胶结颗粒料力学行为与声发射信号特征

王卫; 汪博浩; 赵运天; 潘坚文; 金峰

doi:10.16511/j.cnki.qhdxxb.2018.25.055

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清华大学学报（自然科学版） ›› 2019, Vol. 59 ›› Issue (5) : 337-344. DOI: 10.16511/j.cnki.qhdxxb.2018.25.055

水利水电工程

胶结颗粒料力学行为与声发射信号特征

王卫¹, 汪博浩¹, 赵运天², 潘坚文¹, 金峰¹

作者信息 +

Mechanical behavior and acoustic emission responsecharacteristics of cemented granular materials

WANG Wei¹, WANG Bohao¹, ZHAO Yuntian², PAN Jianwen¹, JIN Feng¹

Author information +

文章历史 +

摘要

胶结颗粒料是由胶结流体填充密实堆积颗粒体部分孔隙得到，硬化后的胶结流体限制颗粒的转动和移动，赋予颗粒材料整体性力学行为。该文基于自流可控灌浆技术制备胶结颗粒料试样，其中采用高强度的陶瓷球作为颗粒料骨架，胶结流体为自密实水泥净浆。通过单轴压缩试验研究了胶结基质含量对胶结颗粒料力学行为的影响，同时采用声发射量测系统对试样加载过程进行监测。研究结果表明：胶结颗粒料以脆性破坏为主，峰值前的应力应变曲线可分为压密阶段和线弹性段；峰值后，低胶结量的试样存在应变硬化现象和第二峰值，第二峰值强度远低于材料的峰值强度，随着胶结基质含量的提高，应变硬化现象逐渐消失。胶结颗粒料的峰值强度随胶结基质体积分数线性变化且拟合直线通过原点。压密阶段应变长度随着胶结基质体积分数的增加呈线性增大，而胶结基质体积分数对线弹性段应变长度无明显影响。当胶结颗粒料的胶结基质含量较低时，其声发射信号主要集中在峰值点附近；提高胶结基质含量，声发射信号产生时间前移至线弹性段；进一步增加胶结基质体积分数，声发射事件在压密阶段中期出现，并在线弹性段快速增强后维持在高水平。该研究成果有助于进一步理解胶结颗粒料的力学行为，同时对砂岩、砾岩、堆石混凝土和灌浆胶结砂土也具有重要参考价值。

Abstract

Cemented granular materials (CGM) are composed of densely packed particles bound together by a cement matrix that partially fills the interstitial pores which provides considerable stiffness to the material. This study investigated the mechanical behavior and acoustic emission (AE) response characteristics during uniaxial compression of an artificial cemented granular material made from high alumina ceramic beads combined with a self-compacting cement paste. The samples were fabricated using the rock-filled concrete technique without disturbing the granular backbone. The results show that the compressive strength is a linear function of the matrix volume fraction. Brittle fracture is the most significant mechanical behavior. Compaction in the linear-elastic regime is the dominant behavior in the pre-peak strength region with strain-softening accompanied by strain-hardening after the peak strength. The extent of the compaction phase linearly increases with the matrix volume fraction. However, the extent of the linear-elastic phase is independent of the matrix volume fraction. For the samples with little matrix material, an AE signal occurred when the material strength approached the peak value. The AE signals of samples with more matrix material mainly occurred in the initial stages of the elastic phase. The AE signals of samples with higher matrix volume fractions were found at the mid-term stage of the compaction phase and remained high until the samples failed. The results will help to further understand the mechanical behavior of cemented granular materials, and also provide an important reference for the studies of sandstone, conglomerate, rockfill concrete and grouted sands.

导出引用

王卫, 汪博浩, 赵运天, 潘坚文, 金峰. 胶结颗粒料力学行为与声发射信号特征[J]. 清华大学学报（自然科学版）. 2019, 59(5): 337-344 https://doi.org/10.16511/j.cnki.qhdxxb.2018.25.055

WANG Wei, WANG Bohao, ZHAO Yuntian, PAN Jianwen, JIN Feng. Mechanical behavior and acoustic emission responsecharacteristics of cemented granular materials[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(5): 337-344 https://doi.org/10.16511/j.cnki.qhdxxb.2018.25.055

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基金

国家重点研发计划项目（2018YFC0406800）；国家自然科学基金资助项目（51579133）

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收稿日期	出版日期
2018-10-31	2019-05-15
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2019-05-14

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