鱼雷锚贯入土体过程数值分析  

Numerical Analysis of Torpedo Anchor Penetration in Soil

作　　者：张金利[1] 郝佳伟[1] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116023

出　　处：《水利与建筑工程学报》2015年第4期33-39,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金资助项目(51179023)

摘　　要：鱼雷锚主要应用于采用紧绷式锚泊系统的浮动式采油平台中。采用LS-DYNA软件针对质量为40 t的鱼雷锚以一定冲击速度贯入海床土体的过程进行了数值分析。主要考虑鱼雷锚长径比(L/D)、冲击速度、海床土体的c、φ等参数变化对鱼雷锚贯入过程影响。计算结果表明,鱼雷锚贯入海床土体的过程为快速过程,总历时极短(秒级),贯入过程可分为加速与减速两个阶段,其中减速阶段历时较长。贯入阻力随贯入深度增加而增大至峰值,当速度接近零时,贯入阻力出现陡降,最终贯入阻力(静阻力)与鱼雷锚重力平衡。随着冲击速度增加,贯入深度相应增大,且两者具有较好的线性关系。当冲击速度不变时,贯入深度随L/D增加而增大。海床土体强度参数c、φ的变化对鱼雷锚的贯入过程具有重要影响,随强度参数增加,贯入深度相应减小。Torpedo anchors are mainly used in taut-leg mooring system of floating production facilities. In order to under- stand the influence of torpedo anchor length to diameter ratio, impact velocity and the strength parameters of seabed soil on the penetration of torpedo anchor, this paper used the finite element analysis software IS - DYNA to study the process of 40t torpedo anchor penetration in seabed soil at a certain velocity. The numerical results indicate that it is a very fast （usually within seconds） penetration process, which can be divided into two phases, namely the acceleration phase and the deceleration phase, with the latter lasting longer. The resistance force increases with the depth of penetration until it peaks, while suddenly drops when the velocity is close to zero, and finally reaches torpedo anchor＇ s gravity （ static resis- tance force）. The depth of penetration increases with impact velocity with good linear relation. When impact velocity is constant, the depth of penetration increases with the length to diameter ratio （L/D）. The strength parameters c and have great influence on the penetration process, the depth of penetration decreases with the increase of these strength pa- rameters.

关 键 词：鱼雷锚 长径比 冲击速度 贯入深度 强度参数 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]