True Triaxial Shear Test and Constitutive Model Study of the Effect of Depositional Angle on the Mechanical Characteristics of Coral Sand

Wu Wenhao; Wu Yang; Peng Weifeng; Huang Yunlong; Zhang Xiaoyan; Chen Bi

doi:10.12052/gdutxb.250026

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True Triaxial Shear Test and Constitutive Model Study of the Effect of Depositional Angle on the Mechanical Characteristics of Coral Sand

更新时间：2026-05-27

- True Triaxial Shear Test and Constitutive Model Study of the Effect of Depositional Angle on the Mechanical Characteristics of Coral Sand
- Vol. 42, Issue 2, Pages: 121-128(2025)
- 作者机构：
  
  1. 广州大学土木与交通学院,广东,广州,510006
  2. 中国矿业大学(北京) 力学与建筑工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.12052/gdutxb.250026
  CLC： TU411
- Published：2025
- 稿件说明：
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邬文浩, 吴杨, 彭伟锋, 等. 沉积角对岛礁珊瑚砂力学特性影响的真三轴试验及本构模型研究[J]. 广东工业大学学报, 2025, 42(2): 121–128.

Wu Wenhao, Wu Yang, Peng Weifeng, et al. True Triaxial Shear Test and Constitutive Model Study of the Effect of Depositional Angle on the Mechanical Characteristics of Coral Sand[J]. 2025, 42(2): 121-128.
邬文浩, 吴杨, 彭伟锋, 等. 沉积角对岛礁珊瑚砂力学特性影响的真三轴试验及本构模型研究[J]. 广东工业大学学报, 2025, 42(2): 121–128. DOI： 10.12052/gdutxb.250026

Wu Wenhao, Wu Yang, Peng Weifeng, et al. True Triaxial Shear Test and Constitutive Model Study of the Effect of Depositional Angle on the Mechanical Characteristics of Coral Sand[J]. 2025, 42(2): 121-128. DOI： 10.12052/gdutxb.250026.

摘要

珊瑚砂是岛礁工程中吹填地基的首选材料，是一种颗粒形状复杂、孔隙富集的颗粒材料。受重力沉积和颗粒特性影响，珊瑚砂吹填地基土的力学性质表现出明显各向异性。本文通过对取自南海岛礁的珊瑚砂开展真三轴排水剪切试验，研究中主应力系数和沉积角对其强度和变形特性的影响。试验结果表明：随着中主应力系数的增加，珊瑚砂的峰值强度显著提高，体变剪胀性减弱。另外，珊瑚砂的峰值强度会随着初始沉积角的增加而减小。基于边界面模型理论

构建了能够考虑各向异性的砂土本构模型。通过与真三轴试验结果的对比，验证了该模型的有效性。研究成果将为合理评估三维应力状态下南海岛礁地基承载性能提供理论参考。

Abstract

Coral sand is the preferred backfill material for reef foundation engineering due to its complex particle morphology and highly porous structure. The mechanical properties of coral sand deposits exhibit significant anisotropy resulting from gravitational sedimentation processes and inherent particle characteristics. This investigation conducted true triaxial drained shear tests on South China Sea coral sands to systematically evaluate the influence of intermediate principal stress coefficient and initial deposition angle on mechanical responses. Experimental findings reveal two critical trends: (1) Peak shear strength demonstrates marked enhancement with increasing intermediate principal stress coefficient

accompanied by reduced dilatancy effects; (2) Progressive attenuation of peak strength occurs with elevation of initial deposition angle. A novel three-dimensional anisotropic constitutive model was developed within the theoretical framework of bounding surface plasticity. Model validation through comparative analysis with true triaxial test data confirms its predictive capability. These research outcomes establish a theoretical basis for evaluating three-dimensional bearing capacity characteristics of coral sand foundations in South China Sea reef engineering applications.

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references

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