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定量描述交叉裂隙的渗流特性是明确整个裂隙网络渗流特性的基础。制作三维人工交叉裂隙模型,建立高精度渗流测试系统;求解Navier-Stokes方程,模拟流体在三维交叉裂隙内的流动状态,对裂隙宽度的取值标准进行探讨。结果表明,室内实验得到的流速Q和压力P具有二次项关系,可以用Forchheimer方程描述;通过理论推导和数值模拟计算得到的单裂隙段的Re和实验结果基本吻合,验证了实验结果的正确性及数值模拟的可靠性;根据研究,交叉裂隙的宽度应大于最大裂隙开度的8倍,流体的流动状态由线性转入非线性的临界Re的范围为12.33~61.67。
Quantitatively describing the seepage characteristics of cross fractures is the basis for defining the seepage characteristics of the entire fracture network. The three-dimensional artificial cross-fracture model was established and the high-precision seepage test system was established. The Navier-Stokes equation was solved to simulate the fluid flow in the three-dimensional cross-fracture, and the criterion of the value of fracture width was discussed. The results show that the flow rate Q and pressure P obtained by laboratory experiments have quadratic term relationship and can be described by Forchheimer equation. Re and experimental results of single fracture section calculated by theoretical derivation and numerical simulation are in good agreement with each other to verify that the experimental results are correct And the reliability of numerical simulation. According to the research, the width of cross fracture should be more than 8 times of the maximum fracture opening, and the flow state of fluid should change from linear to non-linear critical Re in the range of 12.33 ~ 61.67.