云南红黏土路基填料压实特性试验研究  

Research on Compaction Characteristics of Yunnan Red Clay Subgrade Filler

作　　者：裘友强 张留俊[1,3] 尹利华[1] 李向东[3] QIU You-qiang;ZHANG Liu-jun;YIN Li-hua;LI Xiang-dong(Shaanxi Key Laboratory of Road Disaster Prevention,CCCC First Highway Consultants Co.Ltd.,Xi'an 71oo75,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Highway,Chang'an University,Xi'an 710064,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司、陕西省公路交通防灾减灾重点实验室,西安市710075 [2]北京科技大学土木与资源工程学院,北京市100083 [3]长安大学公路学院,西安市710064

出　　处：《公路》2023年第10期91-98,共8页Highway

基　　金：国家重点研发计划项目,项目编号2016YFC0802203。

摘　　要：为了更全面研究云南红黏土用作路基填料的压实特性,以云南蒙文砚高速公路沿线红黏土为研究对象,首先采用室内重型击实试验对比分析了不同成型方法和击实功对其压实特性的影响;然后采用振动压实试验对比分析了不同振动频率、振动幅度和含水率对其压实特性的影响,并与重型击实试验结果进行对比分析;最后通过现场试验段检测,提出了一种夹层型红黏土路基填筑结构和相应的压实参数及压实工艺。结果表明,采用重型击实时,湿法获取的击实曲线比干法获取的击实曲线更为平缓,更有利于控制施工中红黏土的含水率;击实次数越多,云南红黏土的最大干密度越大、最佳含水率越小,但两者变化幅度均较小,增加击实功对偏湿的云南红黏土收效甚微。采用振动压实时,云南红黏土的干密度随振动频率或含水率的增大呈现先增大后减小的趋势,但随振动幅度的增加而不断增大,其最佳振动频率为35 Hz、最佳振动幅度为0.8 mm;相较于重型击实法,采用振动压实测得云南红黏土的最大干密度更小、最佳含水率更大,意味着云南红黏土的振动压实效果较差。现场施工时,夹层型红黏土路基碾压含水率宜为27%~29%、松铺厚度宜为25 cm、碾压遍数宜选用静压1遍+弱振1遍+强振4遍的工况。以上结果有助于为云南地区红黏土路基的现场施工与设计提供参考。In order to more comprehensively study the compaction characteristics of Yunnan red clay when used as subgrade filler,the red clay along Yunnan Mengzi-Wenshan-Yanshan Expressway is taken as the research object.Firstly,the influence of different forming methods and compaction effort on its compaction characteristics are compared and analyzed by indoor heavy compaction test.Then,the influence of different vibration frequency,vibration amplitude,moisture content on its compaction characteristics are compared and analyzed by vibration table compaction test,and the results are compared with those of heavy compaction test.Finally,a sandwich-type red clay subgrade filling structure and the corresponding compaction parameters and compaction technology are proposed through the on-site test section.The results show that(1)when using heavy compaction,the compaction curve obtained by wet method is more gentle than that obtained by dry method,which is more conducive to controlling the moisture content of red clay during construction.With the increase of compaction times,the maximum dry density of Yunnan red clay increases and the optimal moisture content decreases,but the change range of both is small,indicating that increasing compaction work has minor impact on the wet Yunnan red clay.(2)When using vibration compaction,the dry density of Yunnan red clay increases first and then decreases with the increase of vibration frequency or water content,but increases with the increase of vibration amplitude.The optimal vibration frequency is 35 Hz and the optimal vibration amplitude is 0.8 mm.Compared with the heavy compaction method,the maximum dry density of Yunnan red clay measured by vibration compaction is smaller and the optimal moisture content is larger,which means that the vibration compaction effect of Yunnan red clay is poor.(3)In the field construction,the rolling water content of sandwich-type red clay subgrade should be 27%~29%,the thickness of loose paving should be 25 cm,and the rolling times should be 1 time of stat

关 键 词：道路工程 路基填料 压实特性 试验分析 云南红黏土 含水率 干密度 

分 类 号：U416.1[交通运输工程—道路与铁道工程] TU432[建筑科学—岩土工程]