不连续界面渗流的堤防防渗膜防渗效果模拟研究  

Simulation Study on Seepage Control Effect of Dike Membrane at Discontinuous Interface

作　　者：刘志文 王媛 董琪 高山 LIU Zhiwen;WANG Yuan;DONG Qi;GAO Shan(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210024,China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University,Nanjing 210024,China)

机构地区：[1]河海大学水利水电学院,江苏南京210024 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210024

出　　处：《人民黄河》2024年第6期48-53,67,共7页Yellow River

基　　金：国家自然科学基金资助项目(U2240210)。

摘　　要：垂直防渗膜在堤防工程渗流控制方面有着广泛的应用,但在防渗膜周围水力梯度场的渗流计算方面仍然存在计算精度低等问题。为研究含材料、防渗体、防渗膜等不连续界面的渗流场分布规律,引入节点连续型权函数的数值流形方法,通过对比有限元法和数值流形法针对含不连续界面渗流水头和水力梯度分布规律的模拟结果,验证了数值流形法求解含不连续界面渗流问题的优势,与有限元法相比,数值流形法前处理更为简单且改进后的方法可以更准确地计算不连续界面处的水力梯度。以分淮入沂整治工程为例,采用节点连续型权函数的数值流形方法,研究有无垂直铺膜、铺膜长度、铺膜缺陷位置对堤防渗流的影响规律。结果表明:防渗膜插入黏土层后,防渗效果明显增强;膜破损后对渗流场的影响程度主要取决于破损位置所在地层,应当采取合理措施避免易渗地层中铺膜的破损。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.

关 键 词：数值流形法 改进权函数 垂直防渗 影响因素 数值模拟 

分 类 号：TV871.2[水利工程—水利水电工程]