【摘要】 基于PFC3D离散元软件,建立了撒布型正纹理抗滑磨耗层的离散元模型.对比磨耗层离散元模型与室内试件的纹理特征,验证了基于离散元模型进行纹理研究的可行性.分析了配合质量比、压实次数等参数对磨耗层表面纹理特征的影响.结果表明,纹理偏度和平均断面深度随粗集料质量.分数的增加先减小后增大,随油石质量比的增加而降低.公称最大粒径的影响最为显著,当其为4.75 mm时磨耗层的正纹理水平较高且抗滑性能良好,推荐在工程实践中使用该粒径集料.随压实次数的增加,纹理偏度和平均断面深度的下降趋势均逐渐平缓,压实7次后纹理指标接近稳定.更多还原

【Abstract】 A discrete element model of spreading positive texture skid-resistant friction course was established based on the PFC3D discrete element software.The feasibility of texture research based on the discrete element model was verified by comparing the texture characteristics of the discrete element model of friction course with those of the specimen prepared in the laboratory.The effects of the parameters such as the mix mass ratio and the compaction times on the surface texture of the friction course were analyzed.The results show that the texture skewness and the mean profile depth firstly decrease and then increase with the increase of the mass ratio of coarse aggregate,while decrease with the increase of the oil-aggregate mass ratio.The influence of the nominal maximum aggregate size is the most significant.When the nominal maximum aggregate size is 4.75mm,the friction course has higher positive texture level and better skid resistance.Therefore,it is recommended to use this size of aggregate in the construction practice.With the increase of the compaction times,the decreasing trends of both the texture skewness and the mean profile depth become gradually moderate.After 7times of compaction,the indexes basically approach stable.更多还原