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<p>This study primarily investigated the deformation characteristics of saturated sand subjected to repeated loading and unloading of spherical stress. A series of one-way and two-way cyclic drained triaxial tests were performed under the constant deviatoric stress path. The volumetric strain and shear strain under the two stress paths were compared, when the consolidation deviatoric stress were 300&#xa0;kPa, 600&#xa0;kPa, and 900&#xa0;kPa respectively. The test results revealed that there were obvious differences. The volumetric strain increased with increasing spherical stress, and decreased with its reduction, exhibiting an approximately linear relationship. In addition, the accumulative volumetric strain under one-way cyclic tests was less than that under two-way cyclic tests, which were 60%, 20%, and 100% for consolidation deviatoric stress of 300&#xa0;kPa, 600&#xa0;kPa, and 900&#xa0;kPa, respectively. Under the low consolidation deviatoric stress, the shear strain curves under different stress paths basically coincided. However, when the consolidation deviatoric stress was high, the influence of stress path was relatively obvious. At this time, the soil approached critical state line, and it was difficult to maintain the stress state. For the same consolidation deviatoric stress, the accumulative shear strain curves under two stress paths basically coincided. The smaller the consolidation deviatoric stress was, the fewer the number of cycles required for the accumulative shear strain to reach a stable value. The conclusion drawn could provide useful insights for describing the deformation development of the soil during the process of water level fluctuation, and had practical implications for related geotechnical engineering problem.</p>

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Deformation Characteristics of Saturated Sand Under One-Way and Two-Way Cyclic Spherical Stress

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Zhiyi Zhao,
  • Yanli Dong,
  • Zhaopeng Zhang,
  • Qinqin Guo,
  • Chuanxin Du

摘要

This study primarily investigated the deformation characteristics of saturated sand subjected to repeated loading and unloading of spherical stress. A series of one-way and two-way cyclic drained triaxial tests were performed under the constant deviatoric stress path. The volumetric strain and shear strain under the two stress paths were compared, when the consolidation deviatoric stress were 300 kPa, 600 kPa, and 900 kPa respectively. The test results revealed that there were obvious differences. The volumetric strain increased with increasing spherical stress, and decreased with its reduction, exhibiting an approximately linear relationship. In addition, the accumulative volumetric strain under one-way cyclic tests was less than that under two-way cyclic tests, which were 60%, 20%, and 100% for consolidation deviatoric stress of 300 kPa, 600 kPa, and 900 kPa, respectively. Under the low consolidation deviatoric stress, the shear strain curves under different stress paths basically coincided. However, when the consolidation deviatoric stress was high, the influence of stress path was relatively obvious. At this time, the soil approached critical state line, and it was difficult to maintain the stress state. For the same consolidation deviatoric stress, the accumulative shear strain curves under two stress paths basically coincided. The smaller the consolidation deviatoric stress was, the fewer the number of cycles required for the accumulative shear strain to reach a stable value. The conclusion drawn could provide useful insights for describing the deformation development of the soil during the process of water level fluctuation, and had practical implications for related geotechnical engineering problem.