为了探究多重采动下破碎岩体压实与再破碎特征，本文开展了不同岩性散体力学试验，探究了循环荷载下散体力学参数变化规律，阐明了散体的能量演化特性与分形特征。研究结果表明：不同岩性试样中泥岩具有较低强度而最终应变量最高，造成试样输入相对较低的能量即可达到相同变形，从而对应不同岩性散体中泥岩的分形维数较大，相同荷载下泥岩散体的破碎程度较高。同时，应力加载初期，散体孔隙度衰减最快，压缩模量逐渐上升，散体此阶段迅速被压实，但存在一定阈值，当应力超过该范围后，散体能量密度变化量与孔隙度衰减量增加，压缩模量持续下降，散体颗粒大量破裂。研究结果可为揭示多重采动下垮落带岩体移动机制提供重要理论支撑。

Under the influence of multiple mining in the coal seam group, there are a large number of granules with different lithologies in the collapse zone, which have an important influence on the movement of the overlying rock strata. Therefore, in order to investigate the compaction and re-crushing characteristics of the granules under multiple mining, this research carries out the mechanical test of granules of different lithology. The variation rule of granules mechanical parameters under cyclic loading was investigated, and the energy evolution characteristics and fractal characteristics of granules were clarified. The results show that: the mudstone in different lithological samples has lower strength and the highest final strain, resulting in relatively low energy input to achieve the same deformation, which corresponds to the larger fractal dimension of the mudstone in the granules of different lithologies, and the degree of fragmentation of the mudstone granules is higher under the same loading. Meanwhile, in the early stage of stress loading, the granules porosity decayed the fastest, the compression modulus gradually increased, and the granules was compacted rapidly at this stage, but there was a certain threshold, when the stress exceeded the range, the granules energy density change and porosity decay increased, the compression modulus continued to decline, and the granules particles were ruptured in large quantities. The results of the study can provide important theoretical support for revealing the movement mechanism of the rock mass in the collapse zone under multiple mining activities.

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