›› 2018, Vol. 39 ›› Issue (6): 2089-2098.doi: 10.16285/j.rsm.2016.2865

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Vacuum penetration and ultimate pull-out capacity of low skirted suction caissons

LIU Xiao-ke1, 2, LU Qun1, 3, 4, LU Shi-wei1, LIU Chun-long1, GUO Shao-long1   

  1. 1. School of Civil Engineering, Tianjin Chengjian University, Tianjin 300384, China; 2. North China Municipal Engineering Design and Research Institute Co., Ltd., Tianjin 300381, China; 3. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin Chengjian University, Tianjin 300384, China; 4. PowerChina Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 310014)
  • Received:2017-02-15 Online:2018-06-11 Published:2018-07-03
  • Supported by:

    This work was supported by the Tianjin Application Foundation and Frontier Technology Research Plan (15JCYBJC48900) and the Science and Technology Project of PowerChina (SD2013-10).

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Abstract: A new model of the low skirted suction caisson was proposed to improve its bearing capacity and make it easy to penetrate and protect the soil around the barrel from the ocean current. Penetrating the caisson with a double barrel of vacuum pressure can not only improve the penetration but also effectively reduce the height of soil plug. A new method of ultra-low underneath vacuum preloading was put forward to consolidate soft soil and shorten the period quickly. The soil reinforced by this method can better simulate the foundation soil with increased strength along the depth. The suction caisson models with different specifications by the vacuum method were penetrated into soil, and then the feasibility of the low skirted suction caisson was comparatively studied. The penetration resistance was analysed, and then a corresponding formula was deduced by fitting experimental data. The bearing capacity of the suction caisson was studied by the 45°pullout test combined with the finite element analysis of PLAXIS 3D software. Finally, the rationality of the low skirted suction caisson was verified.

Key words: low skirted suction caisson, underneath vacuum preloading, penetration resistance, soil plug effect, bearing capacity

CLC Number: 

  • TU 473.1

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