纳米混凝土声发射特性分析及其力学参数与声发射参数关系的研究

Analyses of acoustic emission characteristics of Nano-concrete and the relationship between mechanical parameters and acoustic emission parameters

本文对不同二氧化硅掺量的纳米混凝土进行单轴压缩声发射试验。试验结果表明:当二氧化硅掺入量不超过3%时,纳米混凝土的声发射活性随着二氧化硅掺入量的增加而明显增强。从时间角度出发,在以时间参数作为中间变量的基础上推导出声发射能量累计数与应变的耦合关系。利用基于weibull分布的混凝土损伤本构模型,进一步推导出声发射累计数与应力以及损伤之间的耦合关系。结果表明理论曲线和试验数据结果吻合程度较好。

This article is based on a different SiO2 content of Nano-concrete under uniaxial compression of Acoustic Emission （AE） testing. Test results show that when SiO2 content is less than 3%, AE activity of nano concrete enhances with the increase of SiO2 content. Starting from the time domain, the coupling relation between AE cumulative energy and strain is derived, which is based on the time parameter as an intermediate variable. Further, the coupling relation between AE cumulative energy and stress and damage is deduced, which is based on distribution of the Weibull concrete damage constitutive model. Results indicated that theory curves and test dates matched well.