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季冻区粉质黏土冻胀特性分析

, PP. 44-49

Keywords: 道路工程,粉质黏土,多元回归分析,冻胀特性,冻胀率模型

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Abstract:

粉质黏土属冻胀敏感性土,为了研究其冻胀率随含水率、压实度和冻结温度3个因素的变化规律,对取自黑龙江省境内哈大二级公路的粉质黏土进行了闭式冻胀模拟试验。分析结果表明闭式冻胀单因素条件下,粉质黏土冻胀率与3个因素分别呈现一定的相关关系,低冻结温度、高含水率以及高压实度会加剧土体冻胀;含水率对冻胀率的影响最大,压实度次之,冻结温度最小;粉质黏土的起始冻胀含水率ω0=0.89ωp,临界冻胀含水率ωc=0.97ωp。此外,在冻胀试验结果的基础上,还应用SPSS统计软件建立了冻胀率为因变量,含水率、压实度和冻结温度为自变量的多元回归模型,模型可以用于粉质黏土的冻胀率预测。

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