真三轴应力状态下岛礁珊瑚砂力学特性研究

doi:10.3724/1000-6915.jrme.2025.0236

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摘要掌握土体在三维应力状态下的强度特性对评估地基在复杂应力条件下的稳定性至关重要。针对岛礁珊瑚砂开展了不同中主应力系数条件下的真三轴排水剪切试验，探究中主应力对珊瑚砂应力–应变关系、峰值大主应变、峰值摩擦角以及剪胀关系的影响规律，分析不同强度准则对描述珊瑚砂真三轴强度变化规律的适用性。研究结果表明：真三轴应力状态下，珊瑚砂的应力–应变关系曲线均表现为应变软化型，峰值强度伴随中主应力系数的增加而显著提高，试样破坏时对应的峰值大主应变表现出先逐渐减小后增大的变化趋势。同时，随着中主应力系数的增加，中主应力方向的变形从膨胀过渡到压缩状态。另外，提升中主应力系数会显著增强珊瑚砂的峰值剪胀率。对比发现，Lade-Duncan和Matsuoka-Nakai强度准则对描述珊瑚砂三维强度特性有较好的适用性。

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	刘武杰1
	温丽维1
	黄锦盛2
	吴杨1
	刘东滢1
	崔杰1
	吕海波3
	曾召田4

关键词 ：土力学, 珊瑚砂, 真三轴试验, 中主应力系数, 变形, 强度准则

Abstract：Grasping the strength characteristics of soils under three-dimensional stress states is crucial for assessing the stability of foundations under complex stress conditions. In this paper, true triaxial shear tests under different intermediate principal stress coefficients were carried out on coral sand to investigate the influence laws of intermediate principal stress on the stress-strain relationship, peak-state large principal strain, peak-state friction angle, and stress-dilation relationship of coral sand. The applicability of different strength criteria in describing the variation in the true triaxial shear strength of coral sand is also examined. The results show that under the true triaxial shearing conditions, the stress-strain curves of coral sands are categorized into strain-softening type. The peak-state shear strength of the coral sand increases significantly with the increase of the intermediate principal stress coefficient. At the same time, the deformation in the direction of the intermediate principal stress transitions from expansion to compression behavior with the increase of the intermediate principal stress coefficient. In addition, the peak-state dilation rate of coral sand significantly increases with intermediate principal stress coefficient. By comparison, it is noted that the Lade-Duncan and Matsuoka-Nakai strength criterion describes the three-dimensional strength properties of coral sand with better applicability.

Key words： soil mechanics coral sand true triaxial test intermediate principal stress coefficient deformation strength criterion

引用本文:

刘武杰1，温丽维1，黄锦盛2，吴杨1，刘东滢1，崔杰1，吕海波3，曾召田4. 真三轴应力状态下岛礁珊瑚砂力学特性研究[J]. 岩石力学与工程学报, 2025, 44(10): 2814-2824.
LIU Wujie1, WEN Liwei1, HUANG Jinsheng2, WU Yang1, LIU Dongying1, CUI Jie1, LYU Haibo3, ZENG Zhaotian4. Mechanical characteristics of coral sand under true triaxial stress state. , 2025, 44(10): 2814-2824.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2025.0236 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I10/2814

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