Mechanical characteristics of coral sand under true triaxial stress state
LIU Wujie1, WEN Liwei1, HUANG Jinsheng2, WU Yang1, LIU Dongying1, CUI Jie1, LYU Haibo3, ZENG Zhaotian4
(1. School of Civil and Traffic Engineering, Guangzhou University, Guangzhou, Guangdong 510006, China; 2. Dongguan Institute of Building Research Co., Ltd, Dongguan, Guangdong 523809, China; 3. School of Architecture and Electrical Engineering, Hezhou University, Hezhou, Guangxi 542899, China; 4. School of Civil Engineering, Guilin Technology of University,
Guilin, Guangxi 5896372, China)
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.
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2025, Vol. 44 
