土工基础

土工基础 ›› 2022, Vol. 36 ›› Issue (3): 451-454.

• 测试技术 • 上一篇    下一篇

相对密度对珊瑚砂强度及变形性质的影响研究

黄孝芳1,2,3，孟庆山3，蒋 雪1,2,3   

  1. （1.桂林理工大学 土木与建筑工程学院，广西桂林 541004；2.广西岩土力学与工程重点实验室，广西桂林 541004；3.中国科学院武汉岩土力学研究所，武汉 430071）
  • 收稿日期:2021-01-17 修回日期:2021-01-25 出版日期:2022-06-30 发布日期:2022-06-26
  • 作者简介:黄孝芳（1994-），女，硕士，研究方向为珊瑚砂等海洋岩土工程。
  • 基金资助:
    国家自然科学基金项目（No.41877267）；中国科学院战略性先导科技专项（A 类）（No.XDA13010201）

Influence of Relative Density on the Strength and Deformation Properties of Coral Sand Samples

HUANG Xiaofang1,2,3, MENG Qingshan3, JIANG Xue1,2,3   

  1. (1.College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004;
    2.Guangxi Key Laboratory of Rock and Soil Mechanics and Engineering, Guilin, 541004;
    3.Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071)
  • Received:2021-01-17 Revised:2021-01-25 Online:2022-06-30 Published:2022-06-26

摘要： 针对珊瑚砂特殊的物理性质，开展了不同相对密度试样的三轴固结不排水剪切试验，分析不同相对密度对珊瑚砂对其应力应变关系、强度及变形特性的影响，试验分析得出：密度对珊瑚砂的应力应变关系影响较大，相对密度增大，试样的峰值偏应力逐渐增大；割线模量E1随围压和相对密度的增加而增大，E1随围压的变化具有良好的线性关系；随着密实度的增加，强度指标c值和φ值都随密实度的增大而增大，密实度对珊瑚砂的黏聚力影响较大，对内摩擦角影响较小。

关键词: 珊瑚砂, 三轴试验, 相对密度, 应力应变, 强度

Abstract: Focused on the special physical properties, a series of triaxial consolidated undrained shear test of different relative density of coral sand samples were performed to analyze the influence of the different relative density on the stress-strain relationship. Throughout the analysis of test results, it is concluded that the density has a significant influence on the stress-strain relationship of the coral sand. With the relative density increase, the peak deviator stress of the sample gradually increases; the secant modulus, E1, increases with the increase of the confining pressure and the relative density , E1 has a good linear relationship with the change of the confining pressure; as the density increases, the strength indices, c and φ values, both increase with the increase of the density, and the density has a greater impact on the cohesion of the coral sand sample and has little effect on the angle of internal friction. 

Key words: coral sand, triaxial shear test, relative density, stress-strain, strength

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