Modified lysmer’s analog model for two dimensional mat settlements under vertically uniform load

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.25.3.221
D. Chang, M. H. Hung, Sangseom Jeong
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引用次数: 1

Abstract

A two dimensional model of linearly elastic soil spring used for the settlement analysis of the flexible mat foundation is suggested in this study. The spring constants of the soils underneath the foundation were modeled assuming uniformly vertical load applied onto the foundation. The soil spring constants were back calculated using the three-dimensional finite element analysis with Midas GTS NX program. Variation of the soil spring constants was modeled as a two-dimensional polynomial function in terms of the normalized spatial distances between the center of foundation and the analytical points. The Lysmer's analog spring for soils underneath the rigid foundation was adopted and calibrated for the flexible foundation. For validations, the newly proposed soil spring model was incorporated into a two dimensional finite difference analysis for a square mat foundation at the surface of an elastic half-space consisting of soft clays. Comparative study was made for elastic soils where the shear wave velocity is 120~180 m/s and the Poisson's ratio varies at 0.3~0.5. The resulting foundation settlements from the two dimensional finite difference analysis with the proposed soil springs were found in good agreement with those obtained directly from three dimensional finite element analyses. Details of the applications and limitations of the modified Lysmer's analog springs were discussed in this study.
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修正lysmer垂直均布荷载作用下二维垫块沉降模拟模型
本文提出了一种用于柔性垫基沉降分析的二维线弹性土弹簧模型。在基础上施加均匀垂直荷载的情况下,建立了基础下土体的弹性常数模型。利用Midas GTS NX三维有限元软件反演土体弹性常数。土壤弹性常数的变化以归一化的基础中心与解析点之间的空间距离为二维多项式函数进行建模。采用刚性地基下的Lysmer模拟弹簧,并对柔性地基进行了标定。为了验证新提出的土壤弹簧模型,将其纳入软粘土弹性半空间表面方形垫基的二维有限差分分析中。对剪切波速为120~ 180m /s,泊松比为0.3~0.5的弹性土进行了对比研究。利用所提出的土弹簧进行二维有限差分分析所得的地基沉降与直接进行三维有限元分析所得的沉降结果吻合较好。本文详细讨论了改进的Lysmer模拟弹簧的应用和局限性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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