摘要
对某原型级配粗粒料,按规范要求采用剔除法、等量替代法、相似级配法、混合法等4种缩尺方法,获得15条模拟级配,相应的最大颗粒粒径分别为60、40、20 mm。在相同振动功能条件下,对模拟级配进行了最大干密度试验,研究同一原型级配经不同级配缩尺方法后其最大干密度值的变化规律。分析认为,最大干密度与缩尺后级配的不均匀系数、曲率系数、最大颗粒粒径、小于5 mm粒组含量等参量相关,提出了修正级配参数方法,即将最大干密度与级配相关参量归一化。最后进行了试样尺寸直径为1 m的原型级配粗粒料的击实试验,验证了归一化公式的合理性。
There are about 4 methods, i.e. scalping method, equivalent substitution method, similar gradation method and hybrid method, to model the site gradation of soil materials according to the code. And 15 modeling gradations of coarse-grained materials from an engineering site have been modeled by using these gradation scale methods; by the same token, their equivalent particle diameters are 60, 40, 20 mm. The maximum dry density tests also have been conducted to these modeling gradations in the same vibration energy; and the distributing law of maximum dry density value can be concluded. In conclusion, the maximum dry density value goes together with the nonuniform coefficient, curvature coefficient, maximum particle diameter and lower groups(≤5 mm), etc. And a corrected gradation parameter has been put forward to normalize the relationship between maximum dry density and relative parameters of gradation. To justify the rationality of normalized formula, the site coarse-grained materials compaction tests have been conducted with the sample diameter of 1 m.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2015年第S1期417-422,共6页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51379021
No.51309024)
中央级公益性科研院所基本科研业务费(No.CKSF2014055/YT
No.CKSF2015051/YT)
关键词
缩尺效应
级配缩尺方法
粗粒料
最大干密度
级配参数
scale effect
gradation scale method
coarse-grained soil
maximum dry density
gradation parameter
