对某级配粗粒料采用混合法、剔除法、等量替代法和相似级配法等4种不同缩尺方法进行缩尺。缩尺后替代级配料的最大粒径分别为10、20、40和60 mm。对各替代级配料进行了相对密度试验。同时，为完善试验成果，又人工随意配置了3种级配料用于试验。最大、最小干密度试验分别采用振动台法和松填法。研究同一原型级配料不同方法缩尺后各级配土石料在同一压实功能情况下的最大、最小干密度与土料级配参数、最大粒径之间的关系。提出了一种将干密度与级配之间关系归一化的方法，并拟合了干密度与Cu、Cc及最大粒径之间的关系，据此可推求原型级配料的最大干密度。

Four different scaling methods are used to scale a coarse-grained soil into a grading with smaller particles. The methods are mixing method, scalping method, equal-weight replacement method and similar grading method. The biggest grain size of each soil after grading is 10mm, 20mm, 40mm and 60mm, respectively. A number of relative density tests are conducted. To further analyse the test results, more relative density for other three soils with arbitrary grading are performed. The maximum and minimum dry density tests are carried out using vibrating method and loose filling method. The relationship between maximum or minimum dry density and the soil grading parameters, maximum particle size is investigated under the same compactive effort. A normalizing method is presented to express the relationship between dry density and grading. The relationship of dry density versus Cu, Cc and maximum particle size is found. According to the relation, the maximum dry density of the real gradation can be determined.

国家自然科学基金委员会、二滩水电开发有限责任公司雅砻江水电开发联合基金项目（No. 50639050）；国家杰出青年科学基金资助（No. 50825901）；水利部公益性行业科研专项（200801133）“高心墙堆石坝安全性评价技术研究”。