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土的级配特征与连续级配方程研究

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级配显著影响着土的工程力学特性,深入研究土的级配特征并建立级配方程将其定量表达,对于土的物理力学性质分析与工程应用至关重要.通过分析不同粒组含量分布态势下土的级配特征,确定了连续级配土级配曲线的基本形态.基于Burr分布,提出了一个适用于各类连续级配土的连续级配方程,对级配方程特征参数和级配曲线形态的关系进行定量分析,并利用实际工程数据验证了该连续级配方程的广泛适用性.研究表明:土的粒组含量分布态势和级配曲线形态有很好的对应关系,连续级配曲线存在近似直线形、双曲线形、上凸形和反S形等4种基本形态;提出的连续级配方程可以很好地描述连续级配曲线的4种基本形态;通过连续级配方程特征参数分析,可以定量判断土的级配曲线形态和级配优劣情况;连续级配方程对天然砂砾料和人工爆破堆石料等粗粒土,以及覆盖层天然砂土、粉土和黏土等细粒土,均能够很好地描述它们的级配特征.
Study on soil gradation characteristics and continuous grading equation
The Grading of soil has a significant impact on its engineering mechanical properties.The comprehensive investigation of soil grading characteristics and the establishment of quantitative grading equations are essential for analyzing the physical and mechanical properties of soil as well as its engineering applications.By ana-lyzing the gradation characteristics of soil under various particle content distribution patterns,the fundamental form of the gradation curve of continuously graded soil was determined.Based on the Burr distribution,a continuous grading equation suitable for various types of continuously graded soil was proposed.The relationship between the characteristic parameters of the grading equation and the shape of the grading curve was quantitatively analyzed,and the wide applicability of the continuous grading equation was verified using actual engineering data.The re-search findings indicate a strong correlation between the distribution pattems of soil particle composition content and the shape of gradation curve,and there are four basic shapes for continuous gradation curve,including approxi-mately straight,bisquar,convex and inverse S-shape.The proposed continuous grading equation can accurately describe these four basic forms.The shape of the grading curve and the quality soil grading can be quantitatively de-termined by analyzing the characteristic parameters of the continuous grading equation.The continuous grading e-quation can well describe the grading characteristics of coarse-grained soil,such as natural gravel and artificial blasting rockfill,as well as fine-grained soil like natural sand,silt,and clay in the covering layer.

continuous graded soilgrading curvecontinuous grading equationapplicability verification

樊书抗、杨正权、朱凯斌、赵艺颖、刘小生、赵剑明

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中国水利水电科学研究院流域水循环模拟与调控国家重点实验室,北京 100038

连续级配土 级配曲线 连续级配方程 适用性验证

国家重点研发计划国家自然科学基金中国水科院基本科研业务费专项中国水科院科技成果转化基金流域水循环模拟与调控国家重点实验室自主研究项目

2017YFC040490251509272GE0145B052021GE121003A0032022SKL2022ZD05

2024

10.13243/j.cnki.slxb.20230810

水利学报
中国水利学会

水利学报

CSTPCD北大核心
影响因子：1.778
ISSN：0559-9350
年,卷(期)：2024.55(5)
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