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为合理选用级配方程,总结了现有的三类适用于连续级配土的级配方程,即双曲线型、反S型及混合型的级配曲线,并分析了各类方程的特点及应用。结果表明,双曲线型和反S型的方程均只能描述单一形态的级配曲线,该类曲线的形态特点是在双对数坐标系下为标准的直线;混合型的方程对于双曲型形和反S型的级配曲线均能很好地描述,且拟合现有的级配曲线时具有良好的适用性;级配方程可方便地在室内试验时配制级配良好的土料,且能够用于土体的级配设计,相比于传统的方法,能够简化计算。
In order to select gradation equation reasonably, the existing gradation equations for hyperbolic, anti-S and mixed type are summarized, and the characteristics of various equations and their relations are also analyzed. application. The results show that the hyperbolic and inverse S-type equations can only describe the gradation curve of a single shape. The morphological characteristics of this type of curve are the standard straight lines in the double logarithmic coordinate system. For the hyperbolic Form and anti-S-type grading curve can be well described, and fit the existing gradation curve has good applicability; grading equation can be easily formulated in the laboratory test graded good soil, And can be used for soil grading design, compared to the traditional method, can simplify the calculation.