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砂-聚苯乙烯颗粒填料是一种以砂土和聚苯乙烯颗粒组成的轻质混合填料。通过轻质填料的直剪试验,研究其剪切强度的特性、强度影响因素及其机制。研究发现,轻质填料的剪切强度具有最优含水率(本文为10%),若大于或者小于最优含水率,剪切强度都将减小;轻质填料的剪切强度主要由4个分量构成:颗粒滑动、剪胀、挤碎和重新排列,以及因聚苯乙烯收缩而引起的颗粒移动和重排分量;轻质填料的剪切强度还受聚苯乙烯含量及法向应力(或围压)的影响,其剪切强度随聚苯乙烯含量的增加而减小,随法向应力的增加而增加;轻质填料的内摩擦角随着配比的增加而减小,凝聚力随配比的增加而增大。
Sand - Polystyrene Particle Filling is a light weight, mixed filler of sand and polystyrene particles. Through the direct shear test of light weight filler, the characteristics of shear strength, the influencing factors of strength and its mechanism were studied. The study found that the shear strength of lightweight filler has the optimal moisture content (10% in this paper), and the shear strength will be reduced if the shear strength is less than or equal to the optimum moisture content. The shear strength of lightweight filler mainly consists of 4 Component composition: Particle sliding, dilatancy, crushing and rearrangement, and particle movement and rearrangement due to polystyrene shrinkage; Shear strength of lightweight fillers is also affected by polystyrene content and normal stress (or Confining pressure), the shear strength decreases with the increase of polystyrene content, and increases with the increase of normal stress. The internal friction angle of light filler decreases with the increase of the ratio, Than the increase and increase.