中文摘要：

利用大型三轴仪选用一种典型堆石料,通过设置4种级配、4种相对密度开展一系列不同围压作用下的大型三轴压缩试验,以研究级配、密度、应力状态等因素对堆石料强度与变形特性的影响。基于以上试验,对比分析不同级配、不同密度、不同围压条件下堆石料的应力变形特性,结果表明：试样颗粒越粗,剪切过程中试样越呈现应变硬化和压缩变形特性,随着颗粒逐渐变细,应变软化和剪胀特性愈加明显;堆石料强度与变形特性不仅与其密实和所处的应力状态有关,而且初始级配对其强度与变形特性有显著影响;堆石料强度包络线符合幂函数关系,并通过分析计算验证了其合理性与正确性。分析结果为进一步研究堆石料的状态相关剪胀理论及状态相关本构模型奠定了基础。

英文摘要：

In order to study the influences of gradation, density and stress state on the strength and deformationbehaviors of the rockfill materials, some typical materials are selected for large triaxial shearing tests, so a series oflaboratory tests are designed under the conditions of different gradations, densities and confining pressures by thelarge triaxial equipment. According to the experimental results, and by analyzing and comparing the stress-straincharacteristics, we can get many important conclusions ： firstly, the larger the grain size of samples, the moreobvious the strain hardening and compression behaviors among the shearing process, and on the contrary, thesmaller the grain size of samples, the more obvious the strain softening and dilatancy properties ; secondly, thestrength and deformation of the rockfill materials are related to the density and stress state, and the influence of thesample initial gradation is so large that it should be paid more attention to ; the last but not the least, the intensityenvelope of the rockfill materials changes by a power function relationship, and the rationality and validity isverified by analyzing test results and calculation results. The research results of this paper are the basis of furtherstudies of the state-dependent dilatancy theory and state-dependent constitutive model of the rockfill materials.