水文地质工程地质2026，Vol.53Issue(1)：1-11,11.DOI:10.16030/j.heg.202509017
细颗粒空间分布对岛礁珊瑚砂不排水剪切特性影响研究
Study on the influence of fine particle spatial distribution on the undrained shear properties of coral sand from reef island
摘要
Abstract
Coral sand is a crucial geotechnical material for the construction of islands and reefs in the South China Sea.In many reclamation areas,the particle size distribution of coral sand spans a wide range,encompassing sizes from sand particles to fine particles.During the reclamation of reef islands,coral sand and fine particles form a heterogeneous,layered structure.However,the influence of this stratified structure,particularly the concentrated distribution of fine particles,on the strength and deformation of the coral sand layers remains unclear.This study conducted a series of undrained triaxial shear tests on coral sand-fine particle mixture samples to investigate the effects of effective confining pressure and the spatial distribution of fine particles on the mechanical properties of coral sand.The experimental results indicate that,under the same fine particle content,the strength of samples with uniformly distributed coral sand and fine particles is significantly lower than that of samples with layered fine particle distribution.Both the apparent cohesion and internal friction angle increase with the number of fine particle interlayers.Variations in the spatial distribution of fine particles lead to different undrained shear behaviors.In the e-p'plane,the critical state line of coral sand shifts upward as the number of fine particle layers increases.The stratified structure formed in coral sand islands and reefs under processes such as hydraulic sorting can enhance their overall strength.Conventional homogenization methods for fine particles may underestimate the actual bearing capacity of such stratified coral sand layers.This study provides theoretical insights for the treatment of foundations containing fine-grained coral sands in the South China Sea.关键词
珊瑚砂/细颗粒/剪切特性/静态液化/摩擦角Key words
coral sand/fine particles/shear characteristics/static liquefaction/friction angle分类
海洋科学引用本文复制引用
吴杨,潘麟轩,罗泱知,崔杰,吕海波,曾召田,甘彬宏..细颗粒空间分布对岛礁珊瑚砂不排水剪切特性影响研究[J].水文地质工程地质,2026,53(1):1-11,11.基金项目
国家自然科学基金项目(52222809 （）
52178322 （）
52311540020 （）
52578395) （）
广东省自然科学基金面上项目(2024A1515010170) （2024A1515010170）
广州市科技计划项目(2024A04J4771 （）
2025A03J3116) （）
