隧洞爆破地震波作用下临近水电站的安全性评估

为了评估隧洞爆破地震波作用下临近水电站的安全性,结合深溪沟水电站安装间灌浆排水廊道的掘进爆破开挖工程,利用TC-4850测震仪对临近发电厂房、机组及其他重点保护对象进行爆破震动监测。首先将实测数据进行震动波形、时能密度和震速峰值分析,然后采用一元回归方法分析爆破震动衰减规律,预测不同单响药量和不同爆心距下质点震动幅值,通过与国家爆破震动安全控制标准比较,评估爆破震动的安全性。研究结果表明:现场监测结果与回归分析的理论预测结果相吻合,隧洞爆破震动对临近水电站安全运营的影响较小,采用上述分析方法能够合理地评估隧洞爆破地震波作用下临近水电站的安全性。

Safety Evaluation of Adjacent Hydropower Station under Tunnel Blasting Seismic Wave

To evaluate the safety of hydropower station impacted by tunnel blasting seismic wave,based on the project of excavation blasting in erection bay grouting drainage gallery by Shenxigou hydropower station,the blasting vibration data of power house,generator unit and other key protection objects were tested by TC-4850 vibrometer.Firstly,the vibration waveform,time-energy density and the peak value of the blasting vibration were analyzed through the experimental data.The unary regression analysis method was used to analyze the attenuation law of blasting vibration and to predict the peak value of particle vibration with different explosive charge and different blast center distance.The predicting results were compared with the national safety control standard of blasting vibration so as to evaluate the safety of blasting vibration.The results show that the field monitoring data coincided well with the theoretical prediction and the blasting vibration made little effect on the safe operation of adjacent hydropower station.As a result,the influence of blasting seismic wave on the safety of adjacent hydropower station can be evaluated reasonably by the method above.