水泥稳定碎石拉压不同力学特性研究  

Study on Different Mechanical Properties of Cement Stabilized Macadam under Tension and Compression

作　　者：潘勤学[1] 姜舜君 郑健龙[1] 吕松涛[1] 张军辉 宋小金 PAN Qinxue;JIANG Shunjun;ZHENG Jianlong;LÜSongtao;ZHANG Junhui;SONG Xiaojin(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Zhongteng Zhixin Technology(Hunan)Co.,Ltd.,Changsha 410036,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]中腾智信科技(湖南)有限公司,湖南长沙410036

出　　处：《湖南大学学报（自然科学版）》2024年第11期218-230,共13页Journal of Hunan University:Natural Sciences

基　　金：国家重点研发计划项目(2021YFB2600900,2023YFB2603500);国家自然科学基金资助项目(52378441,51908071);湖南省交通运输厅科技进步与创新计划项目(202107)。

摘　　要：为解决现行路面结构设计参数及其取值与材料实际力学特性不匹配的问题,选取典型水泥稳定碎石开展了不同水泥剂量与加载速度下的单轴压缩及直接拉伸试验,研究了其应力应变特性,并分析了压拉强度、模量及泊松比的变化规律及其相互关系,揭示了水泥稳定碎石的拉压不同力学特性.结果表明:水泥稳定碎石拉压受力状态下的应力应变性质符合双模量理论的双线性特征,2%~3%水泥剂量范围为水泥稳定碎石力学本质特性发生变化的过渡区;水泥稳定碎石的拉压力学参数与加载速度和水泥剂量均呈良好的非线性变化关系;就影响因素而言,水泥剂量对材料拉压参数的影响程度远大于加载速度;就力学参数而言,模量受水泥剂量和加载速度的影响最大,其次为强度,最后为泊松比,且相较于抗压,抗拉力学参数受这2种因素的影响更为显著;压拉模量比及压拉泊松比的比值受加载速度和水泥剂量的影响较小,压拉强度比随水泥剂量的增大而逐渐减小,当水泥剂量超过3%时,压拉强度比趋于稳定,据此建立了水泥稳定碎石的拉压力学参数量化取值模型.研究结果可为基于双模量理论的路面结构设计参数取值提供依据.To solve the problem of mismatch between design parameters and actual mechanical properties of pavement structure,typical cement stabilized macadam was selected to carry out uniaxial compression and direct tensile tests under different cement dosages and loading speeds.The stress-strain characteristics were studied,and the variation of compressive and tensile strength(Rc&Rt)/modulus(Ec&Et)/Poisson’s ratio(μc&μt)and their relationships were analyzed,revealing the different mechanical properties of cement stabilized macadam under tension and compression.The results show that the stress-strain properties of cement stabilized macadam under tension and compression are in accordance with the bilinear characteristics of bi-modulus theory.A cement dosage range of 2%to 3%is identified as the transition zone where the mechanical properties change.The tensile and compressive parameters exhibit a strong nonlinear relationship with the loading speeds and cement dosages.Among the influencing factors,the influence of cement dosage on tensile and compressive parameters is much greater than the loading speed.In terms of mechanical parameters,the modulus is most affected by cement dosage and loading speed,followed by strength,and Poisson’s ratio.Compared with compressive parameters,tensile parameters are more significantly affected by these two factors.The Ec/Et and theμc/μt are less affected by loading speed and cement dosage.The Rc/Rt decreases gradually with the increase of cement dosage.When the cement dosage exceeds 3%,the Rc/Rt tends to be stable.Based on these findings,a quantitative value model for the tensile and compressive mechanical parameters of cement stabilized macadam is established.The research results can provide a basis for the parameter value of pavement structure design based on bimodulus theory.

关 键 词：道路工程 路面材料 力学参数 水泥稳定碎石 拉压不同特征 力学特性 

分 类 号：U416[交通运输工程—道路与铁道工程]