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基于单裂隙非饱和渗流入侵概念模型,考虑裂隙排水起始毛细压力及排水过程开度范围等因素,推导了单裂隙非饱和渗透的饱和度与毛细压力及相对渗透系数的本构关系,根据有关试验资料进行了模型的验证分析。研究表明:推导的单裂隙饱和度与毛细压力关系与试验结果吻合较好,饱和度与相对渗透系数关系与经典模型具有良好可比性。考虑裂隙空隙存在非连通情况及起始毛细压力机制,引入压力修正项,同时考虑最小及最大排水概率开度能使入侵概念模型更符合实际。最后采用离散元软件UDEC应用本模型进行了单裂隙非饱和排水过程模拟,计算结果与Van Genchten模型结果接近反映模型合理。
Based on the conceptual model of single-fractured unsaturated seepage intrusion and considering the initial capillary pressure of drainage and the opening range of drainage process, the constitutive relation between the saturation of single-fractured unsaturated permeate and capillary pressure and relative permeability coefficient is derived. According to the related The experimental data were verified by the model. The results show that the relationship between single-fracture saturation and capillary pressure is in good agreement with the experimental results, and the relationship between saturation and relative permeability coefficient has good comparability with the classical model. Taking into account the existence of non-connected cracks in the gap and the initial capillary pressure mechanism, the introduction of pressure correction term, taking into account the minimum and maximum drainage probability of opening can make the conceptual model of invasion more realistic. Finally, the discrete element software UDEC was used to simulate the single-fractured unsaturated drainage process. The calculated results are close to the results of the Van Genchten model to reflect the reasonable model.