土坝铺盖渗透计算方法,有流体力学方法和水力学分段法二种。由于边界条件复杂,流体力学方法只有假定铺盖不透水的解答、故其精度不如水力学分段法高、因此目前一般采用水力学分段法。水力学方法是假定在任意垂直断面上的水平流速相等,要求流线为水平直线,即所谓久平假定。这个假定是近似的,因为在进出口附近的流线一般都是弯 Earth dam cover seepage calculation method, there are two methods of fluid mechanics and hydraulics method. Due to the complicated boundary conditions, hydrodynamics method is only assumed to cover the impermeable solution, so its accuracy is not as high as the hydraulic sectioning method, so the current hydraulic sectioning method is generally used. The hydromechanical method assumes that the horizontal velocities are equal at any vertical section, requiring the streamline to be a horizontal straight line, the so-called long-lasting assumption. This assumption is approximate because the streamlines near the entrances and exits are generally curved