为了提高沥青路面的摊铺密实度，获得高密实摊铺效果，提出了一种考虑材料特性与摊铺压实力的熨平板-沥青混合料相互作用振动系统动力学模型。通过分析得出了熨平板的振动参数对沥青路面摊铺密实度的影响规律，得到了沥青路面高密实度摊铺的工艺参数范围。基于机械共振理论建立了熨平板压实机构非线性动力学模型，采用等效刚度和等效阻尼表示沥青混合料在摊铺压实过程中获得的压实力，用振幅放大因子β表示振幅的量级，得出了摊铺密实度趋势-振动频率的理论模型。通过分析模型，得到了振动参数和材料特性对摊铺密实度的影响规律，确定了材料高密实度摊铺的参数范围。通过现场试验，验证了工艺参数的高效压实区。研究结果表明：沥青路面高密实度摊铺对应的频率比λ范围是0.9-1.41；连续级配沥青混合料AC-20摊铺频率的高效压实区为33Hz～49Hz；仿真结果与试验结果的变化规律基本一致，模型具有有效性。该研究结果利于提高沥青路面的摊铺密实度，提升路面质量，节约施工成本，为沥青路面的高效压实提供依据。
Abstract
In order to improve the paving compactness of asphalt pavement and the efficiency of paver construction, a dynamic model of the vibration system of screed-asphalt mixture interaction which considered the material properties and paving compaction effort is presented. The influence rule of vibration parameter of screed on the asphalt pavement compactness was analyzed, and the technological parameter range of high compactness paving of asphalt pavement were obtained. Based on the mechanical resonance theory, the nonlinear dynamic model of compacting mechanism of screed was established. The equivalent stiffness and damping were used to represent the compacting force of asphalt mixture obtained in the process of paving compaction, the amplitude amplification factor β was used to express the magnitude of the amplitude, the theoretical model of paving compactness trend and vibration frequency was obtained. By analyzing the model, the effects of vibration parameters and material properties on the paving compactness was obtained, the parameter range of high-compactness paving was determined. The high efficiency compaction zone of technological parameter was verified by field test. The results indicate that the frequency ratio range corresponding to high density paving of asphalt pavement is λ=0.9-1.41; The high efficiency compaction zone of continuous gradation asphalt mixture AC-20 paving frequency is 33Hz ~ 49Hz; the variation rule of the simulation results is basically consistent with the test results, the model has validity. The research results are helpful to improve the compactness of asphalt pavement, improve pavement quality, save construction cost, and provide a basis for effective compaction of asphalt pavement.
关键词
机械工程 /
熨平板 /
沥青混合料 /
动力学模型 /
密实度
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Key words
mechanical engineering /
screed /
asphalt mixture /
dynamical model /
compactness
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