基于声发射检测CSG材料损伤演变及裂纹识别
作者:
作者单位:

华北水利水电大学 水利学院,河南 郑州 450046

作者简介:

黄 虎(1981—), 男, 河南兰考人, 华北水利水电大学副教授, 硕士生导师,博士. E-mail:huanghu1006@163.com

通讯作者:

黄 虎(1981—), 男, 河南兰考人, 华北水利水电大学副教授, 硕士生导师,博士. E-mail:huanghu1006@163.com

中图分类号:

TV43

基金项目:

国家自然科学基金资助项目(52109154); 河南省科技攻关项目(192102310224)


Damage Evolution and Crack Identification of CSG Material Based on Acoustic Emission Detection Technology
Author:
Affiliation:

School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China

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    摘要:

    为了从细观角度揭示胶凝砂砾石(CSG)材料损伤演变机制和裂纹的分类演化规律,结合声发射测试技术,采用Geiger时差定位法、上升角-平均频率法和高斯混合模型,对CSG材料的裂纹类型进行识别.结果表明:CSG材料的破坏过程可分为原始裂纹闭合、新生裂纹扩展、裂纹聚结和峰后破坏4个阶段;声发射事件的三维定位直观反映了裂纹萌生、扩展直至贯通的动态演化过程;通过裂纹类型识别,加载前期试件以剪切裂纹为主,后期拉伸裂纹占比增加,在临近破坏前,高水胶比时剪切裂纹与拉伸裂纹比约为2∶1,低水胶比时约为1∶1.

    Abstract:

    To reveal the damage evolution mechanism and crack classification evolution law of cemented sand and gravel (CSG) materials from a microscopic perspective, the Geiger time difference positioning method, rising angle-average frequency method, and Gaussian mixture model were employed to identify the crack types of CSG materials. The results show that the failure process of CSG materials can be divided into four stages, initial crack closure, new crack propagation, crack coalescence and peak failure. The three-dimensional positioning of acoustic emission events intuitively reflects the dynamic evolution process from crack initiation, propagation to penetration. Through crack type identification, shear cracks predominate in the early loading stage, and the proportion of tensile cracks increases later. Before failure, the ratio of shear to tensile crack is about 2∶1 at high water-binder ratio, and about 1∶1 at low water-binder ratio.

    表 1 试件的配合比Table 1 Mix proportions of specimens
    图1 原状砂砾石的级配曲线Fig.1 Grading curve of undisturbed sand gravel
    图2 CSG材料的应力-应变曲线Fig.2 Stress-strain curves of CSG materials
    图3 试件AG1应力和声发特征参数随时间的变化曲线Fig.3 Curves of stress and AE characteristic parameters of specimen AG1
    图4 不同配合比下的声发射能量和振铃计数累计值Fig.4 Cumulative values of AE energy and counts under different mix proportions
    图5 试件AG1裂纹时空演化分布Fig.5 Distribution of spatio-temporal evolution of cracks in specimen AG1
    图6 裂纹类型示意图Fig.6 Schematic diagram of crack types
    图7 不同阶段下试件AG1的GMM分析结果Fig.7 Results of GMM analysis for specimen AG1 under different stages
    图8 CSG材料中的裂纹占比Fig.8 Crack percentage of CSG materials
    图9 不同裂纹类型的时空演化过程Fig.9 Spatio-temporal evolution process of different crack types
    图10 胶结砂砾石在单轴压缩下的破坏机理Fig.10 Failure mechanism of cemented sand gravel under uniaxial compression
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引用本文

黄虎,刘赵涵,邱庆明,曹克磊,郭利霞.基于声发射检测CSG材料损伤演变及裂纹识别[J].建筑材料学报,2024,27(6):565-572

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  • 收稿日期:2023-07-12
  • 最后修改日期:2023-11-09
  • 在线发布日期: 2024-07-11
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