拉西瓦拱坝环境振动测试与分析  

Testing and Analysis of Environmental Vibration at Laxiwa Arch Dam

作　　者：武志刚 向致谦 李帅 罗广衡 王进廷[2] WU Zhigang;XIANG Zhiqian;LI Shuai;LUO Guangheng;WANG Jinting(State Power Investment Corporation Qinghai Yellow River Electric Power Technology Co.,Ltd.,Xining 810016,Qinghai,China;Department of Hydraulic and Hydropower Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国家电投集团青海黄河电力技术有限责任公司,青海西宁810016 [2]清华大学水利水电工程系,北京100084

出　　处：《水力发电》2020年第8期64-67,70,共5页Water Power

基　　金：国家自然科学基金项目(51639006,51725901)。

摘　　要：坝体的环境振动测试是监测大坝健康状态的主要内容之一,通过环境振动试验研究了拉西瓦拱坝的坝体振动特性;基于振动试验结果,分析了坝体振动的时空分布规律,并对比分析了泄洪和非泄洪时的坝体振动特性差异。试验成果表明,拉西瓦拱坝的环境振动幅值在时空分布上有一定的随机性。总体而言,泄洪期间的振动幅值显著大于非泄洪期间的振动幅值;对于同一工况,振动幅值从坝顶中部向两岸坝肩先增大后逐渐减小。该研究成果可作为坝体损伤检测、状态评估和健康监测的基础。The environmental vibration test of the dam body is essential in monitoring the health condition of the dam.The vibration characteristics of Laxiwa Arch Dam are studied through the environmental vibration test,and the spatial and temporal distribution of dam vibration is analyzed based on test results.The differences between the dam vibration characteristics during flood discharge and non-discharge are compared and analyzed.It is showed that the environmental vibration amplitude of Laxiwa Arch Dam has a certain randomness in the spatial and temporal distribution.In general,the amplitude of vibration during flood discharge period is significantly larger than the amplitude during non-discharge period,and under same operation condition,the amplitude of vibration firstly increases and then gradually decreases from the crest center to both abutments.The research results can be used as the basis for dam damage detection,operation state assessment and health monitoring in the future.

关 键 词：环境振动测试 幅值分析 泄洪 拉西瓦拱坝 

分 类 号：TV32.3[水利工程—水工结构工程]