正态分布矸石侧限压缩特征与声发射特征研究

Study on Confined Compression Characteristics and Acoustic Emission Characteristics of Gangue with Normal Distribution

为研究矸石集料的承载力学特征及声发射特征规律,通过采用岩石力学伺服加载系统和声发射系统对矸石集料进行侧限压缩试验和声发射信息采集,考虑采空区破碎矸石粒径分布特征和受力状态,以平均级配矸石集料为对比,研究正态分布矸石集料在不同轴向应力加载过程中的应力应变关系、声发射能量、粒径级配和分形维数的变化。结果表明:矸石集料应力应变曲线呈指数函数关系,正态分布矸石集料在承载过程中产生的应变更大;较平均级配,正态分布矸石集料先发生大范围破碎现象,且频率更高,分布更均匀,但其最高声发射能量小于平均级配;分形维数与加载应力呈对数函数关系,正态分布矸石集料分形维数增长率高于平均级配,具有更大的跨度区间。

In order to study the bearing capacity and acoustic emission characteristics of gangue aggregate,a hydraulic servo rock mechanics test system was used to conduct a confining compression test,with an acoustic emission system to collect acoustic emission information of crushed gangue aggregate.Considering the particle size distribution characteristics and stress state of broken gangue in caving zone,the stress-strain relationship,acoustic emission energy,particle size gradation and fractal dimension of gangue aggregate processes were analyzed with comparison between normal distribution and average grading under different axial stress loadings.The results show that the stress-strain curve of gangue aggregate is an exponential function relationship,but the normal distribution gangue aggregate changes significantly during the compaction process.Compared with the average gradation,the normal distribution gangue aggregate first occurs large-scale crushing phenomenon,and the frequency is higher,the distribution is more uniform,but the highest acoustic emission energy is less than the average gradation.The relationship between fractal dimension and loading stress is logarithmic function.The growth rate of fractal dimension of normal distribution gangue aggregate is higher than that of average gradation,and has a larger span interval.