Gangue backfilling mining (GBM) can effectively alleviate the gangue accumulation pollution and the overburden aquifer destruction. To efficiently evaluate the reutilization of gangue wastes by GBM and its advantage in overburden aquifer protection, non-Darcy hydraulic properties and deformation behaviors of granular gangues were studied through laboratorial, theoretical, and in-situ aspects. A series of compression and seepage tests on granular gangues under the variable original grain size grade (GSG) and stress rate were conducted. Laboratorial testing results convince that, hydraulic properties (porosity and permeability) of the granular gangue decline with the increasing original GSG and decreasing stress rate. The crushing ratio of the sample increases with the increase of original GSG and the decrease of stress rate. The fractal dimension reveals more obvious increases in the samples with the higher original GSGs and lower stress rates. The Kruger model (a classical theoretical model) was employed to predict the permeability evolution based on the porosity. However, the invalid pores in rocks would result in the model’s underestimation. To this end, an improved model was established to predict the permeability evolution by the fractal dimension, and the improved Kruger model has better accuracy than the original one. Finally, according to the laboratorial testing and theoretical predicted results, friendly-environmental strategies for overburden aquifer protection were proposed. The effectiveness of these strategies was successfully verified by an in-situ application. It is concluded that the high filling stress, low gangue original GSG, and low filling stress rate in GBM can effectively reduce the risk of overburden aquifer destruction.

煤ue石回填开采可以有效减轻煤can石堆积污染和上覆含水层的破坏。为了有效评估GBM产生的脉石废物的再利用及其在覆盖层含水层保护方面的优势，通过实验室，理论和现场研究了粒状脉石的非达西水力特性和变形行为。在可变的原始粒度等级（GSG）和应力速率下，对颗粒脉石进行了一系列的压缩和渗透测试。实验室测试结果表明，颗粒煤石的水力特性（孔隙度和渗透性）随原始GSG的增加和应力率的降低而下降。样品的破碎率随原始GSG的增加和应力率的降低而增加。分形维数表明，样品的原始GSG值较高且应力率较低，则样品的增加更为明显。使用克鲁格模型（经典理论模型）基于孔隙率预测渗透率演化。但是，岩石中无效的孔隙会导致模型的低估。为此，建立了一种通过分形维数预测渗透率演化的改进模型，并且改进后的克鲁格模型具有比原始模型更好的准确性。最后，根据实验室测试和理论预测结果，提出了保护覆盖层的友好环境策略。这些策略的有效性已通过现场应用成功验证。结论是高填充应力，低脉石原始GSG，