细颗粒珊瑚砂、石英砂、黏性土蠕变特征对比研究

Comparative Study on Creep Characteristics of Fine Coral Sand,Quartz Sand and Cohesive Soil

珊瑚砂吹填地基主要由耙吸或绞吸吹填的珊瑚砂、珊瑚枝、礁灰岩碎块构成,珊瑚砂颗粒大小不均、分布无规律,颗粒存在棱角和内孔隙,珊瑚砂地基的长期缓慢变形是建构筑物变形控制的重点。通过室内135天的蠕变试验,将细颗粒珊瑚砂、石英砂、黏性土的蠕变特征进行对比分析发现,细颗粒珊瑚砂与石英砂的蠕变特征相似,与黏性土存在明显区别,在较低荷载水平下,细颗粒珊瑚砂地基的长期变形可依据石英砂的研究成果进行估算。

The hydraulic fill foundation for coral sand is mainly composed of coral sand,coral branches and reef limestone fragments,which are dredged by trailing suction or cutter suction.The coral sand particles are uneven in size and irregular in distribution,with edges and internal pores.The long-term slow deformation of coral sand foundation is the key point of deformation control of buildings.Through the creep test indoor in 135 days,the creep characteristics of fine coral sand,quartz sand and cohesive soil are compared and analyzed.It is found that the creep characteristics of fine coral sand and quartz sand are similar,and they are obviously different from cohesive soil.Under lower load level,the long-term deformation of fine coral sand foundation can be estimated based on the conclusions from quartz sand.