波浪动荷载作用下吸力式桶形基础水平承载性能

doi:10.6040/j.issn.1672-3961.0.2020.443

摘要/Abstract

摘要：

针对波浪、风等水平动荷载作用下吸力式桶形基础的水平极限承载能力，采用显式动力方法，建立波浪动荷载作用下吸力式桶形基础的力学模型，基于无限边界与瑞利阻尼进行模型优化分析，开展相同水平位移条件下静荷载、动荷载(作用时间0.5、1、2、5 s)模式下地基极限承载性能对比研究。研究结果表明，与静荷载作用相比，不同动荷载作用时间下桶形基础的水平极限承载能力变化曲线随着加载时间的增大而降低，逐渐趋近于静荷载承载力曲线；受到海床岩土介质阻尼影响，桶体在水平荷载作用下的旋转中心随着动荷载作用时间的减少而向桶体顶部上移。

关键词: 桶形基础, 动荷载, 水平承载力, 数值计算, 加载时间

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

中图分类号:

TU470.3

罗浩天,武科,厉雅萌,徐嘉祥,邢志豪. 波浪动荷载作用下吸力式桶形基础水平承载性能[J]. 山东大学学报 (工学版), 2021, 51(5): 100-106.

Haotian LUO,Ke WU,Yameng LI,Jiaxiang XU,Zhihao XING. Horizontal bearing capacity of suction bucket foundation under wave dynamic load[J]. Journal of Shandong University(Engineering Science), 2021, 51(5): 100-106.

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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

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

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