数值模拟研究堤坝基岩软弱结构面形成集中渗漏通道

Research on form of concentration leakage access by numerical simulationin weak structure plane of dike bedrock

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。

Seepage deformation in embankment has been much studied, but only focus on quaternary loose stratum. As the complexity of the geological conditions, in a proper condition the weak structure of the bedrock may bring seepage deformation and form the concentration leakage access. Then, a model for concentration leakage has been founded in bedrock weak structure. According to its different penetrability, the formation of concentration leakage access, and the variety of seepage flow field by numerical simulation is studied. The results show that concentration leakage access in bedrock weak structure has a certain impact on the happened piping in the dike, and could make the piping expand. Finally, an example validates the rationality of the numerical analysis in a certain extent.