三峡库区砂岩单轴压缩破坏声发射特征研究  

ACOUSTIC EMISSION CHARACTERISTICS OF SANDSTONE UNDER UNIAXIAL COMPRESSION FAILURE IN THE THREE-GORGES-RESERVOIR AREA

作　　者：张进兴 ZHANG Jinxing(College of Civil Engineering,Chongqing Three Gorges University,Chongqing 404020,China)

机构地区：[1]重庆三峡学院土木工程学院,重庆404020

出　　处：《低温建筑技术》2025年第3期6-9,共4页Low Temperature Architecture Technology

基　　金：重庆市三峡水库岸坡与工程结构灾变防控工程技术研究中心开放基金资助项目(SXAPGC23YB09);重庆三峡学院研究生科研创新项目(YJSKY24052)。

摘　　要：为揭示岩体破裂机制与声发射能量释放、事件频次等参数的动态关联。研究基于单轴压缩试验,通过实时监测加载过程中砂岩样本的声发射信号演变规律,对三峡库区砂岩破坏过程的声发射特征展开系统分析。研究表明砂岩破坏历经裂纹萌生、扩展至最终破坏的连续阶段,各阶段伴有独特声发射信号变化。微裂纹压密阶段,声发射事件增多但能量低,能量集中度r值缓升;稳定裂纹扩展阶段,振铃计数与能量同步增长,r值稳定;不稳定裂纹扩展阶段,峰值应力附近振铃计数波动大,r值先升后降。起裂应力处,能量对裂纹萌生最敏感;损伤应力时,RA/AF曲线前兆点提前且能放大微破裂信号。这些研究结果证明,声发射技术在砂岩破坏监测中的有效性,不仅为砂岩力学行为的研究提供了新手段,也为工程实践中砂岩材料的性能评估和破坏预警提供了重要依据。The study reveals the dynamic correlation between rock fracture mechanisms and acoustic emission(AE)parameters such as energy release and event frequency.Based on uniaxial compression tests,real-time monitoring of AE signal evolution during the loading process was conducted to systematically analyze the AE characteristics of sandstone failure in the Three Gorges Reservoir area.The results indicate that sandstone failure undergoes a continuous process from crack initiation and propagation to ultimate failure,with distinct AE signal variations at each stage.During the compaction phase of microcracks,AE events increase but with low energy,and the r-value rises gradually.In the stable crack propagation phase,both ring count and energy increase synchronously,and the r-value remains stable.In the unstable crack propagation phase,near peak stress,ring count fluctuates significantly,with the r-value first increasing and then decreasing.At the crack initiation stress,AE energy is most sensitive to crack formation.At the damage stress level,the RA/AF curve shows precursor points in advance,effectively amplifying micro-fracture signals.These findings demonstrate the effectiveness of AE technology in monitoring sandstone failure,providing not only a new approach for studying the mechanical behavior of sandstone but also a crucial basis for performance assessment and failure warning of sandstone materials in engineering applications.

关 键 词：三峡库区砂岩 声发射特征 单轴压缩 岩石破裂预警 

分 类 号：TU311[建筑科学—结构工程]