不良级配颗分曲线的方程表述

Equation expression of particle size distribution curve with poor gradation

在相关土水特征曲线拟合的基础上,对复杂形态的不良级配颗分曲线进行了方程表述,采用粒子群全局优化算法进行非线性回归,对不同工程中的颗分曲线进行了拟合验证。结果表明:针对高填方土石混合料粒度空间变异性大特点,可在土水特征曲线拟合方程基础上构建7参数双峰拟合方程,结合优化算法,可较好的实现对不良级配的复杂颗分曲线的拟合。双峰模型对不良级配颗分曲线拟合的效果良好,精度较高,具有明显的优越性和广泛的适用性,为复杂级配土石填筑体的物理力学特性定量表述提供了新的思路。

On the basis of the relevant fitting of soil-water characteristic curve,an equation expression is made on the particle size distribution curve with poor gradation and complicated pattern,for which fitting verifications are carried out on the particle size distribution curves from different projects through the nonlinear regression made with the particle swarm optimization algorithm for global optimization.The results show that a 7-parameter bimodal fitting equation can be built up on the basis of the fitting equation of soil-water characteristic curve for the characteristics of the earth-rock mixture with large spatial variability of the particle size for high filling works,and then the fitting of the complicated particle size distribution curves with poor gradation can be realized in combination with the optimization algorithm as well.The effect of the fitting of the particle size distribution curves with poor gradation made by the bimodal model is better with higher accuracy,obvious advantage and wide applicability,thus a new idea is provided for the quantitative expression of the physico-mechanical characteristics of the earth-rock filling body with complicated gradation.