单轴加载下充填体声发射特征研究  

Study on Acoustic Emission Properties of Filling Body under Uniaxial Loading

作　　者：李杨 孙光华[1,2] 叶洪涛 刘志义[1,2] 徐晓冬 

机构地区：[1]华北理工大学矿业工程学院,河北唐山市063210 [2]河北省矿业开发与安全技术重点实验室,河北唐山市063000

出　　处：《矿业研究与开发》2018年第3期109-112,共4页Mining Research and Development

基　　金：河北省自然科学基金项目(E2016209224);华北理工大学研究生创新项目(2017S19)

摘　　要：为探究采场充填体在单轴加载条件下,声发射信号与充填体裂纹细宏观动态信息的关联性,开展全尾砂胶结充填体的声发射力学特性试验。研究表明:充填体加载破坏过程可细分为5个阶段,各阶段声发射特性曲线的动态起伏变化与充填体裂纹的时空演化基本契合。声发射特性曲线呈"单峰"型,曲线峰值出现主导充填体全面破坏的"X"型主裂纹,结构面剪切滑移破坏,振铃计数频发,能量"井喷式"释放。破坏末段,小破坏事件偶发、间隔期延长,声发射事件保有活力。该研究结果为充填体失稳及前兆破坏研究提供了一定理论依据。In order to study the correlation between AE signal and micro-macro dynamic information of fractures of the stope fill- ing body under uniaxial loading conditions, an experimental research on AE mechanical properties of cemented railings backfill was carried out. The test results showed that the deformation process of filling body under loading could be divided into five stages, and the dynamic changes of AE curves at each stage could coincide with the spatial-temporal evolution of fractures. The curve of AE properties was unimodal, and at the peak of the curve, the main crack with X shape appeared, which mainly caused the failure of the filling body. The structural plane appeared shear slip, AE counts took place frequently, and the energy was releasing substantially. At the end of rupture, minor damages occurred occasionally with a longer interval, and AE activi- ties were still alive. This study provided a significant reference for the research of instability and damage forewarning of filling body.

关 键 词：单轴压缩变形 充填体 声发射特征 主裂纹 

分 类 号：TD853.34[矿业工程—金属矿开采]