不同粒度粗粒的极限孔隙比和破碎特征

为了研究以石英砂为主要成分的粗粒土压实过程,分别利用量筒倒转法和振动击实试验,测定了不同粒度粗粒的极限孔隙比,分析了极限孔隙比随粒径变化的规律;采用压实容量表征粗粒孔隙比变化范围,探究了压实容量与粒径的关系;开展了不同粒度粗粒和原料土的颗粒破碎特征试验,分析了击实过程中的颗粒破碎特征和演变过程.结果表明:粗粒最大孔隙比随着粒径的增大先快速减小后缓慢增大,最小孔隙比随着粒径的增大线性减小;粗粒土压实容量随着粒径的增大先减小后增大;粗粒土在击实过程中的颗粒破碎量随着粒径的增大线性增大;颗粒破碎使粗粒土向着级配连续的方向发展,粗粒土逐渐趋于均匀化.

Ultimate Void Ratios of Coarse Particles of Different Sizes and Its Particle Breakage Characteristics

To study the compaction of coarse particle soil with quartz sand as the main component, the ultimate void ratios of coarse particle of different sizes were determined by measuring cylinder rotation method and the vibration compaction test respectively. Compaction capacity was used to express the variation range of the void ratio of coarse particle soil. The relationship between compaction capacity and particle size was explored. Particle breakage characteristics of coarse particle and raw soil of different particle sizes were tested, and the characteristics and evolution process of particle breakage during compaction was analyzed. The results show that the maximum void ratio decreases rapidly with the increase of particle size at first and then increases slowly. The minimum void ratio decreases linearly with the increase of particle size. The compaction capacity decreases with the increase of particle size and then increases. The particle breakage of coarse particle soil increases linearly with the increase of particle size during the compaction process, and the coarse particle soil gradually tends to be uniform. The research results have guiding significance for compaction of coarse particle soil with quartz sand as the main component.