基于颗粒流的杂填土地基互嵌过程细观研究

张福海; 黄振清; 宋永平; 陈宇

doi:10.3724/j.gyjzG22112816

基于颗粒流的杂填土地基互嵌过程细观研究

doi: 10.3724/j.gyjzG22112816

岩土力学与堤坝工程教育部重点实验室(河海大学), 江苏省岩土工程技术工程研究中心, 南京 210098

基金项目:

国家自然科学基金项目(51778211)

江苏省自然科学基金项目(BK20171434)。

详细信息

作者简介:
张福海,博士,教授,主要从事软土地基处理工作。电子信箱:fhzhang@hhu.edu.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2022-11-28
- 网络出版日期: 2025-04-02

Mesoscopic Study on Mutual-Embedded Settlement of Miscellaneous Fill Foundation Based on Particle Flows

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering (Hohai University), Engineering Research Center of Jiangsu Geotechnical Engineering Technology, Nanjing 210098, China

摘要

摘要: 基于颗粒流理论,运用EDEM计算软件对杂填土和软土互嵌沉降过程进行数值模拟。在10,30,50 mm三种杂填土颗粒粒径情况下,通过分析互嵌过程中软土颗粒的速度场、位移场以及应力场,研究杂填土粒径对互嵌的影响。结果表明:当杂填土颗粒粒径较大时,软土颗粒的速度分布不均匀,杂填土孔隙通道内软土颗粒速度较大。随着杂填土颗粒粒径的减小,软土速度分布逐渐均匀,孔隙通道内的软土受到向上的挤压力也随之降低,导致互嵌沉降减小。杂填土和软土颗粒互嵌沉降主要受到软土表面土层的影响。从力学角度分析得到互嵌产生的原因是互嵌中接触力方向不断变化,逐渐发展形成拱形力链,而拱形力链上方的颗粒因力链较弱且受周围颗粒错动的影响而向上运动。
- 杂填土 /
- 互嵌沉降 /
- 土粒粒径 /
- 数值模拟 /
- 离散元
Abstract: Based on the particle flow theory, the numerical simulation of inter-embedded settlement of miscellaneous fills and soft soil was conducted by using the EDEM calculation software. In the case of 10 mm, 30 mm, and 50 mm particle sizes of miscellaneous fills, the influence of particle sizes of miscellaneous fills on mutual-embedding was studied by analyzing the velocity field, displacement field and stress field of soft soil particles during the mutual-embedding process. The research results indicated that when the particle size of the miscellaneous fill was large, the velocity distribution of the soft soil particles was not uniform, and the velocity of the soft soil particles in the pore channels of the miscellaneous fill was relatively large. As the particle size of the miscellaneous fill decreased, the velocity distribution of the soft soil gradually became uniform, and the upward pressing force on the soft soil in the pore channel also decreased, resulting in a decrease in the mutual-embedded settlement. The mutual-embedded settlement of miscellaneous fills and soft soil particles was mainly affected by the soil layer on the soft soil surface. From a mechanical perspective, the reason for the mutual-embedding was that the direction of the contact force in the mutual-embedding was constantly changing, and the arch force chain was gradually developed, and the particles above the arch force chain were weak due to the weak force chain and the influence of the surrounding particles upward movement.
- miscellaneous fill /
- mutual-embedded settlement /
- particle size /
- numerical simulation /
- discrete element

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参考文献(13)

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