Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (5): 100-106.doi: 10.6040/j.issn.1672-3961.0.2020.443

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Horizontal bearing capacity of suction bucket foundation under wave dynamic load

Haotian LUO(),Ke WU*(),Yameng LI,Jiaxiang XU,Zhihao XING   

  1. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2020-11-02 Online:2021-10-20 Published:2021-09-29
  • Contact: Ke WU E-mail:luohaotian@mail.sdu.edu.cn;wuke@sdu.edu.cn

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Abstract:

For the horizontal ultimate bearing capacity of the suction bucket foundation under horizontal dynamic loads such as waves and wind, the explicit dynamic method was adopted to establish the mechanical model of the suction bucket foundation under the wave dynamic load. Based on the infinite boundary and Rayleigh damping, the model optimization analysis was carried out, and the comparative study of the ultimate bearing performance of the foundation under static load and dynamic load (action time 0.5, 1, 2, 5 s) under the same horizontal displacement conditions was carried out. The research results showed that the horizontal ultimate bearing capacity curve of the bucket foundation under different dynamic load time decreased with the increase of the loading time compared with the static load, and gradually approached the static load bearing capacity curve. Affected by the damping of the rock and soil media on the seabed, the rotation center of the barrel under the horizontal load moved up to the top of the barrel as the time of the dynamic load decreased.

Key words: bucket foundation, dynamic load, horizontal bearing capacity, numerical calculation, loading time

CLC Number: 

  • TU470.3

Fig.1

Soil and bucket model"

Fig.2

Figure of infinite unit vertex coding"

Fig.3

Soil network model with infinite boundaries"

Fig.4

Rayleigh damping curve"

Table 1

Dynamic characteristics of bucket"

振型 频率/Hz 圆频率ω 振动描述
1 8.264 51.895 桶顶上下振动
2 26.827 168.474 桶壁水平振动
3 26.830 168.492 桶壁水平振动
4 48.311 303.393 桶壁对边振动
5 51.873 325.762 桶壁对边振动
6 57.040 358.211 桶壁三边振动
7 58.514 367.468 桶壁三边振动
8 67.786 425.696 桶壁扭转
9 76.435 480.012 桶壁四边振动
10 76.921 483.064 桶壁四边振动

Table 2

Dynamic characteristics of foundation"

振型 频率/Hz 圆频率ω 振动描述
1、2、3、4、5、6 0 0 土体与无限边界旋转
7、8 0.142 0.894 桶内土体水平振动
9 0.289 1.818 无限边界上下振动
10、11 0.300 1.889 土体底部对边振动
12 0.308 1.932 土体底边四边振动
13 0.308 1.933 土体底部上下振动
14 0.313 1.966 土体底部四边振动
15、16 0.320 2.009 土体顶部对边振动
17 0.326 2.050 土体底部中心上下振动

Fig.5

Horizontal bearing capacity-displacement curve"

Fig.6

Changes in earth pressure"

Fig.7

Displacement vector diagram"

Fig.8

Changes in the center of rotation at different times"

Fig.9

Time-dynamic level ultimate bearing capacity coefficient diagram"

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