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首页 > 过刊浏览>2023年第26卷第2期 >122-128. DOI:10.3969/j.issn.1007-9629.2023.02.002
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基于离散元的EMAS泡沫混凝土贯入力学性能研究
作者:
作者单位:

1.同济大学 道路与交通工程教育部重点实验室，上海 201804;2.中建丝路建设投资有限公司， 陕西 西安 710075;3.中国公路学会，北京 100011

作者简介:

朱兴一（1983—），女，浙江绍兴人，同济大学教授，博士生导师，博士.E-mail：zhuxingyi66@tongji.edu.cn

通讯作者:

石小培（1986—），女，北京人，中国公路学会副研究员，硕士.E-mail：310255050@qq.com

中图分类号:

TU528.2

基金项目:

国家自然科学基金资助项目（51922079，61911530160）；上海市教育发展基金会和上海市教委“曙光计划”（21SG24）；上海市“科技创新行动计划”国际科技合作项目（22210710700）


Penetration Mechanical Properties of EMAS Foam Concrete Based on Discrete Element Simulation
Author:
Affiliation:

1.Key Laboratory of Road and Traffic Engineering of Ministry of Education， Tongji University， Shanghai 201804， China;2.China State Construction Silkroad Construction Investment Group Co.， Ltd.， Xi’an 710075， China;3.China Highway & Transportation Society， Beijing 100011， China

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    摘要:

    通过贯入力学试验研究特性材料拦阻系统（EMAS）泡沫混凝土在破碎碾压过程中的力学性能，并分析了冻融作用对其压溃强度及吸能效果的影响.在初步建立泡沫混凝土离散元模型的基础上，提出“虚拟试验法”，以获得泡沫混凝土离散元模型的最佳参数组合.通过模拟抗压强度试验证明了模型仿真精度可达97.7%.在此模型的基础上，研究了混凝土子颗粒及孔隙颗粒的半径和力学参数对材料贯入力学性能的影响.所提出的EMAS泡沫混凝土材料离散元模型可为EMAS拦阻过程仿真提供更为精确的研究方法.

    Abstract:

    Penetration tests were conducted to study the mechanical properties of engineered materials arresting system（EMAS） foam concrete in crushing process. The effects of freeze-thaw cycles on its compressive strength and energy absorption were analyzed. A discrete element model of foam concrete was established， and the virtual test method was proposed to calibrate parameters of the model. The simulation results of compressive strength prove that the accuracy of the model can reach 97.7%. With this model， the influences of particle size and mechanical parameters on penetration mechanical properties of foam concrete were studied. The discrete element model of EMAS foam concrete proposed in this work provides a more accurate research method for EMAS arresting simulation.

    表 2 接触模型参数Table 2 Parameters of contact model
    表 1 EMAS泡沫混凝土的配合比Table 1 Mix proportion of EMAS foam concrete
    图1 泡沫混凝土试件Fig.1 Foam concrete specimens
    图2 EMAS泡沫混凝土典型压溃曲线Fig.2 Typical compression curve of EMAS foam concrete
    图3 Hertz-Mindlin with bonding和Hertz-Mindlin（noslip）接触模型Fig.3 Contact models of Hertz-Mindlin with bonding and Hertz-Mindlin（no slip）
    图4 泡沫混凝土试件离散元模型Fig.4 Discrete element model of foam concrete specimen
    图5 模拟贯入力学试验与实际贯入力学试验Fig.5 Simulated penetration test and actual penetration test
    图6 模拟抗压强度试验与实际抗压强度试验Fig.6 Simulated compressive test and actual compressive test
    图7 泡沫混凝土贯入过程仿真Fig.7 Penetration process simulation of foam concrete
    图8 冻融循环前后泡沫混凝土的实测压溃曲线Fig.8 Test compression curves of foam concretes before and after freeze-thaw cycles
    图9 不同混凝土子颗粒半径下试件的模拟压溃曲线Fig.9 Simulated compression curves of foam concretes with different concrete particle radius
    图10 不同孔隙颗粒半径下试件的模拟压溃曲线Fig.10 Simulated compression curves of foam concretes with different pore particle radius
    图11 接触强度变化对泡沫混凝土力学性能的影响Fig.11 Effect of micro-strength on mechanical property of foam concrete
    图12 接触刚度变化对泡沫混凝土力学性能的影响Fig.12 Effect of micro-stiffness on mechanical property of foam concrete
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朱兴一,张启帆,于越,石小培.基于离散元的EMAS泡沫混凝土贯入力学性能研究[J].建筑材料学报,2023,26(2):122-128

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  • 收稿日期:2021-12-30
  • 最后修改日期:2022-04-09
  • 在线发布日期: 2023-03-06
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