Study on Bearing Capacity Envelope Surface and Mooring Point of Composite Gravity Foundation on Sand

被引：0
|
作者：
Wang L. [1 ]
Yue Y. [1 ]
Zhang C. [2 ,3 ]
Li Y. [1 ]
Wang R. [1 ]
Tian Y. [4 ]
机构：
[1] State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin
[2] School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang
[3] Hebei Technological Innovation Center of Disaster Prevention and Mitigation Engineering of Geotechnical and Structural System, Shijiazhuang
[4] Department of Infrastructure Engineering, The University of Melbourne, 3010, VIC
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2023年 / 56卷 / 05期
基金：
中国国家自然科学基金;
关键词：
bearing capacity envelope surface; combined load; composite gravity foundation; mooring point; perforation; skirt;
D O I：
10.11784/tdxbz202208025
中图分类号：
学科分类号：
摘要：
Owing to its better stability and environmental adaptability, the gravity foundation is a reliable scheme for anchoring floating offshore platforms on sand in the seabed. According to the existing research, it is known that adding skirts can improve the gravity foundation’s anisotropic bearing capacity, and bottom perforations can reduce the hydrodynamic force exerted on the foundation. To improve the bearing capacity and service performance of the gravity foundation, a type of composite gravity foundation with skirts and bottom perforations is proposed in this paper, which can significantly reduce cost, reduce the hydrodynamic force, and facilitate penetration. Based on the method of finite element limit analysis, the coupling effect of skirts and perforations on the foundation’s vertical ultimate bearing capacity is studied at first, and it is found that skirts can improve the vertical ultimate bearing capacity while a high perforation ratio will reduce this capacity. In addition, the vertical ultimate bearing capacity is not affected in the case of a value within the critical perforation ratio. Then, a 3D bearing capacity envelope surface of the composite gravity foundation within the critical perforation ratio is obtained. Considering that the actual bearing capacity of the foundation is related to the mooring point position in practical applications, the optimal mooring point position can be found by using the 3D bearing capacity envelope surface of the foundation. Based on the actual wave and flow parameters, the external loads such as wave force are calculated, and a force model of the composite gravity foundation is built. The stress of the composite gravity foundation is converted to the load path in the 3D bearing capacity envelope surface, and the mooring force can be obtained by solving the equation of intersection between the load path and the bearing capacity envelope surface. From the comparison of mooring force obtained at different mooring points and mooring angles, it is found that the gravity foundation can provide a maximum mooring force for the mooring rope when it is anchored horizontally at the bottom. © 2023 Tianjin University. All rights reserved.
引用
收藏
页码：535 / 541
页数：6
相关论文
共 13 条
  • [1] Randolph M, Gourvenec S., Offshore Geotechnical Engineering[M], (2017)
  • [2] Chen Xuefeng, Li Yucheng, Sun Dapeng, Et al., An experimental study of wave acting on perforated caisson[J], China Offshore Platform, 16, 5, pp. 1-6, (2001)
  • [3] Hazell E., Bearing capacity of parallel strip footings on non-homogeneous clay[C], Proceedings of the 1st International Symposium on Frontiers in Offshore Geotechnics(ISFOG 2005), pp. 427-433, (2005)
  • [4] An investigation into the vertical bearing capacity of perforated mudmats[C], Proceedings of the 1st International Symposium on Frontiers in Offshore Geotechnics(ISFOG 2005), pp. 459-465, (2005)
  • [5] Kumar J，, Bhattacharya P., Bearing capacity of interfereing multiple strip footings by using lower bound finite elements limit analysis[J], Computers & Geotechnics, 37, 5, pp. 731-736, (2010)
  • [6] Hisham T E., Bearing capacity and settlement of skirted shallow foundations on sand[J], International Journal of Geomechanics, 13, 5, pp. 645-652, (2013)
  • [7] Fiumana N，, Bienen B，, Govoni L，, Et al., Combined loading capacity of skirted circular foundations in loose sand[J], Ocean Engineering, 183, pp. 57-72, (2019)
  • [8] Liu Jinlong, Chen Luwang, Wang Jili, Et al., Horizontal bearing capacity of suction anchor foundation in ocean engineering[J], Journal of Civil Engineering and Management, 33, 2, pp. 1-5, (2016)
  • [9] Liu Fushi, Research on Horizontal Load Characteristics of Gravity Anchor under the Condition of Calcareous Rock and Soil Site, (2018)
  • [10] Butterfield R，, Gottardi G., A complete three-dimensional failure envelope for shallow footings on sand[J], Géotechnique, 44, 1, pp. 181-184, (1994)
12