[1] Seyedeh Fateme Faraji, Wu Qixin, Zheng Junjie,. True triaxial behavior of sandy soils under both drained and undrained conditions: A discrete element perspective [J]. Journal of Southeast University (English Edition), 2024, 40 (4): 336-345. [doi:10.3969/j.issn.1003-7985.2024.04.002]

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True triaxial behavior of sandy soils under both drained and undrained conditions: A discrete element perspective()

排水和不排水条件下砂土真三轴力学行为离散元分析

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

40

Issue:

2024 4

Page:

336-345

Research Field:

Civil Engineering

Publishing date:

2024-12-03

Info

Title:

True triaxial behavior of sandy soils under both drained and undrained conditions: A discrete element perspective

排水和不排水条件下砂土真三轴力学行为离散元分析

Author(s):

Seyedeh Fateme Faraji¹;  Wu Qixin²;  Zheng Junjie¹

¹School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
²School of Civil Engineering, Wuhan University, Wuhan 430072, China

Seyedeh Fateme Faraji¹;  吴祁新²;  郑俊杰¹

¹华中科技大学土木与水利工程学院, 武汉 430074; ²武汉大学土木建筑工程学院, 武汉 430072

Keywords:

granular materials;  true triaxial test;  discrete element method;  fabric evolution

颗粒材料;  真三轴试验;  离散元方法;  组构演化

PACS:

TU431

DOI:

10.3969/j.issn.1003-7985.2024.04.002

Abstract:

An advanced discrete element servomechanism that can simultaneously and independently control the evolution equations of six stress and strain components without introducing severe stress concentration is implemented. Such a comprehensive series of discrete element method simulations of both drained and undrained behavior of transversely isotropic sandy soils are successfully conducted in the true triaxial setting. During the simulation process, the evolution patterns of the load-bearing structure of the granular specimen are tracked using a contact-normal-based fabric tensor. The simulation results show that sandy soils exhibit more significant non-coaxiality between the loading direction and the major principal direction of the fabric tensor under extension than under compression. Therefore, the fabric of the sandy soils under extension has a stronger tendency to evolve toward the loading direction than that under compression, causing a more significant disturbance to the load-bearing structure. Consequently, compared with the extension loading condition, the transversely isotropic specimen under compression exhibits a higher shear strength and stronger dilatancy under drained conditions and a stronger liquefaction resistance under undrained conditions.

提出了一种离散元伺服机制, 能够同时并独立地控制6个应力和应变分量的演化, 避免应力集中现象.在真三轴试验中, 对排水和不排水压缩剪切条件下横观各向同性砂土的力学响应进行离散元模拟.模拟过程中, 通过基于颗粒间接触法向的组构张量, 量化颗粒试件的承力结构演化规律.结果表明, 无论是在排水还是不排水压缩剪切条件下, 相较于压缩加载, 砂土试件在拉伸时的加载方向与组构主方向上均呈现出更为显著的非共轴性.试件在拉伸条件下表现出更强的向加载方向演化的趋势, 导致承力结构出现更大的扰动.相较于拉伸条件, 横观各向同性试件在排水压缩剪切条件下表现出更高的剪切强度和剪胀性, 在不排水压缩剪切条件下则表现出更高的抗液化强度.

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Memo

Memo:

Biographies: Seyedeh Fateme Faraji(1986—), female, Ph.D. candidate; Zheng Junjie(corresponding author), male, doctor, professor, zhengjj@hust.edu.cn.
Foundation items: The National Natural Science of China(No. 52208366), the Department of Science and Technology of Hubei Province(No. 2023AFB578).
Citation: Seyedeh Fateme Faraji, Wu Qixin, Zheng Junjie. True triaxial behavior of sandy soils under both drained and undrained conditions: A discrete element perspective[J].Journal of Southeast University(English Edition), 2024, 40(4):336-345.DOI:10.3969/j.issn.1003-7985.2024.04.002.

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