鱼雷锚上拔承载力的物质点法数值分析  

Numerical analysis of torpedo anchor′s uplift bearing capacity by material point method

作　　者：程钰 邱长林[1] CHENG Yu;QIU Chang-lin(School of Civil Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《水道港口》2021年第1期114-122,共9页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(51322904)。

摘　　要：鱼雷锚是一种依靠自身重力贯入的新型深水锚固系泊基础,鱼雷锚承载力研究对海上工程设计施工至关重要。为了研究鱼雷锚的上拔承载力,应用物质点法模拟鱼雷锚在正常固结黏土中上拔过程现场原位试验,结果证实了该物质点法数模在评估鱼雷锚在黏土中的抗拔承载力的可靠性,并得到鱼雷锚上拔过程中土体地基变形规律和上拔承载力影响因素。分析结果表明,锚上拔过程地基土体竖向位移以向上为主,锚尾部附近地基土体变形大于锚侧附近地基土体;锚上拔显著塑性变形区为以锚尖初始埋深下5~6倍锚径位置的地基埋深为顶点、以地基表面12倍锚径为底边的等腰三角形。文章为鱼雷锚上拔承载力研究提供一种新的数值算法,为实际工程承载力估算提供参考。The torpedo anchor is a new type of deep-water anchoring mooring foundation that penetrates by its own gravity.The determination of its uplift bearing capacity is crucial to the design and construction of offshore engineering.In order to study its uplift bearing capacity,the material point method was used to simulate the in-situ test of the torpedo anchor uplift process in normal consolidated clay.The results verify the reliability of the material point method in simulating the uplift process of torpedo anchor and reveal the influence of some factors on pull-up bearing capacity.The results show that the vertical displacement of the soils during the uplifting of the anchor is mainly upward,and the deformation of the soils near the anchor tail is greater than that near the anchor sides.The area of significant plastic deformation during pullout is an isosceles triangle,whose apex is at the depth of 5-6 times the anchor diameter under the initial burial depth of the anchor tip and whose base is 12 times the anchor diameter at the surface of foundation.This study provides a new numerical algorithm for studying torpedo anchor pull-up bearing capacity and a reference for practical engineering design.

关 键 词：鱼雷锚 上拔承载力 物质点法 数值模拟 

分 类 号：U65[交通运输工程—港口、海岸及近海工程]