城市污水管网可行管径法优化设计

Optimum Design of Urban Sewer System Using Feasible-diameter Method

根据污水管网中的管段流量，按照设计规范的要求和管道系列标准管径建立与流量对应的各管段可行管径序列及其坡度和充满度矩阵，然点后以各管段某一管径组合构成可行管径的状态集合，并以最大可行管径组合作为初始状态，运用动态规划思想从下游至上游逐步进行决策计算，寻求经济最优的可行管径集合，从而实现整体管网的管径和埋深的优化设计方案．本方法的优点是优化计算精度得到了提高，并显著减少了计算工作量和计算机内存储量．

Based on the flow in each pipeline and the requirements of design rules for urban sewer systems,the feasible diameters of the pipelines can be chosen as the basic data for optimizing design of the sewer networks.The gradients and the rates of fulness of the pipelines can be calculated for optimizing design. Applying the principles of dynamic programming method, by taking the feasible maximum diameters of all pipelines as initial status,a computional process from the down stream of the pipelines to their upstream was carried out to minimize the cost ofthe sewer system. This new method using feasible diameters has shown that the optimized results are more accurate and that the required computer memory is smaller and the required time of compution is shorter compared with the existing methods for the same purpose.