类岩石材料声发射参数与应力和应变耦合本构关系

Coupling constitutive relations of AE parameter versus stress and strain for rock-like materials

利用液压伺服试验系统和声波监测仪开展了岩石和混凝土材料声发射特性试验研究,并在试验基础上研究了损伤变量与声发射参数之间的量化关系.结果表明,损伤变量与声发射参数呈线性关系.采用基于Weibull分布的损伤本构模型及损伤变量与声发射数间的经验公式,推导出应力、应变参量与声发射数参量的耦合模型,该模型参数可以根据应力--应变全曲线及损伤变量与声发射数关系曲线的几何边界条件确定其表达式,方式简单适用.通过与岩石和混凝土试样单轴压缩试验实测结果对比,证实模型可以很好地反映单轴受压状态下岩石和混凝土的应力、应变与声发射数的耦合关系.

Experiments on acoustic emission characteristics of rock and concrete samples were carried out with a servo-hydraulic test system and a smart acoustic monitoring device.Based on these experiments,the relationship between damage variable and acoustic emission（AE） parameter was investigated,and the results showed a linear correlation between them.By using the damage constitutive model based on Weibull distribution and the empirical relationship of damage variable versus acoustic emission number,the coupling models of acoustic emission parameter versus stress and strain were formulated.Parameters in the models can be determined according to the geometric boundary conditions of the full stress-strain curve and the curve of damage variable versus acoustic emission number.The process for acquiring these model parameters is simple and easy to use.A comparison between the results of the coupling models and the measured data by uniaxial compression testing for rock samples and concrete samples proves that the coupling models can better reflect the relations of acoustic emission parameter versus stress and strain.