基于多参数的级配碎石力学性能预估模型  

A prediction model for mechanical properties of graded macadam based on multi-parameters

作　　者：王芳[1] 刘凯[2] 金灿[2] 王源容[3] 高海云[3] 

机构地区：[1]安徽建筑大学土木工程学院,安徽合肥230601 [2]合肥工业大学交通运输工程学院,安徽合肥230009 [3]合肥市重点工程建设管理局,安徽合肥230001

出　　处：《广西大学学报（自然科学版）》2014年第4期870-875,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51108150);安徽高校省级优秀青年人才基金项目(2013SQRL046ZD);安徽高校省级科学研究项目(KJ2013B063);合肥市重点工程建设管理局科技项目(2011CGAZ1153)

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。In order to determine the mechanical properties of graded macadam, the influence of gra-dation 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 pre-diction 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 is 1. 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 den-sity 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 properties of graded macadam, provide test support for gradation design, and determine construction technology.

关 键 词：道路工程 级配碎石 力学性能 预估模型 多参数拟合 

分 类 号：U416.214[交通运输工程—道路与铁道工程]