To explore the seepage characteristics of cut-through fractured rocks after different temperatures, sandstone in the Hunan area was selected as the research object. First, the influence degree of different temperatures on the permeability of fractured sandstone was studied, and the permeability variation of fractured sandstone with net confining pressure was revealed. The test data was nonlinearly fitted to prove that the relationship between permeability and net confining pressure conforms to the characteristics of the negative exponential function. Second, the macroscopic fractured state of sandstone after different temperature treatments was analyzed, and it is concluded that the inclination angle of the fracture surface decreases with the applied thermal temperature, the fracture surface gradually develops into a single shear failure surface, and the damage degree becomes more and more serious. Finally, the theoretical formula for the calculation of fractured seepage was introduced, and the FLAC^3D embedded fish language was used to compile the seepage-stress coupling calculation program of the fractured sandstone after different temperature treatments. Numerical calculations were carried out based on samples with different fracture angles of fractured sandstone, and the calculated values were in good agreement with the test results. The research results can provide guiding significance for the research on the influence of high temperature in fire tunnel on the evolution of permeability of surrounding rock fissures.

中文翻译：

---

不同温度处理后砂岩的贯通裂隙渗流特性及数值模拟

为探究不同温度下切穿裂隙岩的渗流特征，选取湖南地区砂岩为研究对象。首先，研究了不同温度对裂隙砂岩渗透率的影响程度，揭示了裂隙砂岩渗透率随净围压的变化规律。对试验数据进行非线性拟合，证明渗透率与净围压的关系符合负指数函数的特征。其次，对不同温度处理后的砂岩宏观断裂状态进行了分析，得出断裂面倾角随着外加热温度的增加而减小，断裂面逐渐发展为单一的剪切破坏面，并且破坏程度越来越严重。最后，介绍了裂缝渗流计算的理论公式，FLAC^采用3D嵌入式鱼语言编写不同温度处理后裂隙砂岩渗流-应力耦合计算程序。对不同裂隙砂岩裂隙角的试样进行了数值计算，计算值与试验结果吻合较好。研究结果可为消防隧道高温对围岩裂隙渗透率演化的影响研究提供指导意义。