可折叠支撑杆式液压坝的静动力特性

Static and dynamic characteristics behind hydraulic dam with foldable support rod

针对可折叠支撑杆式液压坝在工程应用前存在试验场地大、成本高、环境模拟难等问题,根据实际工程设计的可折叠支撑杆式液压坝几何参数,建立三维可视化实体模型,利用有限元软件仿真分析了液压坝在不同水压下不同启闭角度时结构应力、变形和流固耦合作用下液压坝整体振动频率。结果表明:坝体应力变形随着挡水高度、静水压力增加而增加;与空气中相比,随着挡水高度的增加,闸坝振动频率逐渐降低;水体与闸坝接触面积越大,水体对闸坝振动频率越明显,闸坝启闭角度80°挡水高度为3 m时,一阶振动频率与无水工况相比最大降低幅度为62.5%。

This paper attempts to address the issues of the large test site,high cost and difficult environmental 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 engineering design of collapsible support rod hydraulic dam;and simulating and analyzing the overall vibration 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 frequency compared with the no-water condition,the maximum reduction is 62.5 %.