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国内外学者对堤坝渗透变形进行了大量的研究,但是他们把注意力主要集中在第四系松散层上。软弱结构面在适当地质环境条件下,可形成集中渗漏通道。针对前人对此研究不足,建立了基岩软弱结构面集中渗漏通道模型。根据集中渗漏通道的透水性能不同,数值模拟研究了其形成过程,及此期间堤内流场的变化情况。结果表明:基岩集中渗漏通道的发育,对堤内已发生的管涌有一定的影响,存在促使其进一步冲蚀扩展的可能性。工程实例验证了数值模拟结果在一定程度上的合理性。
Scholars at home and abroad have done a lot of research on the infiltration and deformation of dykes, but they mainly focus on the Quaternary loose layer. Weak structural surface in the appropriate geological conditions, can form a concentrated leakage channel. Aiming at the deficiency of predecessors’ research, a model of concentrated leakage channel of soft rock is established. According to the different permeability of concentrated seepage channel, the formation process of the seepage channel was studied by numerical simulation and the variation of the flow field in the dike during this period was also studied. The results show that the development of centralized leakage path of bedrock has certain influence on the pipe bursting occurred in the embankment, and there exists the possibility of further erosion expansion. The engineering example validates the numerical simulation results to a certain degree of rationality.