Volume 40 Issue 3
Jun.  2026
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2026  >  40(3): 430-435
LI Gaoshan, WANG Handong, HU Zhihao, LU Keyan, ZHENG Jie. Analysis of shear strength characteristics of saturated soft soil under self-weight preload consolidation load conditions[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(3): 430-435. doi: 10.20265/j.cnki.issn.1007-2993.2024-0587
Citation: LI Gaoshan, WANG Handong, HU Zhihao, LU Keyan, ZHENG Jie. Analysis of shear strength characteristics of saturated soft soil under self-weight preload consolidation load conditions[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(3): 430-435. doi: 10.20265/j.cnki.issn.1007-2993.2024-0587
shu

Analysis of shear strength characteristics of saturated soft soil under self-weight preload consolidation load conditions

doi: 10.20265/j.cnki.issn.1007-2993.2024-0587
  • 1.

    .Zhejiang Engineering Survey and Design Institute Group Co., Ltd., Ningbo 315012, Zhejiang, China

  • 2.

    Ningbo Regional Railway Investment and Development Co., Ltd., Ningbo 315012, Zhejiang, China

  • Received Date: 2024-12-16
  • Accepted Date: 2025-06-26
  • Rev Recd Date: 2025-04-19
    • Available Online: 2026-06-08
  • Publish Date: 2026-06-08
    Abstract
  • In the Ningbo coastal plain area, the thickness of shallow saturated soft soil is generally 30~40 meters, the self-weight stress of soil at different depths has certain differences. Using a unified standard consolidation preload in the indoor consolidated quick shear test would inevitably lead to a mismatch between the consolidation and the self-weight pressure, thus affecting the shear strength of the samples due to different degrees of consolidation. Focusing on the actual stress conditions of saturated soft soil, indoor comparison tests under standard method and self-weight preload were carried out in this research. The results show that compared to the standard method, the cohesion of saturated soil increased by 48% and the internal friction angle decreased by 13% after consolidation with self-weight preload. When the pre-consolidation load is less than its self-weight stress, the sample is not fully consolidated. The cementation between particles and the friction, interlocking and biting action are weakened, leading to a decrease in cohesion and internal friction angle. When the preloading consolidation load is greater than the self-weight stress of the soil, the drainage of pore water causes the sample to undergo greater consolidation, and the soil particles are rearranged. The cohesive force generated by the cementation effect is reduced, and the internal friction angle generated by the interlocking effect increased correspondingly. The shear strength characteristics of saturated soft soil under self-weight preload show an increase in cohesion and a decrease in the internal friction angle.

     

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