| 摘要: |
| 以整治青藏铁路环青海湖段季节性冻土区路基冻害为背景，通过现场采集典型分布的粉质黏土，考虑温度、含水率、含盐量（质量分数）、压实度四个因素，进行室内冻胀正交试验，测试了不同温度环境下路基土体的冻胀率，进行正交试验的极差分析和方差分析，建立灰色关联度分析模型，分析各因素对冻胀影响的主次关系。结果表明，正交试验分析和灰色关联度分析所得规律一致，影响冻胀因素由主到次依次为温度、含盐量、含水率和压实度，因素之间的交互作用影响较小可以忽略；温度和含盐量对冻胀影响非常显著，含水率对冻胀有显著影响，压实度和其他3个因素之间的交互作用对冻胀没有显著影响。 |
| 关键词: 铁路路基 路基冻害 冻胀 正交试验 灰色关联度 |
| DOI：10.12170/201901004 |
| 分类号:TU43 |
| 基金项目:青藏铁路公司科技研究开发计划课题（QZ2015 G01）； 冻土工程国家重点实验室开放基金项目（SKLFSE201607） |
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| Comprehensive analysis on frost heave factors of subgrade soil in seasonally frozen ground region |
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GONG Lili1, LIU Deren1, YANG Nan2, WANG Yuewu2, ZHANG Yanjie1
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1.School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou;2.Xining Railway Section of Qinghai Tibet Railway Company， Xining
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| Abstract: |
| Aiming at the roadbed frost damage of the seasonal frozen soil area around the Qinghai Lake section of Qinghai Tibet Railway, the typical distributed silty clay is collected focusing attention on the four factors: temperature, moisture, salinity, and compaction so as to conduct the indoor frost heave orthogonal test. The frost heave rates of subgrade soil under different temperatures have been tested, and the gray correlation degree analysis model is established to carry out the range analysis and variance analysis of orthogonal experiment. Then the influence of various factors on the frost heave is analyzed. The results show that the orthogonal test analysis and gray correlation analysis have the same law, and that the factors affecting the frost heaving are mainly temperature, salt content, water content, and compaction. The interaction between the factors is negligibly tiny, but the effect of temperature, salinity and water content on the frost heave is very significant. On the contrary, the interaction between compaction and factors has no significant effect on frost heave. |
| Key words: railway subgrade roadbed frost damage frost heave orthogonal test gray correlation degree |
