基于层间抗剪强度的同步碎石下封层的设计  

Design of synchronous under-seal based on anti-shear strength between interlayers

作　　者：周泽洪[1] 郑南翔[1] 纪小平[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2011年第2期21-24,共4页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200831800029)

摘　　要：针对同步碎石下封层的使用性能要求,提出了以层间抗剪强度作为设计指标的力学-经验设计法,采用McLeod经验法预估沥青用量,以预估的沥青用量作为中值成型5组不同沥青用量下的复合试件,进行了抗剪强度试验,以抗剪强度最大值对应的沥青用量作为最佳沥青用量;对只设置透层和透层+同步碎石封层的复合试件进行了抗剪、车辙和渗水对比试验。研究结果表明:力学-经验法设计的沥青用量比McLeod经验法降低约0.261kg/m2;相比透层复合试件,透层+同步碎石封层可提高复合试件的界面抗剪强度和车辙动稳定度约141%和27.6%,能够明显改善复合试件的抗渗性能。The mechanistic-empirical design method of synchronous under-seal was studied based on its performance requirements.In this method the anti-shear strength between interlayers was taken as design index.The first step was to estimate asphalt content with McLeod empirical design method,and then 5 kinds of specimens were formed with different asphalt contents and the estimated content set as the middle value,then the shear strength tests of the 5 kinds of specimens were carried out.Finally,the asphalt content with the maximum shear strength was set as the optimum content.At the same time,the shear test,rutting test and seepage test were carried out to the two kinds of composite specimens： with only prime coat layer and with prime coat ＋synchronous under-seal.The results show that： the mechanistic-empirical design method can reduce the more asphalt content than the McLeod＇s,reduced by about 0.261 kg/m^2;the synchronous under-seal can improve the interface resistance shear strength and dynamic stability,raised about 141% and 27.6% compared with the prime coat＇s;the impermeability of composite specimens can be significantly improved by using synchronous under-seal.4 tabs,3 figs,8 refs.

关 键 词：道路工程 同步碎石封层 设计方法 层间抗剪强度 

分 类 号：U416.14[交通运输工程—道路与铁道工程]