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中文摘要：
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。
英文摘要：
The risk of failure of improving the existing dam safety during construction must be considered and weighed against the benefit obtained from the modification, and what can be done to minimize the risk during construction should be taken into account. In Tsengwen Dam Raise Reservoir Water Level Project at Taiwan, the greatest construction risk is the overtopping of the dam by flood when the crest is lowered by excavations. To secure the darn safety during construction, based on seepage analysis, required freeboard elevation check, stability and dynamic stress analysis of the dam, and flood routing, and considering the balance between optimum performance of the existing dam and economy and construction schedule, a compromise and integrated design should be needed instead of the mere construction of either a new upstream or a downstream filter zone.
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