基于声发射概率密度函数固废胶结充填体损伤分析

固废胶结充填体是保障矿山安全回采的关键承载结构，为探究其实际承载损伤破坏过程，在RMT-150C岩石力学测试系统上对不同粗骨料含量的4组胶结充填体试样进行了单轴压缩与循环载荷下的声发射试验。结果表明：循环载荷下，4组试样均具有显著的Kaiser效应，且含块石的3组试样声发射事件数更丰富，峰值应力前达到了纯尾砂试样的152%、225%和300%。同时，利用声发射概率密度与承载应力水平间的关联性，得到了4组不同块石含量胶结充填体的声发射概率密度方程，通过声发射概率密度函数实现了声发射参数量化分析胶结充填体承载损伤过程。对比损伤变量-应力水平曲线可以看出，块石的加入能够有效减缓并抑制前期损伤，当块石含量为20%时，效果最好。

Damage Analysis of Solid Waste Rock Cemented Filling Body Based on Acoustic Emission Probability Density Function

Solid waste rock cemented filling body is the key load bearing structure of ensuring safety mining of mines，in order to investigate its actual load bearing damage and failure process，the acoustic emission tests of four groups of cemented filling specimens with different coarse aggregate contents were carried out under uniaxial compression and cyclic loading on the RMT-150C rock mechanics test system.Results showed that four groups of samples has significant Kaiser effect under cyclic loading，and the number of acoustic emission events of three groups of specimens containing block stones was more abundant，and 152%，225% and 300% of pure tailings were reached before the peak stress.At the same time，the acoustic emission probability density equations of four groups of cemented filling body with different block stone contents were obtained by using the correlation between acoustic emission probability density and stress level.Quantitative analysis of bearing damage process of cemented backfill by acoustic emission parameters was carried out by acoustic emission probability density fuction.It can be seen that the addition of ballast can effectively slow down and inhibit pre-injury by contrast damage variable-stress level curve，when the ballast content is 20%，the best results can be achieved.