载下低温冻结盐渍土动强度特性试验研究 |
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| 引用本文： | 赵福堂,常立君,张吾渝.分级循环荷载下低温冻结盐渍土动强度特性试验研究[J].冰川冻土,2019,41(6):1397-1405. |
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| 作者姓名： | 赵福堂 常立君 张吾渝 |
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| 作者单位： | 青海大学 土木工程学院, 青海 西宁 810016 |
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| 基金项目： | 青海省科技厅项目（No.2017-ZJ-791）；国家自然科学基金项目（51768060）资助 |
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| 摘 要： | 为了探究寒区路基盐渍土在交通荷载作用下的强度破坏机理，采用室内GDS动三轴试验系统，对天然重塑盐渍土进行了不同冻结温度、围压及振动频率下一系列动荷载试验，从破坏动应力、动黏聚力和动内摩擦角方面分析各试验条件对盐渍土的影响机制。结果表明：冻结温度和围压对破坏动强度影响明显，动载频率对破坏动强度影响较弱；随着温度的降低，破坏动应力和动黏聚力明显增大，而动内摩擦角有先增大后减小趋势；随着动荷载频率的增大，破坏动应力和动黏聚力变化不明显，但内摩擦角有减小趋势；围压与破坏应力呈线性相关，温度分别与破坏动应力、动黏聚力呈良好指数关系。
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| 关 键 词： | 冻结盐渍土 路基 动三轴试验 振动频率 动强度 |
| 收稿时间： | 2019-06-11 |
| 修稿时间： | 2019-09-06 |
Experimental study on dynamic strength characteristics of frozen saline soil under stepped cyclic loading |
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| ZHAO Futang,CHANG Lijun,ZHANG Wuyu.Experimental study on dynamic strength characteristics of frozen saline soil under stepped cyclic loading[J].Journal of Glaciology and Geocryology,2019,41(6):1397-1405. |
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| Authors: | ZHAO Futang CHANG Lijun ZHANG Wuyu |
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| Institution: | School of Civil Engineering, Qinghai University, Xining 810016, China |
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| Abstract: | In order to explore the failure mechanisms of saline soil in cold areas under traffic load. Using the indoor GDS dynamic triaxial test system, a series of dynamic load tests were carried out on natural remolded saline soil under different freezing temperature, confining pressure and vibration frequency. The influence mechanisms of each test condition on the dynamic stress, dynamic cohesion and dynamic internal friction angle were analyzed. The results show that with temperature decrease, the destructive dynamic stress and dynamic cohesion increase significantly, while internal friction angle increases first and then decreases; with the increase of the dynamic load frequency, dynamic stress and dynamic cohesion force change are not obvious, and the internal friction angle shows a decreasing trend; the confining pressure is linearly correlated with the failure stress, and the temperature has a good exponential relationship with the failure dynamic stress and the dynamic cohesion. |
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| Keywords: | frozen saline soil subgrade dynamic triaxial test vibration frequency dynamic strength |
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