Three-dimensional Discrete-continuum Coupling Numerical Simulation of Bearing Mechanism on Geogrid-encased Stone Columns

被引：0
|
作者：
Tan X. [1 ,2 ]
Yin X. [1 ]
Hu Z. [1 ]
Qiu Z. [1 ]
Chen C. [1 ,2 ]
机构：
[1] College of Civil Engineering, Hunan Unversity, Changsha
[2] Key Laboratory of Buldng Safety and Energy Effieieney of Minstry of Education, Hunan Unversity, Changsha
来源：
Tiedao Xuebao/Journal of the China Railway Society | 2023年 / 45卷 / 04期
关键词：
dscrete element method; failure; geogrid; model test; stone column;
D O I：
10.3969/j.issn.1001-8360.2023.04.016
中图分类号：
学科分类号：
摘要：
Geogrid encased stone columns show extremely complex behaviors related to the nteraction in the gravel-geo-grid-soil system. A numerical modeling method was proposed to simuate geognd-encased stone columns based on the three-dmensional dscrete-continuum coupling calcuation scheme. The stone column was mod eled using the dscrete element method considering the real geometry of gravel particles, followed by the simulation of the baxial tensile geogrid using the elastic membrane structure element. The numerical model was verified by comp aring the load-settlement curves and deformation characteristics of the encased stone columns obtained from model tests. The complete load-bearing, deformation and failure process of encased stone columns with dfferent encasing lengths was simulated, and the nteraction of the gravel-geogrid-soil system was dscussed from a mesoscopc view to expain the bearing mechansm and failure characteristics of geogrid-encased stone columns. The proposed dscrete-continuum couping numerical model not ony o-vercomes the dfficulty of the continuum numerical model in accurately reflecting mesoscopc nteractions between the gravels and the geogrid, but also has advantages over the dscrete element numerical model in terms of parameter calibration and computational efficiency, whch provides an effective numerical method to study the bearing and deformation aw of the composite ground reinforced by geogrid encased stone columns. © 2023 Science Press. All rights reserved.
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页码：139 / 147
页数：8
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