论文部分内容阅读
利用宽频带数字测震仪监测的金沙江下游水库区常时地脉动和水库泄洪激发的振动记录,分析研究给出:常时地脉动信号出现在高频段1.9~12.0 Hz;相对应的卓越周期0.08~0.52 s。水库泄洪激发地动的信号包含多种振动和噪声成份,与常时地脉动信号相比,其出现在低频段,呈现出更长的周期。2012年10月向家坝水库泄洪激发的地动幅度值,随观测站离坝址距离的增大而衰减;坝址峰值加速度均值为1.9 mm/s2;峰值速度均值为0.08 mm/s;最大位移均值为95μm;仪器烈度值为4度,这与现场调查结果一致。
Using the broadband digital seismometer to monitor the vibration of reservoirs in the lower reaches of the Jinsha River and the flood records triggered by flood discharge, the analysis shows that: the pulsating signals always appear in the high frequency range of 1.9 ~ 12.0 Hz; the corresponding excellent cycles 0.08 ~ 0.52 s. The signals of reservoir excitation and flood excitations contain a variety of vibration and noise components, which appear in the low frequency band and show a longer period compared with the usual pulsation signals. In October 2012, the amplitude of ground motion induced by flood discharge to Xiangjiaba reservoir damped with the increase of the distance from the dam site. The average peak acceleration of the dam site was 1.9 mm / s2, the average peak velocity was 0.08 mm / s, and the maximum The mean displacement is 95μm; the instrument intensity is 4 degrees, which is consistent with the field survey.