珊瑚砂剪切特性试验分析

发布时间：2018-06-04 01:19

本文选题：珊瑚砂 + 剪切特性　；参考：《解放军理工大学学报(自然科学版)》2017年01期

【摘要】：为了研究珊瑚砂及其与结构接触面的剪切特性,从南海珊瑚岛礁取样,对试样进行颗分试验、直剪试验和扫描电镜观测,进行了珊瑚砂与钢材、混凝土及纤维增强(FRP)复合材料接触面的剪切特性试验。结果表明:试验珊瑚砂样的粒径主要分布在0.3~4.5mm,约占试样总质量的88%;珊瑚砂表现特殊的剪应力-位移曲线,且内摩擦角随粒径的增大而增大;珊瑚砂与FRP复合材料接触面摩擦角小于与混凝土接触面的摩擦角,大于与钢材接触面摩擦角,珊瑚砂与结构接触面摩擦角较石英砂稍大。通过扫描电镜观测发现,大粒径珊瑚砂颗粒有明显的孔洞,粒径较小的颗粒组织结构疏松。将珊瑚砂破碎颗粒质量占试样总质量的比重定义为颗粒破碎率,颗粒破碎率随珊瑚砂粒径的增大而对数增大,随轴向应力的增大而指数增大。
[Abstract]:In order to study the shear characteristics of coral sand and its interface with structure, coral sand and steel were sampled from coral reefs in the South China Sea. Shear behavior test of concrete and fiber reinforced FRP composite interface. The results show that the diameter of coral sand is mainly distributed in 0.3 ~ 4.5mm, accounting for about 88% of the total sample mass, the coral sand exhibits a special shear stress-displacement curve, and the angle of internal friction increases with the increase of particle size. The friction angle of the contact surface between coral sand and FRP composite is smaller than that with concrete and with steel, and the friction angle between coral sand and structure is a little larger than that with quartz sand. By SEM observation, it was found that there were obvious pores in the large diameter coral sand particles, and the microstructure of the smaller grains was loose. The specific gravity of coral sand particle mass to the total sample mass is defined as particle breakage rate. The particle breakage rate increases logarithmic with the increase of coral sand diameter and exponentially with the increase of axial stress.
【作者单位】：河海大学力学与材料学院;解放军理工大学爆炸冲击防灾减灾国家重点实验室;解放军理工大学野战工程学院;解放军理工大学国防工程学院;
【基金】：国家自然科学基金资助项目(51408607) 国家科技支撑计划资助项目(2014BAB15B01)
【分类号】：TU411

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