利用自主研发的上保护层开采物理相似模拟实验台,进行了不同间距上保护层开采下被保护层渗流变化规律的实验研究。实验结果表明:保护层开采后,重复采动保护层层数越多,被保护层卸压效果越明显;渗透性变化在走向方向先后经历升高、到达峰值后降低、趋于稳定、再升高、到达峰值后再降低的过程,变化曲线呈现马鞍状。 Based on the self-developed physical similarity simulation test bench for the upper protective layer, experimental study on the variation of the seepage of the protective layer under the protective layer mining at different intervals was carried out. The experimental results show that after the protective layer is mined, the more protective layers are repeatedly mined, the more the pressure relief by the protective layer is more obvious. The permeability changes successively experienced the increase in the direction of arrival, peaked and then decreased, stabilized and then increased High, reaching the peak and then lower the process, showing a saddle-like curve.