某水电站大坝强震监测资料分析研究

Strong Motion Acceleration Recorded in Hydropower Dam Safety Monitoring Applied Research

本文以2015年5月21日20时零7分在贵州省贞丰县镇宁布依族苗族自治县交界处发生的3.0级地震为背景,从工程应用的角度介绍了水工建筑物强震动加速度记录及数据处理分析的方法。强震动加速度记录经过数据校正、滤波、降噪、积分、谱分析后,可得到速度、位移、场地卓越周期以及水工建筑物安全指数等,通过对震源的评估以及强震动参数值的计算,能快速对水电站大坝水工建筑物的安全进行震害评估。经计算,强震动记录值在本次地震中,最大峰值加速度值为53.1418Gal,最大加速度响应值周期为0.1s左右,傅里叶变换后得到的主频值在8~14Hz,水工建筑物安全指数y_a=1.06>1。综合分析后,判定本次地震对大坝结构安全无影响。

This paper took the 3.0 magnitude earthquake happened at 20 :07 :00 on May, 21, 2015 in Zhenfeng County, Zhenning Buyi and Miao autonomous prefecture, Guizhou province as the background and then introduced the correct treatment analysis method of hydraulic structure strong motion acceleration record. The integration and spectral analysis were conducted after the data correction along with filtering and denoising of strong motion acceleration record to obtain the velocity, displacement as well as the hydraulic structure security index. We carried out rapid earthquake disaster assessment on the hydraulic structure of hydropower dam through focus evaluation and calculation of strong motion parameter values. It was calculated that the maximum peak acceleration of the strong motion acceleration record value was 53.1418 Gal in this earthquake,maximum acceleration response cycle is about 0.1s, Fourier transform frequency value is about 8 ~ 14 Hz with the hydraulic structure security index y_a=1.06>1.After comprehensive analysi, we determinethat this earthquake had no impact on the dam.