珊瑚砂与土工格栅界面的大规模直接剪切试验

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN
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引用次数: 0

摘要

为研究珊瑚砂与土工格栅界面的剪切行为,进行了大规模直接剪切试验。聚丙烯双轴土工格栅被嵌入两种粒度分布的珊瑚砂中,分别是原位珊瑚砂(ISG)和来自中国南海西沙群岛的均匀级配珊瑚砂(UG)。研究结果显示了这两种珊瑚砂的应变软化行为。ISG 珊瑚砂的峰值剪切强度高于 UG 珊瑚砂,因为 ISG 珊瑚砂的相对密度更高。峰值剪应力与法向应力呈双线性关系,分界点为 100 kPa 法向应力。这是因为当法向应力达到 100 kPa 时,珊瑚砂的剪切位移从剪切扩张转为剪切收缩,从而增强了内聚力。珊瑚砂颗粒的不规则形状和土工格栅的强相互作用导致珊瑚砂的界面剪切系数高于硅砂。研究发现,随着法向应力的增加,颗粒的相对破碎率也在增加,而 ISG 珊瑚砂的破碎率更高。加筋珊瑚砂和未加筋珊瑚砂的颗粒破碎率非常接近,表明在珊瑚砂中应用土工格栅对颗粒破碎率影响不大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Large-scale direct shear test of the interface between coral sand and geogrid

Large-scale direct shear tests were conducted to investigate the shear behavior of the interface between coral sand and geogrid. Polypropylene biaxial geogrid was embedded in the coral sands with two grain size distributions, which were in-situ coral sand (ISG) and uniformly graded coral sand (UG) from the Paracel Islands in the South China Sea. The results revealed the strain-softening behavior of both coral sands. The peak shear strength of the ISG coral sand was higher than that of the UG coral sand since the relative density of the ISG coral sand was higher. A bilinear relationship of peak shear stress versus normal stress was observed, with a dividing point of 100 kPa normal stress. This is because the shear displacement of the coral sand transferred from shear dilatancy to shear contraction when the normal stress reached 100 kPa, which enhanced the cohesion. The irregular shape of coral sand particles and the strong interaction of the geogrid contribute to a higher interface shear coefficient of coral sand, compared with silicious sand. The relative particle breakage was found to increase as the growth of the normal stress, and breakage was more significant in the ISG coral sand. The particle breakage rate of the reinforced and unreinforced coral sand was very close to each other, indicating that the application of geogrid in coral sand has little effect on the particle breakage rate.

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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
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