计算力学学报2025，Vol.42Issue(6)：951-958,8.DOI:10.7511/jslx20240914001
船舶应急抛锚沉贯过程动力大变形数值模拟研究
Dynamic LDFE simulation on the depth of emergency penetration of ship anchors
摘要
Abstract
There exist pipelines,tunnels and optical cables in the seabed.If a ship needs to drop anchors in such areas in an emergency situation,the potential effect of the anchor's penetration on the safety of the subsea structures must be considered.Large deformation finite element simulations are conducted to investigate the penetration depth of ship anchors and the depth of disturbed soil during anchor dropping in sand.The effects of penetration velocity,anchor weight,and relative density of sand on the penetration depth and disturbed soil depth are studied.In the large deformation simulations,a Mohr-Coulomb model with strain softening was adopted to reflect the strain softening and dilatancy characteristics of medium-dense and dense sands.The numerical results indicate that the penetration depths of 17.8-t and 42-t anchors in sand are both less than 2.0 m.Based on the numerical results,empirical formulae are established to relate the anchor penetration depth,the total energy(kinetic and potential energy)of the anchor and the sand parameters.Based on the force analysis of anchors in sand and Newton's second law,the differential equation of motion for the dynamic penetration of a Hall anchor in sand is derived,enabling the prediction of the anchor's penetration depth-velocity curve.关键词
霍尔锚/抛锚深度/砂土/抛锚速度Key words
Hall anchor/anchor penetration depth/sand/impact velocity分类
海洋科学引用本文复制引用
LIU Fuhai,LI Zhixuan,YI Ping..船舶应急抛锚沉贯过程动力大变形数值模拟研究[J].计算力学学报,2025,42(6):951-958,8.基金项目
国家自然科学基金(51890915)资助项目. （51890915）
