块石胶结充填体中块石含量是决定承载能力的关键因素，在 RMT-150C 材料试验机上进行不同块石含量的尾砂胶结充填体单轴压缩实验，利用1 MHz 的宽频声发射传感器采集峰值破坏前各阶段声发射参量，试验结果显示了块石对充填体不同承载阶段应力—应变水平的影响。对比应力—应变—累计声发射事件数关系，发现块石的掺入有利于降低充填体裂纹产生与扩展的速率从而使其承载能力得到加强。分析试验数据得到用累计声发射事件数表征充填体损伤程度的关系式，并得到2组试件的损伤—应变水平关系曲线。分析表明，块石的加入有效抑制充填体前期的损伤增长速率，并使得损伤激增段出现后延趋势。%The content of the ballast in the cemented filling body is the key factor to determine the bearing capacity.Acoustic emission experiments are conducted to monitor cemented filling body under uniaxial compression used by RMT-150C material testing machine.Acoustic emission parameters of each stage before peak value of stress-strain can be harvested with 1 MHz acoustic emission sensor.The experimental results show that the effect of the ballast on the changing law of the filling body in different loading stages.Contrast stress-strain-cumulative number of AE events relationship curve,the addition of the block stone is beneficial to reduce the rate of crack generation and expansion of the filling body,and bearing capacity is strengthened.The relation of cemented backfilling’s damage degree described by the number of cumulative AE events and damage-level stress curve are obtained based on the test results.Analysis shows,ballast has a good inhibitory effect on the damage of cemented tailings backfill in the early stage of load bearing and the surge of damage occurred deferred.
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