| 冻结作用下粉土-混凝土接触面抗拉强度试验研究 |
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| 引用本文： | 高晓静,孙铁成,李晓康,廖一鸣.冻结作用下粉土-混凝土接触面抗拉强度试验研究[J].冰川冻土,2020,42(2):499-507. |
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| 作者姓名： | 高晓静 孙铁成 李晓康 廖一鸣 |
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| 作者单位： | 1.石家庄铁道大学 省部共建交通工程结构力学行为与系统安全国家重点实验室, 河北 石家庄 050043;2.石家庄铁道大学 土木工程学院, 河北 石家庄 050043 |
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| 基金项目： | 河北省自然科学基金项目(E2015210006) |
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| 摘 要： | 为探究冻结作用下土与结构接触面抗拉强度的影响因素及变化规律， 开展了冻结状态下多种含水率、 温度及干密度的粉土-混凝土接触面抗拉强度正交试验研究。试验结果表明： 在试验温度下，粉土-混凝土接触面的冻结抗拉强度约为饱和黄土的1/10， 粉质黏土的1/10 ~ 1/7； 含水率对接触面的冻结抗拉强度影响最大， 其次是温度、 干密度； 在试验含水率范围内， 接触面的冻结抗拉强度与含水率正相关； 温度降低会增大接触面冻结抗拉强度， 在-2 ℃至-6 ℃， 冻结抗拉强度迅速增长， 在-6 ℃以后， 冻结抗拉强度的增长速率显著减小。结果证明： 低温、 高含水率、 低干密度条件下， 接触面冻结抗拉强度达到最佳； 三种因素对接触面冻结抗拉强度具有不同的影响程度， 其中含水率、 温度影响显著， 干密度影响不显著； 在试验含水率区间内， 接触面冻结抗拉强度随含水率增长呈线性增长态势， 且含水率、 温度之间存在交互作用； 随温度降低， 存在一临界负温， 接触面冻结抗拉强度由迅速增长转为缓慢增长。
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| 关 键 词： | 冻结作用 粉土-混凝土接触面 抗拉强度 正交试验 |
| 收稿时间： | 2019-09-25 |
| 修稿时间： | 2020-01-06 |
Experimental study on tensile strength of silt-concrete interface under frost action |
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| Xiaojing GAO,Tiecheng SUN,Xiaokang LI,Yiming LIAO.Experimental study on tensile strength of silt-concrete interface under frost action[J].Journal of Glaciology and Geocryology,2020,42(2):499-507. |
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| Authors: | Xiaojing GAO Tiecheng SUN Xiaokang LI Yiming LIAO |
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| Institution: | 1.State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures，Shijiazhuang Tiedao University，Shijiazhuang 050043，China;2.School of Civil Engineering，Shijiazhuang Tiedao University，Shijiazhuang 050043，China |
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| Abstract: | In order to explore the influencing factors and changing laws of the frozen tensile strength of soil-structure interface under freezing action， orthogonal test study on frozen tensile strength of silt-concrete interface under various moisture， temperature and dry density conditions was carried out by a self-developed test device. The test results show that under frost action， the tensile strength of silt-concrete interface is about 1/10 of the saturated loess， and 1/10 - 1/7 of the silty clay； the moisture has the greatest influence on the frozen interface tensile strength， followed by temperature and dry density. In the test moisture range， the interface tensile strength is positively correlated with the moisture. When temperature decreases， the interface frozen tensile strength increases rapidly between -2 ℃ and -6 ℃， and the growth rate decreases significantly after -6 ℃. The results show that the interface frozen tensile strength is optimal under low temperature， high moisture and low dry density； the test factors have different influence degree on the frozen tensile strength， and the water content and temperature have significant influence while the effect of dry density is not significant； in the test moisture range， the interface frozen tensile strength is positively correlated with the increase of moisture， and there is interaction between moisture and temperature； with the decrease of temperature， there is a critical negative temperature where interface frozen tensile strength changed from rapid growth to slow growth. The "critical negative temperature" phenomenon in the process that frozen interface tensile strength changes with temperature was discussed from the perspectives of unfrozen water content and moisture migration. |
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| Keywords: | frost action tensile strength silt-concrete interface orthogonal test |
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