高速公路对场地微振动背景影响的分析研究

A study on the influence on site-microquake by expressway

为了分析高速公路对场地微振动的影响,在高速公路旁边选择了几块环境相似的场地,进行间隔50m布点多测线测量,对测量得到的数据进行RMS值计算和功率谱密度分析后,得出微振动的能量主要集中在5￣15Hz之内,卓越周期为0.2￣0.1s。并得出了几块场地的微振动速度及位移的RMS值分布情况,还得出了该值随测点与高速公路的距离增加而衰减的简单关系以及该值在普通路基和高架桥路基高速公路影响下的不同衰减关系。

A new expressway is planned to be built beside a science and technology district in Shenzhen. To analyze the influence of it on the site-microquake, we were entrusted to select some other sites which are of similar environment. The surveying points were set every 50 meters to form several surveying lines in the site. By calculating the RMS-value and analyzing the power spectral density, we discovered that the main energy of the microquakes concentrated in the range of 5-15 Hz and the salience cycle was 0.2-0.1 seconds. Furthermore, the speed and displacing RMS-value distribution of the microquakes in the sites were obtained. We also gained the simple relation that the RMS value is attenuated while the distance is increased between the surveying point and the highway, and other different attenuated relations of the RMS value influenced by common roadbed and viaduct roadbed.