This paper attempts to address the issues of the large test site,high cost and difficult envi-ronmental simulation on the collapsible support rod hydraulic dam before applications.The study involves establishing a three-dimensional visual solid model according to the geometric parameters of the actual en-gineering design of collapsible support rod hydraulic dam;and simulating and analyzing the overall vibra-tion frequency of the hydraulic dam in different water pressure,at different opening and closing angles under the structural stress,deformation and fluid-solid coupling by using the finite element software.The results show that the dam body stress deformation increases with the increase of water retaining height and hydrostatic pressure.Compared with it in air,with the increase of the height of the water retaining,the vibration frequency of the dam is gradually reduced.The larger the contact area between the water body and the dam body,the more obvious the vibration frequency of the water body on the dam is;and with the opening and closing angle of the dam 80° and retaining height of 3 m,the first-order vibration fre-quency compared with the no-water condition,the maximum reduction is 62.5%.
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