Journal of South China University of Technology (Natural Science Edition) ›› 2020, Vol. 48 ›› Issue (4): 15-27.doi: 10.12141/j.issn.1000-565X.190454

• Architecture & Civil Engineering • Previous Articles     Next Articles

Side Friction of Large-Diameter Steel Cylinder Simulated Using 3D Discrete Element Method 

DING Xiaobin1,2 SHI Yu1 CHEN Junsheng1,2#br#   

  1. 1． School of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510640，Guangdong，China;2． State Key Laboratory of Subtropical Building Science，South China University of Technology，Guangzhou 510640，Guangdong，China
  • Received:2019-07-17 Revised:2019-11-21 Online:2020-04-25 Published:2020-04-01
  • Contact: 陈俊生(1979-)，博士，副教授，主要从事隧道与地下建筑结构研究。 E-mail:jschen@scut.edu.cn
  • About author:丁小彬(1984-)，博士，副教授，主要从事地下工程与结构研究。E-mail:dingxb@scut.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China (41702295)

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Abstract: The penetration process of the large-diameter steel cylinder in sandy soil was stimulated with a three-di-mensional particle flow code (PFC3D) based on the discrete element method (DEM)． A scaled model based on the principle of the centrifuge and a full-scale model with adjusting the micro-parameters were developed to analyze the sliding friction force distribution of the cylinder during installation and the contact force chain of soil particles．The DEM model was validated by comparing the simulated results with theoretical values and reported experimental phenomena． The effects of micro parameters of particles and contacts on side friction were studied through further parametric analysis． The study results show that，unlike pile penetration，there is almost no soil-plug effect during penetration process of large-diameter steel cylinder． Besides，the inside friction is half of the total friction，and the side friction has the effect of friction fatigue during installation． Compared with the scale model，the full-scale mo-del with adjustable micro-parameters has better calculation efficiency． There is a close relationship between the side friction and micro parameters．

Key words: discrete element method, numerical simulation, large-diameter steel cylinder, side friction

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