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为了更进一步研究陷落柱的突水机理,完善陷落柱突水的试验基础,通过自制的一套变质量破碎岩体渗流试验系统,对变质量破碎岩体非Darcy流渗透特性进行试验,并对破碎泥岩在渗流过程中质量流失量、孔隙度、渗透率、非Darcy流β因子及加速度系数的时变规律进行了研究。研究表明:泥岩试样在渗流过程中渗流形式发生了巨大的变化。在渗流开始时,流失质量迅速增加,引起试样内部孔隙结构变化,孔隙度增加,试样的渗透性能增强,试样压得越密实,质量流失量越多,孔隙度变化越快,渗透性能越强。质量流失量与渗透性是相互影响的,由于试验中质量流失具有时变性特征,渗透性能也具有时变性。最后,陷落柱突水过程可以描述为,在其底部承压水压力作用下,大量细小颗粒随水流一起迁移流失,引起柱体内孔隙度变大,渗透性加强,导致渗流剧变,引发突水。
In order to further study the water inrush mechanism of collapse columns and improve the experimental foundation of water inrush from collapsed columns, a set of self-made seepage test system of variable mass crushed rock mass is used to test the non-Darcy flow infiltration characteristics of variable mass rock mass. The time-varying law of mass loss, porosity, permeability, non-Darcy flow β factor and acceleration coefficient of fractured mudstone in seepage process are studied. The results show that the seepage flow patterns of mudstone samples have undergone tremendous changes. At the beginning of seepage flow, the loss mass rapidly increases, causing the change of pore structure inside the sample. The porosity increases, the permeability of the sample increases, and the sample compresses more densely. The more mass loss, the faster the change of porosity, the higher the permeability The stronger. Mass loss and permeability affect each other. Due to the time-varying characteristics of mass loss in the experiment, permeability also has time-varying characteristics. Finally, the water inrush process can be described as a large number of small particles migrating along with the water flow under the pressure of the bottom under pressure, causing the porosity of the column to become larger and the permeability to increase. As a result, the seepage drastically changes and water inrush occurs.