细砂路基碾压密实的颗粒流模拟与试验验证

发布时间：2018-01-09 13:08

本文关键词：细砂路基碾压密实的颗粒流模拟与试验验证　出处：《同济大学学报(自然科学版)》2017年04期 　论文类型：期刊论文

【摘要】：利用PFC2D软件建立了模拟细砂路基密实过程的颗粒流模型,研究了碾压方式、静碾作用力大小、振动碾压遍数对细砂密实情况的影响,并通过现场试验进行了验证.结果表明,细砂的碾压机理主要包括颗粒挤密和长轴定向;静碾作用下,细砂孔隙率减小值沿深度方向无明显差异,且颗粒长轴的方向性改变不显著;振动碾压时,细砂上部孔隙率的减小较静碾更为明显,且颗粒长轴与水平方向夹角小于30°的颗粒数量增加了33.3%;增加振动碾压遍数可使细砂上部的孔隙率进一步减小,但5遍后增加振碾次数对密实度的提升效果不再明显;模拟结果与现场试验结果较为吻合,颗粒流模拟结果可供实践参考.
[Abstract]:A simulation of sand subgrade compaction process of the particle flow model by using PFC2D software, on the way of rolling, static compaction force, the influence of vibration compaction times of fine sand compacting conditions, and verified by field test. The results show that the main compaction mechanism of fine sand particles including compaction and static axis orientation; run under the action of fine sand porosity decreases along the depth direction has no obvious difference, and the direction of the major axis of particles did not change significantly; vibration compaction, reduce fine sand upper porosity is more obvious than static roller, and the number of particles and the long axis of the horizontal angle is less than 30 degrees of particles increased by 33.3%; the increase of vibrating roller the number of times the fine sand upper porosity further decreases, but 5 times increase the vibration compaction times is no longer obvious on the compactness of lifting effect; simulation results coincide with the field test results, the simulation results for particle flow Practice reference.

【作者单位】：同济大学道路与交通工程教育部重点实验室;
【基金】：交通部西部交通建设科技项目(2013319223010,2015318822170)
【分类号】：U416.1
【正文快照】： 细砂材料本身强度较高,经有效密实达到规定标准后,整体模量可很好地满足规范要求,可用于少土地区路基结构的修筑[1-2].但由于影响细砂密实的因素较多,包括较不规则的颗粒外观、不同的含泥量,以及密实过程中的扰动等,故其现场密实和质量控制一直是细砂路基修筑的难点[3-4].国内

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