粒径对珊瑚砂压缩性能影响的试验分析

Experimental Analysis of Influence of Particle Size on Compression Performance of Coral Sand

以南海某岛礁珊瑚砂为研究对象,通过试验分析粒径对珊瑚砂压缩性能的影响。在试验中,对干燥后的珊瑚砂试样进行筛分,获得不同粒径的珊瑚砂组别及其颗粒级配曲线。采用万能材料试验机对不同粒径的珊瑚砂进行准静态压缩试验,结果表明:试验所用的珊瑚砂为连续性较好、级配良好的砂;在给定初始预压力的条件下,粒径越大,同等质量的珊瑚砂初始密度越小;随着粒径的增大,珊瑚砂的压缩性能越来越好;同等应力条件下,粒径越大的珊瑚砂具有越大的压缩应变;单一粒径的珊瑚砂应力应变曲线和试样初始密度有极大相关性,试样初始密度越大,珊瑚砂压缩性能越差。

Taking the coral sand of a certain island reef in the South China Sea as the research object,the influence of particle size on the compression performance of the coral sand was analyzed through experiment. In the test,the dried coral sand samples were sieved to obtain coral sand groups of different particle sizes and their gradation curve. A quasi-static compression test was carried out on the coral sands of different particle sizes with a universal material testing machine,and the results showed that the coral sand used in the test is sand with good continuity and good gradation. Under the condition of a given initial pre-pressure,the larger the particle size,the lower the initial density of the coral sand of the same quality. As the particle size increases,the compression performance of the coral sand gets better and better. Under the same stress condition,the larger the particle size of the coral sand,the larger the compressive strain. The stress-strain curve of a single particle size coral sand has a great correlation with the initial density of the sample. As the initial density of the sample is getting larger,the compression performance of the coral sand is getting worse.