摘要
为了提高双钢轮振动压路机对路面的压实质量与压实效率,需确定出良好的压实速度与振动频率的匹配关系。从双钢轮振动压路机与路面的接触截面分析入手,基于半功率点的概念,提出有效接触宽度的概念并建立数学模型;在已有冲击间距理论基础上,引入重叠度来重新定义压实速度与振动频率的对应关系,并将有效接触宽度模型和重叠度值指标应用于沥青混合料压实试验进行验证。研究结果表明:有效接触宽度的概念模型可以作为选择双钢轮振动压路机工艺参数组合时的理论依据,在压实过程中随着碾压遍数的增加,材料由塑性逐渐变为弹性,有效接触宽度修正系数m由0.5~1.0逐渐变化;通过控制重叠度的大小,在相同压实遍数时材料的均匀性不同,当选取的重叠度获得的均匀性较好时,所对应的振动频率与压实速度具有较好的匹配关系;AC-13沥青混合料的压实试验结果与理论结果吻合较好,当变异系数为0.4%时既可以保证压实度的均匀性,又可以保证压实效率,得出的压路机高频振动下每遍的压实速度能保证压实质量,路面压实度和平整度均符合沥青混合料高速公路交工验收标准。由有效接触宽度模型和重叠度概念确定的压实速度与振动频率的参数组合为提高路面压实质量提供了理论保障。
In order to improve the compaction quality and compaction efficiency of double-drum vibratory roller on pavement,the good matching relationship between compaction velocity and vibration frequency was determined.From the analysis on contact section between double-drum vibratory roller and pavement,and on the basis of half-power point,the concept of effective contact width of double-drum vibratory roller was put forward and its mathematical model was presented.Based on the existing impact spacing theory,the degree of overlap was introduced to redefine the corresponding relation of compaction velocity and vibration frequency.And the modelof effective contact width and index of overlap degree were used in the compaction test of asphalt mixture to verify it.The results show that the conceptual model of effective contact width can be used as the theoretical basis for selecting the process parameters combination of double-drum vibratory roller.It can be pointed out that with increasing rolling times in the compaction process,material is changed from plastic to elastic and correction coefficient of effective contact width gradually changes from 0.5 to 1.0.By controlling the size of degree of overlap,materials after the same compaction times will have different degree of uniformity.When the selected degree of overlap obtains good uniformity,the corresponding compaction velocity and vibration frequency has good matching relationship.The compaction test results of AC-13 asphalt mixture are in good agreement with the theoretical results.When the variation coefficient is 0.4%,compaction uniformity and compaction efficiency can be guaranteed.Then the compaction velocity of roller in every compaction time under high frequency vibration is also obtained.The pavement compactness and smoothness are in accordance with the acceptance standard of asphalt mixture highway.The parameter combination of compaction velocity and vibration frequency determined by the model of effective contact width and the concept of overlap degree provides
作者
焦生杰
徐清刚
刘秋宝
张翠红
JIAO Sheng-jie;XU Qing-gang;LIU Qiu-bao;ZHANG Cui-hong(Highway Maintenance Equipment National Engineering Laboratory, Chang＇an University, Xi＇an 710064, Shaanxi, China;Sany Heavy Industry Co. , Ltd. , Changsha 410100, Hunan, China)
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第2期120-126,共7页
Journal of Chang’an University(Natural Science Edition)
基金
"十二五"国家科技支撑计划项目(2015BAF07B08)
陕西省自然科学基础研究计划项目(2017JQ5081)
关键词
机械工程
双钢轮振动压路机
有效接触宽度
重叠度
压实速度
振动频率
mechanical engineering
double-drum vibratory roller
effective contact width
degreeof overlap
compaction velocity
vibration frequency
