关键词: 缩尺方法, 粗粒料, 最大干密度, 渗透性

Abstract: Scaling methods in Chinese codes and specifications were used to treat the wide-graded coarse-grained materials with maximum diameter of 200 mm. By controlling maximum particles to 60mm and 20mm respectively, several simulated gradations are obtained. And aiming to the simulated gradation and original gradation, the maximum dry density test and permeability test were conducted to the treated materials to study the effects of different scaling methods and maximum particles on the density and permeability of coarse-grained materials. Experimental results show that, for the maximum dry density test, the maximum dry density decreases with the maximum diameter by using the same scaling method, which demonstrates that coarse particles have a significant skeleton effect. Due to a proper P5 content after treatment, the fine particles achieve a better filling state and a maximum dry density could be obtained, the test value of simulated gradation is closer to that of original gradation. Under this principle, the similar gradation method and mixing method are superior to exclusion method and equivalent replacing method. For the permeability test, the permeability of material with relatively little maximum diameter is smaller by using the same scaling method. The content of fine particles significantly influences the permeability, especially the particles less than 5 mm. Under this principle, the equivalent replacing method is the most suitable.

Key words: scaling method, coarse-grained materials, maximum dry density, permeability