高坝泄洪诱发场地振动特性原型观测分析

发布时间：2018-06-06 08:29

本文选题：泄洪 + 环境振动　；参考：《水力发电》2017年03期

【摘要】：针对近期出现的高坝泄洪诱发场地大范围振动问题,通过系统的现场观测,研究了泄洪诱发的环境振动特性。观测表明,泄洪引起的场地、结构振动具有持续、低频、微幅、冲击等鲜明特征,振动主频1.5~3 Hz,传播距离远、影响范围大,与常见的高频环境振动明显不同;城区环境振动具有明显的分布特征和变化规律,受泄量、调度方式、地质条件等影响较大,居民楼随高度增加振动有明显的放大效应,水平向与竖直向差异明显,软基上的居民楼顶楼振动最大应当重视。大范围低频环境振动的减振难度很大,从源头优化调度减小激励是当前有效措施之一,减振措施与抗振安全评价仍需进一步研究。
[Abstract]:In order to solve the problem of large-scale vibration induced by flood discharge of high dam in recent years, the characteristics of environmental vibration induced by flood discharge are studied by systematic field observation. The observation shows that the structural vibration of the site caused by flood discharge has the distinct characteristics of persistence, low frequency, micro amplitude, shock, etc. The main frequency of vibration is 1.5Hz3 Hz, and the propagation distance is long and the influence range is large, which is obviously different from the common high frequency ambient vibration. The environmental vibration in urban area has obvious distribution characteristics and variation law, which is influenced by discharge, dispatching mode, geological conditions and so on. The vibration of residential building increases with the height, and the difference between horizontal and vertical direction is obvious. The maximum vibration of residential building roof on soft foundation should be paid attention to. It is very difficult to reduce the vibration in a large range of low frequency environment. It is one of the effective measures to reduce the excitation from the source optimization. The vibration reduction measures and the evaluation of the anti-vibration safety still need to be further studied.
【作者单位】：南京水利科学研究院;水文水资源与水利工程科学国家重点实验室;通航建筑物建设技术交通行业重点实验室;
【基金】：国家自然科学基金面上项目(51479124,51479125) 南京水利科学研究院基金面上项目(Y115006)
【分类号】：TV698.1

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