封闭系统条件下银川平原压实砂土的冻融变形
摘要:结合当地工程地质和气候特点，设计L9(34)正交试验方案，应用单向循环冻融试验方法，研究了银川平原地区压实砂土在压实度、饱和度和冻融循环共同作用下的封闭系统冻融变形特性。研究结果表明：饱和度不小于30%的压实砂土，以水的结冰膨胀效应为主导，表现为冻胀，冻融后体积增大。融沉变形占冻胀变形的比例较大，约80%。冻融变形随压实度的增大而减小，随饱和度的增大而增大，与冻融循环次数呈双曲线关系。饱和度和压实度的共同影响明显大于其中任何一个因素的影响，但也不等于两种因素单独作用结果的简单叠加。饱和度和压实度对压实砂土的冻融变形影响都非常显著，均是主控因素。为减轻冻融的危害，压实砂土工程施工时应严格控制压实度，运营中应严防饱和度增大。研究结果对银川平原冬灌区压实砂土工程的冻害评价与防治具有重要的现实意义。
Abstract:Combined with local engineering geology and climate characteristics,L9(34) orthogonal test was designed.The freeze-thaw deformation characteristics of compacted sandy soil in Yinchuan Plain under the combined action of compaction,saturation and freeze-thaw cycle were studied by using closed system freeze-thaw test method.The results show that compacted sandy soil with saturation not less than 30%is characterized by frost heave,and the volume increases after freezing and thawing,which is dominated by expansion effect of water freezing.Thaw settlement deformation accounts for a large proportion of the frost heave deformation,being about 80%.The freeze-thaw deformation decreases with the increase of compactness,and increases with the increase of saturation,showing a hyperbolic relationship with the number of freeze-thaw cycles.The joint effect of saturation and compaction is obviously greater than that of any one of the factors,but it is not equal to the simple superposition of the results of the two factors acting alone.Saturation and compaction have significant effects on freezethaw deformation of compacted sandy soil,which are the main controlling factors.In order to alleviate the hazards of freezing and thawing,the compaction should be strictly controlled in the construction of compacted sand engineering,and theincrease of saturation should be strictly prevented in operation.The research results have practical significance for the evaluation and prevention of the frost damage of compacted sand engineering in Yinchuan plain winter irrigation area.
中文标题：
封闭系统条件下银川平原压实砂土的冻融变形
Freeze-thaw Deformation of Compacted Sandy Soil in Yinchuan Plain under Closed System
作者：
徐韩宝,崔自治,,沈素平
Xu Hanbao,Cui Zizhi,,Shen Supin
作者简介:徐韩宝，男，1993年生，汉族，甘肃武都人，在校本科生。E-mail：1728280114@qq.com通讯作者:崔自治，男，1963年生，汉族，河南永城人，教授。E-mail：CZZ206248@qq.com
通讯地址：
银川能源学院, 宁夏银川 750100
YinchuanUniversityofEnergy,Yinchuan750100,Ningxia,China
中图分类号:TU442
doi:10.3969/j.issn.1007-2993.2019.05.004
出版物：岩土工程技术
收稿日期:2018-06-10
网络出版日期:2021-07-06
关键词:压实砂土,封闭系统,冻融变形,显著性
Key words:compacted sandy soil,closed system,freeze-thaw deformation,saliency
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基金项目：
基金项目: 银川能源学院科研项目(2018-KY-J-03)；宁夏回族自治区大学生创新创业训练项目(NXCX2018370)
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