摘要
作为岛礁吹填工程的天然地基材料,钙质砂在吹填过程中易形成粗、细粒颗粒含量不同的汇聚层,是影响岛礁工程稳定性的重要因素之一。开展了一系列不同粗粒粒径钙质砂在不同细粒含量条件下的三轴固结排水剪切试验,研究在剪切过程中粗粒粒径和细粒含量对钙质砂剪切特性的影响规律。结果表明:粗粒粒径、细粒含量、围压与钙质砂的应变软化特性和剪胀特性存在高度相关性,随着细粒含量、粗粒粒径和围压的增加,应变软化系数整体呈下降趋势,而剪胀系数整体呈上升趋势,表明试样的硬化效应和剪缩效应增强。
As a natural foundation material for island and reef reclamation projects,calcareous sand is easy to form a convergence layer with different contents of coarse and fine particles during the reclamation process,which is one of the important factors affecting the stability of island and reef projects.In this paper,a series of triaxial consolidated drained shear tests of calcareous sand with different coarse particle sizes and different fine particle contents were carried out to study the influence of coarse particle size and fine particle content on the shear characteristics of calcareous sand during the shear process.The test results show that there is a high correlation between the coarse particle size,fine particle content,confining pressure and the strain softening characteristics and dilatancy characteristics of the sample.With the increase of fine particle content,coarse particle size and confining pressure,the strain softening coefficient generally declines,while the dilatancy coefficient generally increases,indicating that the hardening effect and shear shrinkage effect of the sample are enhanced.
作者
王文军
魏福军
许柯
张阁平
邓坚
陈宾
马杰
夏俊杰
WANG Wen-jun;WEI Fu-jun;XU Ke;ZHANG Ge-ping;DENG Jian;CHEN Bin;MA Jie;XIA Jun-jie(China Nonferrous Metal Industry′s Changsha Survey and Design Institute Co.,Ltd.,Changsha 410011,China;China Railway Seventh Group Co.,Ltd.,Zhengzhou 450016,China;Guangdong Hualu Transport Technology Co.,Ltd.,Guangzhou 510000,China;College of Civil Engineering,Xiangtan University,Xiangtan 411105,China;Hunan Geological Disaster Survey and Monitoring Institute,Changsha 410029,China)
出处
《河南城建学院学报》
2025年第4期13-20,共8页
Journal of Henan University of Urban Construction
基金
国家自然科学基金项目(42207227)
湖南省自然科学基金项目(2022JJ40586)。
关键词
钙质砂
粗粒粒径
细粒含量
剪切特性
calcareous sand
coarse particle size
fine particle content
shear characteristics
