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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3092-3108.DOI: 10.16552/j.cnki.issn1001-1625.2026.0252

• 水泥混凝土 • 上一篇    下一篇

不同冻融次数下堆石混凝土骨胶界面剪切破坏声发射特征研究

张天祺1(), 王安海1, 周泽阳2, 罗滔3(), 李黎3, 张琪4,5   

  1. 1.西京学院陕西省混凝土结构安全与耐久性重点实验室,西安 710123
    2.中国电建集团西北勘测设计研究院有限公司,西安 710065
    3.西北农林科技大学水利与建筑工程学院,咸阳 712100
    4.中交第一公路勘察设计研究院有限公司,西安 710065
    5.极端环境绿色长寿道路工程全国重点实验室,西安 710065
  • 收稿日期:2026-03-19 修订日期:2026-04-06 出版日期:2026-09-15 发布日期:2026-10-09
  • 通信作者: 罗 滔,博士,副教授。E-mail: luotao19870426@126.com
  • 作者简介:张天祺(1990—),男,博士,副教授。主要从事寒区堆石混凝土冻融损伤机理的研究。E-mail: kasonxt2022@163.com
  • 基金资助:
    陕西省自然科学基础研究计划项目(2024JC-YBQN-0284);国家自然科学基金项目(42501169);陕西省秦创原人才项目(QCYRCXM-2023-185);陕西省“校招共用”人才支持项目;陕西省教育厅政企联合资助项目(25JE020)

Acoustic Emission Characteristics of Shear Failure of Rock-Filled Concrete Aggregate-Paste Interface under Various Freeze-Thaw Cycles

ZHANG Tianqi1(), WANG Anhai1, ZHOU Zeyang2, LUO Tao3(), LI Li3, ZHANG Qi4,5   

  1. 1.Shaanxi Key Laboratory of Safety and Durability of Concrete Structures,Xijing University,Xi’an 710123,China
    2.Power China Northwest Engineering Corporation Limited,Xi’an 710065,China
    3.College of Water Resources and Architectural Engineering,Northwest A&F University,Xianyang 712100,China
    4.CCCC First Highway Consultants Co. ,Ltd,Xi’an 710065,China
    5.State Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment,Xi’an 710065,China
  • Received:2026-03-19 Revised:2026-04-06 Published:2026-09-15 Online:2026-10-09

摘要:

在寒区高频冻融环境下,堆石混凝土(RFC)中的堆石与自密实混凝土形成的大尺度界面(骨胶界面)更易遭受冻融破坏,这种破坏直接影响RFC工程的长期性能。基于声发射技术监测了不同冻融次数下骨胶界面的剪切破坏过程,分析了界面剪切强度的劣化规律,明确了不同阶段的剪切破坏模式,并构建了基于声发射参数的界面损伤模型。结果表明:随着冻融次数增加,由于界面间滑动摩擦与静摩擦交替作用,抗剪强度-剪切位移曲线在次峰之后出现上下波动振荡现象,且该现象所对应的剪切位移不断增大;骨胶界面峰值抗剪强度、次峰抗剪强度、残余抗剪强度降低至0.72、0.19、0.13 MPa,降幅分别为66.04%、81.55%、86.32%;基于累计振铃计数,可将剪切破坏过程划分为四个阶段,随着冻融次数增加,阶段Ⅰ、Ⅱ、Ⅲ的剪切裂纹占比降低,而阶段Ⅳ的剪切裂纹占比从66.9%增加到78.7%。冻融作用下,骨胶界面的主导破坏模式为剪切破坏,且基于声发射能量构建的损伤模型可较好地描述界面损伤演化过程。研究结果可为寒区堆石混凝土工程长期服役性能评估提供理论参考。

关键词: 堆石混凝土, 骨-胶界面, 冻融循环, 抗剪性能, 声发射, 损伤模型

Abstract:

Under high-frequency freeze-thaw environment in cold regions, the large-scale interface (aggregate-paste interface) formed between rockfill and self-compacting concrete in rock-filled concrete (RFC) is more susceptible to freeze-thaw damage, and this damage directly affects the long-term performance of RFC structures. In this paper, the shear failure process of the aggregate-paste interface under different freeze-thaw cycles was monitored based on acoustic emission technology, the degradation law of interfacial shear strength was analyzed, the shear failure modes at different stages were clarified, and an interfacial damage model based on acoustic emission parameters was constructed. The results show that with the increase of freeze-thaw cycles, due to the alternating effect of sliding friction and static friction at the interface, the shear strength-shear displacement curve exhibits an up-and-down oscillation phenomenon after the secondary peak, and the shear displacement at which this phenomenon occurs is continuously increased; the peak shear strength, secondary peak shear strength, and residual shear strength of the aggregate-paste interface decrease to 0.72, 0.19, and 0.13 MPa, with reductions of 66.04%, 81.55%, and 86.32%, respectively; based on the cumulative ringing count, the shear failure process can be divided into four stages. With the increase of freeze-thaw cycles, the proportion of shear cracks in stages Ⅰ, Ⅱ, and Ⅲ decreases, while the proportion of shear cracks in stage Ⅳ increases from 66.9% to 78.7%. Under freeze-thaw action, the dominant failure mode of the aggregate-paste interface is shear failure, and the damage model constructed based on acoustic emission energy can well describe the interfacial damage evolution process. The research results can provide a theoretical reference for the long-term service performance evaluation of rock-filled concrete projects in cold regions.

Key words: rock-filled concrete, aggregate-paste interface, freeze-thaw cycle, shear performance, acoustic emission, damage model

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