不同颗粒级配对黏–砂混合土特性的影响分析

Influence of Particle Size Distribution on Characteristics of Clay Sand Mixed Soil

以实际工程案例为依托,对现场所取黏–砂混合土试样进行室内常规物理力学性质试验和室内大型固结直剪试验,获得黏砂混合土相关强度参数和变形参数指标。此外,按质量比制备混合土,开展混合土的室内固结试验和快剪试验,探讨颗粒级配对混合土的强度和变形特性的影响。基于分形维数对颗粒级配的定量描述,建立混合土强度参数、变形参数与分形维数的函数关系,同时通过分形维数反映颗粒级配渐变引起混合土力学性质突变的现象。

Based on a practical engineering case, indoor test and large-scale consolidation direct shear test on clay sand mixed soil samples were conducted, including physical and mechanical property indexes such as strength parameters and deformation parameters. Mixed soil was prepared according to the mass ratio, and the indoor consolidation test and quick shear test were also conducted.The influence of particle size on the strength and deformation characteristics of the mixed soil was discussed. Based on the quantitative description of particle gradation by fractal dimension, the functional relationship between strength parameters, deformation parameters and fractal dimension of mixed soil is established. The phenomenon of sudden change of mechanical properties of mixed soil caused by particle gradation is reflected by fractal dimension.