摘要
利用南海钙质砂和阿拉伯湾钙质砂,进行侧限压缩试验,对其压缩特性进行分析,得到了相应的压缩指数;采用相对破碎率为度量指标,评价了钙质砂在压缩试验过程中的颗粒破碎情况。同时根据试验数据得到了不同初始相对密实度的砂样的塑性功,通过建立塑性功与相对破碎率以及塑性功与压缩指数之间的关系,探讨了颗粒破碎对钙质砂压缩特性的影响。研究显示,在本次试验条件下,颗粒破碎是导致钙质砂压缩变形的主要因素,钙质砂的中值粒径以及碳酸钙含量等因素对其颗粒破碎程度有明显影响;钙质砂的相对破碎率与其输入的塑性功有关,并且受到初始相对密实度的影响,采用相对密实度进行归一化后,两者呈现较好的幂函数关系;通过建立钙质砂压缩指数与塑性功之间的关系,进一步建立了钙质砂的压缩指数与相对破碎率之间的关系,经相对密实度归一化后,两者也呈现幂函数规律,此规律可以用于评价颗粒破碎对钙质砂压缩特性的影响。
This paper analyzes the compression characteristics of calcareous sands from the South China Sea and the Arabian Gulf through a series of oedometer tests.Based on the test results,we obtain the compression index and the plastic work of sand samples with different initial relative density values.At the same time,we evaluate the sand breakage with relative breakage index proposed by Hardin.The relationship between plastic work and relative breakage index as well as compression index is studied to discuss the influence of particle breakage on compression characteristics of calcareous sands.The results show that the mean diameter and the content of calcium carbonate have a significant effect on particle breakage,which is the main factor inducing the compression deformation of calcareous sands.The relative breakage index of calcareous sands mainly associates with the plastic work and the initial relative density.The relationship between relative breakage index and plastic work is a power function by normalizing of relative density.The power function is also satisfactory for the relationship between compression index and relative breakage index.It could be used to evaluate the effect of particle breakage on the compression characteristics of calcareous sands.
作者
李彦彬
李飒
刘小龙
陈文炜
LI Yanbin;LI Sa;LIU Xiaolong;CHEN Wenwei(Geotechnical Institute,Civil Engineering Department,Tianjin University,Tianjin 300072,China;China Ship Research Center,China Shipbuilding Industry Corporation,Wuxi 214082,China)
出处
《工程地质学报》
CSCD
北大核心
2020年第2期352-359,共8页
Journal of Engineering Geology
基金
国家自然科学基金重大项目(资助号:51890911)
工信部高技术船舶科研计划(资助号:2016[22]).
关键词
钙质砂
颗粒破碎
塑性功
侧限压缩
Calcareous sands
Particle crushing
Plastic work
Oedometer test
