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以稳定渗流有限元分析方法为基础,结合优化设计中的参数敏感性分析方法和目标函数分析方法,将施工工期作为目标函数,将堰体下游出溢处水力坡降和围堰施工时间作为约束条件,进行大渡河某水电站围堰工程中悬挂式防渗墙深度的优化研究。分析了悬挂式防渗墙不同深度计算条件下的施工工期、下游出溢处水力坡降和堰体流量等敏感性因素,进而通过归一化思想得到它们分别与防渗墙深度的关系,再根据约束条件求取悬挂式防渗墙的最优化深度,并给出了优化深度的计算结果图。对悬挂式防渗墙深度的研究,不仅对于工程建设的时效性和安全性是必要的,而且为全面、合理的评价悬挂式防渗墙的功效提供了理论依据。
Based on the finite element analysis method of steady seepage, combined with the method of parameter sensitivity analysis and objective function analysis in optimization design, the construction period is taken as the objective function, and the hydraulic gradient and cofferdam construction time of downstream weir are taken as constraints Conditions, the Daduhe a hydropower station cofferdam hanging wall impermeable wall depth optimization. The construction period of the hanging seepage cutoff wall under different depth calculation conditions, the hydraulic slope gradient of the downstream overflow and the flow of the weir body are analyzed, and then the relationship between them and the depth of the cutoff wall is obtained through the normalized thinking According to the constraint conditions, the optimal depth of the hanging cut-off wall is obtained, and the calculation result of the optimal depth is given. The research on the depth of suspended cut-off wall is not only necessary for the timeliness and safety of engineering construction, but also provides a theoretical basis for comprehensively and rationally evaluating the effectiveness of suspended cut-off wall.