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DOI: https://doi.org/10.11988/ckyyb.20250065

Model Tests on Compressive Bearing Properties of Thorn Piles in Sand

  • DU Peng 1, 2 ,
  • LIU Xiao-ling 2 ,
  • ZHOU De-quan 1 ,
  • LI Guang-fan 3
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  • 1. School of Civil and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China
  • 2. Yaha School of Design & Engineering, Haikou College of Economics, Haikou 571132, China
  • 3. School of Civil Engineering and Architecture, Hainan University, Haikou 570228, China

Received date: 2025-01-24

  Revised date: 2025-06-18

  Online published: 2025-09-01

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Abstract

In soft soil or karst areas, several problems exist, such as the poor properties of the pile end bearing layer or difficulties in entering the rock. Utilizing the idea of converting an end-bearing pile into a middle-bearing pile, a new type of discontinuous variable-section thorn pile is proposed. Through the self-developed loading device, indoor model tests with different thorn lengths and number of thorn layers were carried out to investigate the compressive bearing properties of thorn piles under sandy soil conditions. Tests show that the thorn piles have superior compressive and settlement resistance compared with the smooth piles. The existence of the thorn structure increases the embedded effect of the thorn soil and the effective stress of the soil around the pile, delays the softening of the pile side resistance, and expands the influence range of the soil around the pile. The influence of both thorn length and number of thorn layers on the bearing capacity of pile is positively correlated. Compared with thorn length, the number of thorn layers is more sensitive to the ultimate bearing capacity and pile side resistance. The most economical compressive bearing performance of the thorn piles is achieved when the thorn pitch is set to 1/8 of the pile length and the thorn length is one times the pile diameter. The concept of middle bearing degree is innovatively introduced to quantify the degree of middle bearing of pile thorns, and the engineering design method of thorn piles is proposed, which provides an effective method for the subsequent experimental and theoretical studies of thorn piles and other similar variable section piles.

Key words： pile foundation; thorn pile; compressive property; model test; number of thorn layers; thorn length

Cite this article

DU Peng , LIU Xiao-ling , ZHOU De-quan , LI Guang-fan . Model Tests on Compressive Bearing Properties of Thorn Piles in Sand[J]. Journal of Changjiang River Scientific Research Institute, 2025 . DOI: 10.11988/ckyyb.20250065

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