细粒含量对岛礁吹填珊瑚砂最大动剪切模量影响的试验研究

doi:10.13722/j.cnki.jrme.2021.0115

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摘要岛礁工程现场调查资料表明，吹填地层中部分区域的珊瑚砂颗粒级配曲线分布较宽，其粒组是由粗、细颗粒混合构成，比例也不尽相同。南海位于我国地震多发、频发海域，掌握珊瑚砂的动力特性对于开展岛礁场地地震反应分析就显得尤其重要。针对取自南海某岛礁的珊瑚砂–细粒混合物，开展一系列共振柱试验，探明密实度、固结压力和细粒含量对吹填珊瑚砂–细粒混合物小应变动力特性的影响机制。试验过程中，采用控制击实能量的方法制备不同密实程度的珊瑚砂–细粒混合试样。试验结果表明，珊瑚砂的最大动剪切模量随着密实度和固结压力的增加而显著增大。相同试验条件下，珊瑚砂最大动剪切模量随细颗粒含量的增大而减少，这主要是由于试样中存在的细粒改变了颗粒之间的接触样式和骨架结构。对于含有大量细粒的珊瑚砂而言，传统的孔隙比不能合理描述混合物“真实”的密实程度和表征细粒对混合物“骨架结构”的贡献作用。基于等效骨架孔隙比概念，提出一个能够综合考虑细粒含量、密实度和固结压力影响的珊瑚砂–细粒混合物最大动剪切模量的预测模型。研究结果旨在为岛礁珊瑚砂场地地震反应分析提供数据参考。

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	吴杨1
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	李晨2
	温丽维2
	单振东1
	廖静容2

关键词 ：土力学, 珊瑚砂, 细颗粒, 动剪切模量, 阻尼比, 等效骨架孔隙比

Abstract：The reef reclamation field survey results indicate that grain size distribution curves of coral sand in partial regions of coral ground layers，composed of coarse-grained and fine-grained particles in different proportions，are quite wide. Moreover，grasping the dynamic properties of coral sand in South China Sea where earthquakes frequently occur is significantly important for ground response analysis of reclamation reef islands. A series of resonant column tests were performed on coral sand-fines mixtures to investigate the influences of the density，the confining pressure and the fine content on their dynamic characteristics at small level strain in this study. The study employs the tamping energy method to prepare the coral sand-fine mixtures at different densities. The results indicate that the maximum dynamic shear modulus increases with increasing the density and the confining pressure. Under the same test condition，the maximum dynamic shear modulus decreases with increasing the amount of fines，due to that the presence of fines between coarse grains changes the contact condition between grains and the skeleton structure. The traditional expression of the void ratio has no capacity of describing the “real” compaction state of coral sand-fine mixtures and characterizing the role of fines in contributing the skeleton structure of sand. Based on the concept of the equivalent skeleton void ratio，an experienced model jointly considering the effects of the fine content，the density and the confining pressure is proposed to estimate the maximum dynamic modulus of coral sand-fine mixtures. This study is expected to provide a database for island reclamation site earthquake response analysis.

Key words： soil mechanics coral sand fines dynamic shear modulus damping ratio equivalent skeleton void ratio

引用本文:

吴杨1，2，崔杰1，2，李晨2，温丽维2，单振东1，廖静容2. 细粒含量对岛礁吹填珊瑚砂最大动剪切模量影响的试验研究[J]. 岩石力学与工程学报, 2022, 41(1): 205-216.
WU Yang1，2，CUI Jie1，2，LI Chen2，WEN Liwei2，SHAN Zhendong1，LIAO Jingrong2. Experimental study on the effect of fines on the maximum dynamic shear modulus of coral sand in a hydraulic fill island-reef. , 2022, 41(1): 205-216.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0115 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I1/205

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