The hysteresis of water-sediment mixture seepage in rock fractures is one of the critical factors which affect the determination of the timing of coal mine water inrush disasters prevention and control. In this paper, a mechanical model was established to study the hysteresis whose criteria were also put forward. The area of the hysteresis loop and the maximum pressure gradient were selected as characterization parameters of hysteresis. On this basis, an experimental system was established to study influences of different sand particle size, sand mass concentration, and fracture opening on water-sediment mixture seepage in rock fractures. The results indicated that the increase in the sand particle size and sand mass concentration could effectively enhance hysteresis characteristics of specimen fractures. While hysteresis characteristics decreased significantly with the increase of fracture opening. The research results are useful to prevent and control water inrush disasters of coal mine.

中文翻译：

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岩石裂缝中水沙混合气滞回特性的试验研究

岩石裂缝中水沙混合物渗流的滞后现象是影响确定煤矿突水灾害时机的关键因素之一。本文建立了一个力学模型来研究磁滞现象，并提出了标准。选择磁滞回线的面积和最大压力梯度作为磁滞的表征参数。在此基础上，建立了一个实验系统，研究不同粒径，砂质浓度和裂缝开度对岩石裂缝中水沙混合渗流的影响。结果表明，增加砂粒尺寸和砂质浓度可以有效地提高试样断裂的滞后特性。磁滞特性随着裂缝开度的增加而显着降低。研究结果对预防和控制煤矿的突水灾害具有重要意义。