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在对已建坝的加固过程中,必须考虑施工中的溃坝风险,权衡加固将产生的效益,考虑将风险降到最低程度的施工措施。在台湾省曾文坝水位抬高项目建设中,最大的施工风险是当坝顶因开挖而降低高程时洪水引起的漫顶。为了保证施工期的安全,根据渗流分析,超高复核,大坝动应力及稳定性分析,洪水演进分析等成果,权衡了大坝的性能、经济效益及加固工期等要素,提出了一个更为全面妥善的设计方案,而不是仅仅简单地在上下游铺设滤层。
In the process of strengthening the constructed dam, we must consider the risk of dam break during construction, weigh the benefits of reinforcement, and consider the construction measures that minimize the risk. In the construction of the Tseng Moon Dam elevation project in Taiwan, the biggest construction risk is the overhang caused by the flood when the crest is lowered due to excavation. In order to ensure the safety of the construction period, according to the results of seepage analysis, ultra-high check, dynamic stress and stability analysis of dam, flood evolution analysis and other factors, the factors such as dam performance, economic benefits and reinforcement period are weighed out, Instead of simply laying down the filter layers in the upstream and downstream, a comprehensive and well-designed solution is available.