路基路面材料室内振动压实动态响应特征分析

Analysis of Dynamic Response Characteristics of Subgrade and Pavement Materials Vibration Compaction

为研究路基路面材料在实际振动压实过程中的动态响应特征演化规律,选取路基土、水泥稳定碎石及沥青混合料三种常用工程材料,通过安装在振动压实仪上的加速度传感器,记录压实过程中动态响应的原始数据。参考目前主流的三种智能压实控制指标(CMV、RMV以及CCV),对加速度传感器采集原始数据进行滤波和快速傅里叶变换,分析相应指标在振动压实过程中的变化规律。结果表明:加速度时频图谱可以将室内振动压实过程划分为三个明显的阶段——初始压实、振动调整以及稳定压实;采用不同压实控制指标,对路面材料压实稳定状态的判定结果不同;不同材料在振动压实过程中,对压实功的动态响应具有一定差异。上述结果对指导现场智能压实的质量控制具有一定的理论意义。

To reveal the evolution of dynamic response characteristics of subgrade and pavement materials in the actual vibration compaction process,three materials including subgrade soil,cement stabilized aggregate and asphalt mixture were studied.Dynamic responses were obtained through the acceleration sensor installed on the vibration compactor.Referring to three intelligent compaction control indices(CMV,RMV and CCV),the original dynamic data were passed through the filter and transformed into the frequency domain by FFT.Then,we analyzed the evolution of the indices during the compaction process.The results showed that,the acceleration timefrequency map could divide the indoor vibration compaction process into three obvious stages:initial compaction,vibration adjustment,and stable compaction.Different compaction control indices had different determination point for the stable state of pavement material compaction.Different materials had a certain difference in the dynamic response of the compaction work during the process.The above results had certain theoretical significance for guiding on-site intelligent compaction quality control.