基于显式积分方法的主应力轴旋转本构模型海床有限元应用

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英文篇名：The Application of a Constitutive Model concerning Principal Stress Rotation in Seabed Finite Element Analysis Using Explicit Integration Method 作者：王喆 ; 李利平 英文作者：WANG Zhe;LI Liping;Faculty of Engineering,Lishui University; 关键词：主应力轴旋转 ; 波浪荷载 ; 砂土液化 ; 有限元分析 ; 数值积分 英文关键词：principal stress rotation;;wave loadings;;sand liquefaction;;finite element method;;numerical integration 中文刊名：LSZX 英文刊名：Journal of Lishui University 机构：丽水学院工学院; 出版日期：2019-03-10 出版单位：丽水学院学报 年：2019 期：v.41;No.223 基金：浙江省自然科学基金青年基金资助项目“构造改变效应-主应力轴旋转耦合本构模型开发及其波浪-海床有限元应用”(LQ19E090003) 语种：中文; 页：LSZX201902003 页数：8 CN：02 ISSN：33-1333/Z 分类号：24-31

摘要

主应力轴旋转是砂土响应的重要特点,尤其是在波浪等循环荷载下,它可能引起超静孔隙水压力和塑性应变的累积,进而导致严重的砂土液化及结构位移。然而考虑主应力轴旋转的岩土工程边值问题有限元研究目前仍较少。因此,选取考虑主应力轴旋转的PSR模型以及适宜的数值积分方法,将其应用至波浪作用下的海床有限元分析中,以对海床中的主应力轴旋转效应及其引发的超静孔隙水压力累积、砂土液化等现象展开研究。
        Cyclic loadings, for example, wave loadings, can generate considerable principal stress rotation(PSR) in sand. Continuous PSR may cause the accumulation of excess pore water pressures and plastic strains, thus leading to sand liquefactions and displacements of the structure. However, there are few finite element investigations on geotechnical boundary value problems concerning the PSR. Therefore, this paper adopts an explicit integration method and applies a PSR model in the finite element analysis of seabed under wave loadings to investigate the sand behaviors in the seabed induced by the PSR, such as the build-up of excess pore water pressures, liquefactions, etc.

引文

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