To investigate two-phase fluid flow processes influenced by phase interference, pressure drop, fracture roughness and environmental stress, a nitrogen-water two-phase flow experiment was carried out on highly rough granite fractures in an experimental triaxial cell. Pressure was used to control the two-phase fluid in the fracture. The results show that each fluid phase has a separate flow channel, even through rock fractures of large roughness. Correlation of the superficial velocities of the two-phase fluids identifies the annular flow at a high pressure drop due to the high kinetic energy of the gas phase; however, annular flow transitioned to complex flow with increasing fracture roughness and confining pressure. The relative permeability of water is greater than that of gas. The sum of the relative permeabilities of the two phases is less than unity due to phase interference. With increasing pressure head, confining pressure, and fracture roughness, the relative permeability of water shows a general decreasing trend and the sum of relative permeability continuously reduced, demonstrating that the localized flow paths of the different phases changed and the phase interference increased. The experimental relative permeability of gas is greater here than that determined by the nonlinear viscous coupling model and Corey model, but less than the straight-line relative permeability model (X-model). Among them, the viscous coupling model provides the closest approximation, indicating that the physical process of two-phase flow through highly rough and tight rock fractures is more like that through a pipe, rather than through porous media and parallel-plate channels.

为了研究受相干扰、压降、裂缝粗糙度和环境应力影响的两相流体流动过程，在实验三轴单元中对高粗糙度花岗岩裂缝进行了氮-水两相流动实验。压力被用来控制裂缝中的两相流体。结果表明，即使通过大粗糙度的岩石裂缝，每个流体相都有一个单独的流动通道。由于气相的高动能，两相流体的表观速度的相关性确定了高压降下的环形流动；但随着裂缝粗糙度和围压的增加，环状流向复杂流转变。水的相对渗透率大于气体的相对渗透率。由于相位干扰，两相的相对磁导率之和小于一。随着压头、围压和裂缝粗糙度的增加，水的相对渗透率总体呈下降趋势，相对渗透率之和不断减小，说明不同相的局部流道发生变化，相干扰增大。这里气体的实验相对渗透率大于非线性粘性耦合模型和Corey模型确定的，但小于直线相对渗透率模型（X模型）。其中，粘性耦合模型提供了最接近的近似值，表明两相流通过高度粗糙和致密的岩石裂缝的物理过程更像是通过管道，