【摘要】 采空区垮落带破碎岩样的压实与破碎特征直接影响采空区渗流特征、工作面矿压显现、地表沉陷等。为了研究不同粒径破碎岩样的压实与破碎特征，结合声发射监测系统，开展了考虑粒径的破碎岩样压实试验。结果表明：颗粒粒径大的破碎岩样在相同加载应力下发生再破碎释放的能量和破碎次数更高，但在相同应变条件下对应的应力越小；在此基础上，构建了考虑颗粒粒径的破碎岩样加载应力-应变模型；破碎岩样在破碎阶段声发射累计计数与累计能量持续增加，粒径越大的颗粒产生更多的声发射事件；破碎岩样的再次破碎是以拉伸破坏为主，且随着应力的增加，剪切破坏比例持续减小，但颗粒粒径越大剪切破坏比例越高；声发射b值表明破碎岩样压实再破碎是一个裂隙稳定发育的过程；声发射定位实验表明颗粒破碎具有在垂直方向上分层破碎、水平方向上相对均匀破碎的特性；在水平方向上边界区域最先开始破碎并逐渐向中心区域均匀扩散，竖直方向上上部层位最先发生破碎，随后开始向中下部层位转移。研究结果对采空区上覆岩层及地表移动、矿压显现控制、采空区安全治理具有一定指导意义。更多还原

【Abstract】 The compaction and re-crushing characteristics of broken rock samples(BRS) in the goaf caving zone directly influence the seepage characteristics in the goaf, mining pressure on the longwall face, and surface subsidence. To study the compaction and re-crushing characteristics of BRS with different particle sizes, the experiment of BRS compaction considering particle size was carried out with the help of acoustic emission(AE) monitoring system. The experimental results indicate that BRS with larger particle sizes release more energy and have a higher number of re-crushing when subjected to the same loading stress. But the smaller the corresponding stress under the same strain conditions of the larger particle sizes. On the basis, a stress-strain model for BRS compaction considering particle size was developed. The cumulative count and energy of AE from BRS continue to increase during the broken stage. The larger the particle size, the more AE events occur. Re-crushing of BRS is mainly characterized by tensile failure. As stress increases, the proportion of shear failure continues to decrease. However, larger particle sizes show a higher proportion of shear failure. The b-value of AE indicates that the BRS undergoes a process of stable crack development during re-crushing. The acoustic emission localization experiment shows that the re-crushing of particles occurs as layered breakage in the vertical direction and uniform breakage in the horizontal direction. Horizontally, breakage starts in the boundary area and spreads evenly to the central area. Vertically, the upper layer breaks first, followed by the middle and lower layers. The research results have certain guiding significance for the overlying rock strata and surface movement, control of mining pressure manifestation, and safety management of goaf.更多还原