吸力贯入式板锚转动上拔过程的数值模拟研究

王腾; 严梦

doi:10.11779/CJGE201601012

吸力贯入式板锚转动上拔过程的数值模拟研究 English Version

王腾,
严梦

中国石油大学(华东)船舶与海洋工程系,山东青岛 266580

基金项目: 国家自然科学基金项目（51179201）; 中央高校基本科研业务费专项资金项目（15CX05040A）

详细信息

作者简介:
王腾(1973- ),男,山东海阳人,博士,教授,主要从事海洋岩土工程方面研究。

计量
- 文章访问数: 471
- HTML全文浏览量: 5
- PDF下载量: 301
出版历程
- 收稿日期: 2015-01-04
- 发布日期: 2016-01-19

Numerical study on keying of suction embedded plate anchors

WANG Teng,
YAN Meng

Department of Offshore Engineering, China University of Petroleum, Qingdao 266580, China

摘要

摘要: 吸力贯入式板锚（SEPLA）是一种系泊深海浮式结构的新型基础,在转动上拔的过程中其埋深和承载力会不断减小。采用包络面塑性极限分析方法,对吸力贯入式板锚在其转动上拔的过程中的埋深损失和承载力进行了模拟分析,并考虑锚链、土和板锚的相互作用。研究了切向偏心、锚链泥线夹角等参数对埋深损失、板锚转角、承载力的影响,并与离心机模型试验数据验证。研究结果表明,随着锚眼切向偏心的增大,板锚埋深损失逐渐减小,甚至出现埋深增大的现象,但相应的承载力显著降低。当偏心比e_p/e_n<0.1时,板锚的承载力基本不变;当e_p/e_n>0.1后,板锚的承载力随e_p/e_n增大而减小。泥线处锚链倾角越小时,板锚的转动角度越小,获得的承载力效果越好。
- 板锚 /
- 转动 /
- 锚链 /
- 塑性方法 /
- 数值分析
Abstract: The suction embedded plate anchor (SEPLA) is a new foundation to moor floating structures in deep water. Loss of embedment during keying has a significant effect on the design capacity. The envelope analysis method of plastic limit is adopted to simulate and analyze the embedment loss and the capacity of the keying process of SEPLAs, taking into account of the interactions of anchor chain, soil and plate anchor. The effects of varying padeye offsets and mudline angle of anchor chain on the embedment loss, inclination and capacity of the plate anchor are studied, and they are verified by the data of centrifuge experiments. The results from simulations show that the embedment loss of SEPLA decreases with the increase of padeye location offset towards the bottom of the anchor. The capacity of the plate anchor keeps stable when the eccentricity ratio of e_p/e_n is less than 0.1. When e_p/e_n is greater than 0.1, the bearing capacity of plate anchor significantly decreases. Besides, a better result of the bearing capacity can be yielded under the condition of a smaller mudline angle of the anchor chain with a smaller rotation angle.
- plate anchor /
- keying /
- anchor chain /
- plasticity approach /
- numerical analysis

HTML全文

参考文献(19)

[1]	叶邦全. 海洋工程用锚类型及其发展综述[J]. 船舶与海洋工程, 2012, 3: 1-7. (YE Bang-quan. Review of anchor types and development in marine engineering[J]. Naval Architecture and Ocean Engineering, 2012, 3: 1-7. (in Chinese))
[2]	SONG Zhen-he. Pullout behavior of suction embedded plate anchors in clay[D]. Perth: Curtin University of Technology, 2008.
[3]	DOVE P, TREU H, WILDE B. Suction embedded plate anchor (SEPLA): a new anchoring solution for ultra-deep water mooring [C]// Proceedings of the Deep Offshore Technology Conference. New Orleans, 1998.
[4]	WANG D, HU Y, RANDOLPF M F. Three-dimensional large deformation finite-element analysis of plate anchors in uniform clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010, 136(2): 355-365.
[5]	WANG D, HU Y, RANDOLPF M F. Keying of rectangular plate anchors in normally consolidated clays[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2011, 137(12): 1244-1253.
[6]	TIAN Y, CASSIDY M J, RANDOLF M F, et al. A simple implementation of RITSS and its application in large deformation analysis[J]. Computers and Geotechnics, 2014, 56: 160-167.
[7]	TIAN Y, GAUDIN C, CASSIDY M J. Improving plate anchor design with a keying flap[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2014, 140(5): 04014009.
[8]	LOWMASS A C. Installation and keying of follower embedded plate anchor[D]. Perth: University of Western Australia, 2006.
[9]	AUBENY C P, MURFF J D, Kim B M. Prediction of anchor trajectory during drag embedment in soft clay[J]. International Journal of Offshore and Polar Engineering, 2008, 18(4): 314-319.
[10]	AUBENY C P, CHI C. Mechanics of drag embedment anchors in a soft seabed[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010, 136(1): 57-68.
[11]	CASSIDY M J, GAUDIN C, RANDOLPH M F, et al. A plasticity model to assess the keying of plate anchors[J]. Géotechnique, 2012, 62(9): 825-836.
[12]	YANG M, AUBENY C P, MUEFF J D. Behavior of suction embedded plate anchors during keying process[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2011, 138(2): 174-183.
[13]	SONG Z, HU Y, O'LOUGHLIN C, et al. Loss in anchor embedment during plate anchor keying in clay[J]. Journal of Geotechnical and Geoenvironmental Gngineering, 2009, 135(10): 1475-1485.
[14]	TIAN Y, CASSIDY M J, GAUDIN C. The influence of padeye offset on plate anchor re-embedding behaviour[J]. Géotechnique Letters, 2014, 4(1-3): 39-44.
[15]	NEUBECKER S R, RANDOLPH M F. Profile and frictional capacity of embedded anchor chains[J]. Journal of Geotechnical Engineering, 1995, 121(11): 797-803.
[16]	O'NEILL M P, BRANSBY M F, RANDOLPF M F. Drag anchor fluke soil interaction in clays[J]. Canadian Geotechnical Journal, 2003, 40(1): 78-94.
[17]	BRANSBY M F, O'NEILL M P. Drag anchor fluke-soil interaction in clays[C]// Proceeding of the International Symposium on Numerical Models in Geomechanics (NUMOG VII). Graz, 1999: 489-494.
[18]	ELKHATIB S, RANDOLPF M F. The effect of interface friction on the performance of drag-in plate anchors[C]// Proceeding of the 5th International Symposium on Frontiers in Offshore Geotechnics. Perth, 2005.
[19]	ELKHATIB S. The behaviour of drag-in plate anchors in soft cohesive soils[D]. Perth: University of Western Australia, 2006.