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针对过水围堰初期导流费用的构成及其随机特性，首次提出了费用风险率的概念并给出了研究费用风险率的计算模型，从而为施工导流风险设计提供科学的依据．
Aiming at the composition and random characteristics of the initial diversion cost of the cofferdam, the concept of the cost risk ratio is proposed for the first time and the calculation model of the research cost risk ratio is given, which provides a scientific basis for the design of construction diversion risk.