Compression characteristics and particle crushing behavior of coral sand–quartz sand mixture under confined high pressure
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摘要: 珊瑚砂的工程力学特征已被广泛研究，但特殊地域珊瑚砂并不是单独存在，常夹杂硅质杂质等形成珊瑚砂混合料，硅质杂质对珊瑚砂力学变形特性及颗粒破碎的影响机制尚不明晰。本文以标准石英砂充当硅质杂质，开展控制相对密实度和掺砂率的侧限高压压缩试验，对其压缩特性及颗粒破碎规律进行研究。试验结果表明，随着掺砂率的增加，珊瑚砂-石英砂混合料压缩变形逐渐降低，但石英砂未对混合料压缩曲线的变化趋势产生明显影响。相对密实度、竖向压力及掺砂率均对珊瑚砂-石英砂混合料的颗粒破碎构成重要影响。相较于高密实度条件下，低密实度时混合料在压缩过程中引起的颗粒破碎效应更为显著；随着竖向压力的增加，混合料的颗粒破碎效应逐步增大；掺砂率的提高在一定程度上降低了颗粒破碎的发生，这与石英砂较高的颗粒强度等因素密切相关。研究成果可对进一步认识硅质杂质对珊瑚砂压缩变形及颗粒破碎规律的影响提供一定参考和借鉴。Abstract: The special engineering mechanical characteristics of coral sand have been widely studied, but the coral sand in special areas is not isolated and often contains siliceous impurities to form coral sand mixture. The influence mechanism of the siliceous impurities on the mechanical deformation characteristics and particle breakage of the coral sand is still unclear. By using the standard quartz sand as the siliceous impurity, the confined high-pressure compression tests under different initial relative compactnesses and sand mass proportions are carried out to study its compression characteristics and particle crushing rules. The experimental results show that with the increasing proportion of quartz sand mass, the compressive deformation of the coral sand-quartz sand mixture decreases. However, the quartz sand has no obvious influences on the trend of its compression curve. The relative compactness, vertical pressure and sand mass proportion all have important effects on the particle breakage of the coral sand-quartz sand mixture. Compared with that at high compactness, the particle breakage effect of the mixture at low compactness is more significant in the process of compression. With the increase of the vertical pressure, the particle breakage effect of the mixture increases gradually. The increasing proportion of quartz sand mass reduces the occurrence of the particle breakage to a certain extent, which is closely related to the high particle strength of the quartz sand. The research results can provide some references for further understanding the influences of siliceous impurities on the compressive deformation and particle breakage of the coral sand.
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Keywords:
- coral sand /
- mixture /
- confined compression /
- compression deformation /
- particle breakage
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图 6 不同掺砂率条件下珊瑚砂的压缩曲线
Figure 6. Compression curves of coral sand under different sand mixing rates
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图 7 不同密实度条件下珊瑚砂压缩变形曲线
Figure 7. Curves of compressive deformation of coral sand under different compactnesses
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图 9 不同密实度条件下的颗粒破碎率
Figure 9. Crushing rates of particles under different compactnesses
表 1 材料基本物理参数
Table 1 Basic physical indices of materials
材料 最大孔隙比emax 最小孔隙比emin 颗粒相对密度Gs 不均匀系数Cu 曲率系数Cc 珊瑚砂 1.410 0.770 2.739 2.670 1.168 石英砂 0.455 0.725 2.658 6.494 1.044 
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