人工胶结砂土力学特性的离散元模拟

›› 2011, Vol. 32 ›› Issue (6): 1849-1856.

人工胶结砂土力学特性的离散元模拟

蒋明镜^{1, 2}，孙渝刚^{1, 2}

1. 同济大学地下建筑与工程系，上海 2009；2. 同济大学岩土及地下工程教育部重点实验室，上海 200092

出版日期:2011-06-10 发布日期:2011-06-21
作者简介:蒋明镜，男，1965年生，博士，同济大学特聘教授，主要从事太空土、深海能源土、天然结构性黏土、砂土、非饱和土宏观微观试验、本构模型和数值分析研究以及土体渐进破坏分析
基金资助:
国家杰出青年科学基金资助（No. 51025932）；国家自然科学基金资助项目（No. 10972158）

A DEM modelling of mechanical behaviour of artificially cemented sand

JIANG Ming-jing^{1, 2}, SUN Yu-gang^{1, 2}

1. Deptartment of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical & Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, China

Online:2011-06-10 Published:2011-06-21

摘要/Abstract

摘要： 采用离散单元法（DEM）对胶结砂土力学特性进行模拟。将基于室内试验测得的理想胶结颗粒接触力学响应引入到开发的二维离散元程序（NS2D）中，模拟胶结砂土颗粒间的胶结作用。对不同胶结强度和围压的胶结砂土进行平面应变双轴压缩试验模拟，并将模拟结果与Wang和Leung[1]提供的人工胶结砂土的试验结果进行比较。最后对数值模拟中胶结试样的微观力学响应（接触力链、胶结点破坏率和位移场）进行分析。结果表明，离散元数值模拟能够有效地反映胶结砂土的主要力学特性，相比同一初始孔隙比的无胶结松散砂土，胶结砂土将具有更高的强度，应力-应变关系呈应变软化，体变为先剪缩后剪胀，且两者的差异随胶结强度的增大和围压的减小而越趋显著。此外，胶结砂土宏观力学响应（应力-应变关系和剪胀性）与其微观力学响应密切相关。

关键词: 胶结砂土, 理想胶结颗粒, 接触模型, 离散单元法

Abstract: This paper presents a numerical investigation of cemented sand behaviours using the distinct element method (DEM). First, the test results of the contact behaviours between the idealized bonded granules were introduced in two-dimensional DEM code (NS2D) to simulate the bonding effect between particles in cemented sand. Second, a series of biaxial compression tests on cemented sand of different bonding strengths and confining pressures were carried out by the DEM simulations. Then, the DEM results were compared with the test results on artificially cemented sand obtained by Wang and Leung[1]. Finally, the analysis of micromechanical responses (i.e. contact force chain, bond breakage ratio, and displacement field) in DEM specimens was presented in this paper. The simulation results show that the DEM model is able to capture the main mechanical behaviours of cemented sand, such as the strength enhancement, strain softening and volumetric dilation. The different features between cemented sand and uncemented sand become more pronounced with the increasing of bonding strength and deceasing of confining pressure. The macromechanical responses (i.e. stress-strain and volumetric-axial strain relationships) of cemented sand are associated with the micromechanical responses (i.e. contact force chain, bond breakage ratio, and displacement field)

Key words: cemented sand, idealized bonded granules, contact model, distinct element method

中图分类号:

TU443

蒋明镜，孙渝刚. 人工胶结砂土力学特性的离散元模拟[J]. , 2011, 32(6): 1849-1856.

JIANG Ming-jing , SUN Yu-gang. A DEM modelling of mechanical behaviour of artificially cemented sand[J]. , 2011, 32(6): 1849-1856.

参考文献

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