Simulation Study on Seepage Control Effect of Dike Membrane at Discontinuous Interface
Vertical impervious membrane has been widely used in seepage control of levee engineering,but there are still issues of low calcu-lation accuracy in seepage calculation of hydraulic gradient field around impervious membrane.In order to study the distribution law of seep-age field at discontinuous interface including material interface,impermeable body and impermeable membrane,the numerical manifold method of node continuous weight function was introduced.By comparing the distribution law of water head and hydraulic gradient with finite element method and numerical manifold method,the superiority of numerical manifold method in solving seepage issue with discontinuous in-terface was verified.Compared with the finite element method,the numerical manifold method was simpler and the improved method could calculate the hydraulic gradient at the discontinuous interface more accurately.Taking Diversion of Huaihe River into Yihe River Rectification Project as an example,using the numerical manifold method of node continuous weight function,the influence law of whether there was verti-cal film laying,film laying length and film laying defect position on the seepage of dike was studied.The results show that the anti-seepage effect increases obviously after the film is inserted into the clay layer.The influence degree of membrane damage on seepage field mainly de-pends on the stratum where the damage is located.Reasonable measures should be taken to avoid the damage of membrane in permeable stratum.
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