基于SPH的煤岩单轴加载声发射数值模拟

Numerical simulation of coal uniaxial loading acoustic emission based on SPH

基于SPH(光滑粒子流体动力学)数值计算方法,研究了非均质煤岩材料的单轴压缩试验声发射效应,揭示了煤岩的声发射效应随着均质度m的变化规律。研究表明:随着均质度m值的增大,试件的声发射效应由群震型逐渐变为前震—主震—余震型、主震型;试件积聚能量的能力逐渐增强,材料属性由理想弹塑性材料向极端脆性材料转变,破坏模式由塑性流动破坏逐渐变为脆性破坏,其破坏形式越来越剧烈。

The SPH（ Smoothed Particle Hydrodynamics） method was applied to study the acoustic emission effect in uniaxial compression test of coal with different homogeneous degree m. The change law of acoustic emission effect with the homogeneous degree was obtained. With the increasing of the homogeneous degree,the AE effect modes changes gradually from the swarm shocks to the pre-main-after shocks,and then to the main shocks. The ability of accumulation energy gradually increases with the homogeneous degree. The material properties of specimens changes from the ideal elastic-plastic material to the extreme brittle material. The mode of coal specimens＇ failure changes from the plastic flow failure to the brittle failure. The impact failure of specimens increases with the homogeneous degree.