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南水北调中线工程中,渗流问题是影响渠道衬砌及渠坡稳定的关键因素之一,在具有承压水地层的深挖方渠段尤其如此。为更全面分析该类渠段渗流场分布特征及渗控措施合理性,采用渗流自由面、密集排水孔三维有限元精细模拟技术,针对典型深挖方渠段建立渗流模型,模拟渠道渗流场分布,分析渗控措施的效果。结果表明,在具有承压水地层渠段布置排水垫层,并结合逆止阀以及渠坡排水孔等综合措施,能有效降低渠底衬砌板下扬压力,为工程安全运行提供有力保障。
In the mid-route of South-to-North Water Diversion Project, the seepage problem is one of the key factors affecting the stability of channel linings and drainage channels, especially in deep excavation of confined water channels. In order to comprehensively analyze the distribution characteristics of seepage field and the rationality of seepage control measures, the seepage flow model was established for the typical deep excavation of the side channel, and the distribution of the seepage field in the channel was simulated by using the three-dimensional finite element simulation technology of seepage free surface and dense drainage hole. , Analyze the effect of infiltration control measures. The results show that the combination of the check valve and drainage hole of drainage slope can effectively reduce the downward pressure of the lining of drainage tunnel and provide a strong guarantee for the safe operation of the project.