【摘要】 为了明确级配碎石的力学性能,采用密度试验、空隙率试验、加州承载比(CBR)试验、动三轴试验研究级配类型和成型方式对级配碎石力学性能的影响规律,并建立了力学性能的多参数预估模型。结果表明:1击实成型的最大干密度为振动成型的1.03~1.07倍。2连续型级配碎石的CBR值在振动成型下为击实成型的1.51倍,回弹模量为1.08倍;回弹模量与CBR值呈幂函数,与最大干密度和空隙率的乘积成正比。3间断型级配碎石的CBR值在击实成型下为振动成型的1.49倍,回弹模量为1.05倍;回弹模量与CBR值呈幂函数,与最大干密度和空隙率的乘积成反比。4骨架结构是决定级配碎石力学性能的第一因素。研究结果为级配碎石力学性能的预测提供理论依据,为配合比设计和确定施工工艺提供试验支撑。更多还原

【Abstract】 In order to determine the mechanical properties of graded macadam,the influence of gradation type and molding method on the mechanical properties was analyzed using density test,void ratio test,California bearing ratio(CBR) test and dynamic triaxial test,and a multi-parameter prediction model was established. The results show that the maximum dry density under compaction molding is 1. 03 to 1. 07 times of that under vibration molding. For continuous graded macadam,CBR under vibration molding is 1. 51 times of that under compaction molding,resilient modulus is1. 08 times,and resilient modulus is a power function of CBR and is proportional to the product of maximum dry density and void ratio. For discontinuous graded macadam,CBR under compaction molding is 1. 49 times of that under vibration molding,resilient modulus is 1. 05 times,and resilient modulus is a power function of CBR and is inversely proportional to the product of maximum dry density and void ratio. Framework structure is the first factor to determine the mechanical properties of graded macadam. The results will provide theoretical basis for the prediction of mechanical propertiesof graded macadam,provide test support for gradation design,and determine construction technology.更多还原