渗流计算中边界条件的不均匀性是很难处理的问题,为了求得可供实际应用的解答,往往引入平均值,等效地代替实际边界。例如做不完整并计算时,把沿井轴不均匀分布的流量,用一个平均流量替代这时井轴变为等强度汇线。又如闸坝地下轮廓设计时,用不是等压面的平面作为分界面,给计算结果带来误差等,都是局部边界影响问 The inhomogeneity of boundary conditions in seepage calculation is a difficult problem to deal with. In order to find a solution that can be applied in practice, an average value is often introduced to replace the actual boundary equivalently. For example, in the case of incomplete calculation, the well shaft is changed into an equal-intensity sink by using an average flow rate instead of the unevenly distributed flow along the shaft axis. Another example is the underground gate contour design, the surface is not equal pressure plane as the interface, the calculation results to bring errors, are the local boundary effects asked