摘要
采用直接滤频法对蓄水后的鲁布革水电站心墙堆石坝进行自振特性分析，其结果是前五阶自振频率间隔较密，频率皆较低，说明该坝对低频振动更为敏感。从顺河、铅直和坝轴线３个不同的方向输入不同频率的简谐波，其幅频反应：顺河向激振，位移反应最大；铅直方向激振，加速度反应最大；最大位移反应出现在激振频率较低时段，最大加速度反应出现在激振频率与软化后坝体某阶自振频率相近时。由于影响坝坡抗震稳定的主要因素是加速度放大倍数，所以不能忽略铅直向和坝轴线向的地震波输入。
The direct filtering frequency method has been adopted for analyzing the free vibration characteristics of the core type rockfill dam of Lubuge Hydropower Station after impounding.The results show that the interval free vibration frequency between first five steps are closer and the frequency is low,that is,the dam is more sensitive to the vibration with low frequency.The simple harmonic waves with different frequencies have been input in three directions of parallel and vertical to the river and along the dam axis.The results are shock vibration in parallel river with the maximum displacement reflection and shock vibration in vertical direction with the maximum acceleration reflection.The maximum displacement reflection occurs in the period of low shock vibration frequency and the maximum acceleration reflection occurs in the period when the shock vibration frequency is close to the free vibration frequency of the softened dam.The amplifying times of acceleration is the key factor of influencing the seismic stability of dam slope so that it should not be neglected for those earthquake waves from the vertical and dam axis directions.
出处
《水力发电》
北大核心
1997年第10期10-13,共4页
Water Power
关键词
水电站
心墙堆石坝
自振特性
幅频反应
Lubuge Hydropower Station,core type rockfill dam,free vibration characteristics,direct filtering frequency method,frequency range reflection,analysis
