| 引用本文: | 岑国平,龙小勇,洪刚,刘垍荧,王新忠,贾勇.青藏高原季冻区砂砾土冻胀特性试验Symbol`@@[J].哈尔滨工业大学学报,2016,48(3):53.DOI:10.11918/j.issn.0367-6234.2016.03.009 |
| CEN Guoping,LONG Xiaoyong,HONG Gang,LIU Jiying,WANG Xinzhong,JIA Yong.Frost heaving properties of gravel soil in seasonal frozen region of Qinghai-Tibet Plateau[J].Journal of Harbin Institute of Technology,2016,48(3):53.DOI:10.11918/j.issn.0367-6234.2016.03.009 |
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| 摘要: |
| 为探索青藏高原季冻区砂砾土的冻胀特性，为机场工程防冻胀设计提供依据，首先进行颗粒分析实验、击实实验等砂砾土的基本特性实验，为冻胀率室内实验提供相应依据，然后在传统冻胀率室内实验装置的基础上针对砂砾土粒径大的特点进行改进，利用改进后装置进行一系列正交试验，研究含水率、含泥量、压实度、上覆荷载、补水对冻胀率的影响规律.试验结果表明：在封闭条件下，冻胀率随含水率的增大而线性增大；随含泥量的增大呈非线性关系递增；随压实度的增大呈先增大后减小的趋势，在压实度为95%的状态下达到最大值；随上覆荷载的增大呈线性关系平缓递减.在外界补水条件下，冻胀率增大3倍以上.经多元回归分析，得到了多因素综合影响下的回归预报公式.各个因素对冻胀率的影响从大到小依次为：补水，含水率，含泥量，压实度，上覆荷载.在工程实际中，控制补水、含水率、含泥量是防冻胀设计的关键.
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| 关键词: 机场土基 砂砾土 冻胀 含水率 含泥量 多元回归分析 |
| DOI：10.11918/j.issn.0367-6234.2016.03.009 |
| 分类号:TU411.99 |
| 文献标识码:A |
| 基金项目:民航科研专项资金(MHRD20140216). |
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| Frost heaving properties of gravel soil in seasonal frozen region of Qinghai-Tibet Plateau |
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CEN Guoping1, LONG Xiaoyong1, HONG Gang1, LIU Jiying1, WANG Xinzhong2, JIA Yong2
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(1.School of Aeronautics and Astronautics Engineering, Air Force Engineering University, 710075 Xi’an, China; 2.China Civil Airport Construction Corporation, 710075 Xi’an, China)
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| Abstract: |
| In order to explore frost heaving properties of gravel soil containing mud in seasonal frozen region of Qinghai-Tibet Plateau, and provide the foundation for airport engineering anti-freezing expansion design, Particle analysis experiment and compaction experiment were conducted to provide the basis indoor frost heaving rate experiment. Then it improved for gravel soil particle size characteristics of large heaving rate based on traditional means of laboratory experiments, following the improved apparatus a series of sets of orthogonal frost heave indoor tests were conducted to study the influence of factors including degree of compaction, moisture content, silt content, overlying load, water replenishing on frost heaving ratio by the improved experiment device. The test results show that frost heaving ratio of gravel soil containing mud in seasonal frozen region of Qinghai-Tibet Plateau showed a trend of decrease after the first increase with the increase of degree of compaction in a sealed environment, and approaches its maximum at the compaction degree of 95%; increases linearly with the increase of moisture content, increases with the increase of silt content corresponding to a polynomial function; Gently decreases at an exponential functional with the increase of overlying load. Frost heaving ratio increases over three times under the condition of the water replenishing. Multi-factor regression forecast formula is obtained by the multiple regression analysis. The influence of various factors on frost heaving ratio decreasing order:water replenishing, moisture content, silt content, degree of compaction, overlying load. Consequently, it is the key of anti-freezing expansion design to control water replenishing, moisture content, silt content.
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| Key words: airport earth subgrade gravel soil frost heaving moisture content silt content multiple regression analysis |
