Research on the damage and seepage characteristics of unloading rock with high water pressure can help to further understand the mechanism of water inrush in deep mine floor and prevent water inrush. This paper used the RFPA2D-flow finite element software to study the failure and seepage characteristics of unloading rock with high water pressure and high stress and comparatively analyzed the failure modes and seepage characteristics of unloading rock with and without water pressure. The effects of different water pressure differences on the failure of unloading rock and the law of seepage were investigated by analyzing the change of acoustic emission and permeability coefficient with stress. The results showed that the unloading rock without water pressure was brittle failure, and the initial damage of the unloading model with water pressure was earlier than that of the model without water pressure and showed greater brittleness, and its cracks first break through at the bottom of the sample with higher osmotic pressure. With the increase in unloading, the permeability of rock increased gradually until it appeared an abrupt change. The failure mode and permeability law of the rock with different water pressure differences were basically the same, but the greater the pressure difference, the smaller the effective unloading capacity when the permeability coefficient changes suddenly, and the greater the possibility of water inrush in the rock.

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高水压卸荷岩的断裂与渗透特性研究

研究高水压卸荷岩的破坏与渗透特性，有助于进一步了解深部矿井底板突水的机理，防止突水。本文利用RFPA2D流动有限元软件对高水压高应力卸荷岩体的破坏与渗流特性进行了研究，比较了有水压与无水压卸荷岩体的破坏模式与渗流特征。通过分析声发射和渗透系数随应力的变化，研究了不同水压差对卸荷岩石破坏的影响及渗流规律。结果表明，无水压卸荷岩为脆性破坏，水压力下卸荷模型的初始破坏要早于无水压力下的模型，并显示出较大的脆性，并且其裂缝首先在渗透压较高的样品底部突破。随着卸荷量的增加，岩石的渗透率逐渐增加，直至出现突变。不同水压差的岩石的破坏模式和渗透率规律基本相同，但压差越大，渗透系数突然变化时的有效卸荷能力越小，岩石中涌水的可能性越大。 。随着卸荷量的增加，岩石的渗透率逐渐增加，直至出现突变。不同水压差的岩石的破坏模式和渗透率规律基本相同，但压差越大，渗透系数突然变化时的有效卸荷能力越小，岩石中涌水的可能性越大。 。随着卸荷量的增加，岩石的渗透率逐渐增加，直至出现突变。不同水压差的岩石的破坏模式和渗透率规律基本相同，但压差越大，渗透系数突然变化时的有效卸荷能力越小，岩石中涌水的可能性越大。 。