不过水围堰隧洞导流方案洞径及围堰高度的多目标择优

本文采用系统工程方法，拓展了单纯费用指标的单目标优化计算，提出费用和工期两个目标，根据工程实际情况，建立了多目标数学模型，求得非劣方案集。最后，采用近似理想点原理，对各非劣方案进行排序评价，选择出最优洞径及围堰高度。

Multi-objective optimal selection of cofferdam height and tunnel diameter under non-overtopped cofferdam condition

By employing the method of system engineering, the optimal computation based on single objective costis developed to two objectives-cost and time limit of a project. A mathematical model of multi-objectives is'established according to practical conditions. By solving the model, a group of noninferior solutions is obtained. Then by using the theory of approximate ideal points and by arranging the priority order of all noninferior solutions, the optimal cofferdam height and tunnel diameter are chosen.