振动轮下土壤的动态响应分析

Its Influencing Factors on Stress Distribution of Soil Under Vibration Drum

为了研究振动轮下土壤的动态响应及振动参数对土壤竖向应力的影响,利用Ansys/Ls-Dyna3D软件建立了振动轮-土壤模型,并进行了数值模拟分析和试验验证。结果表明,振动轮下土壤的竖向应力值高、能量密度大的范围近似为一个椭球体;土壤的竖向应力沿轮宽方向对称分布,随土壤深度的增加迅速衰减,近似负幂函数衰减;随着振幅的增加,不同深度处的土壤竖向应力均随之增加;随着碾压速度的增加,土壤的竖向应力随之减小,在某一共振频率范围内,土壤能获得较好的压实效应。

In order to research dynamic response and the stress distribution of soil under vibration drum,the vibration drum-soil model is calculated using Ansys/Ls-Dyna3D and some compaction experiments is also made.The results indicate that the higher vertical stress and energy density range is like a ellipsoid.The vertical stress of soil is symmetry along the drum width and its attenuation is rapid with the soil depth.The vertical stress increases with the amplitude in the soil depth.However,the vertical stress decrease with the increase of compaction speed.It is helpful to improve the compaction ability within a particular resonance frequency range.