Analysis on ground motions induced by high-speed trains and its influence on information detection of earthquake
Wang Yu-sh · Earthquake Engineering and Engineering Dynamics · 2014
The seismic monitoring systems for high-speed railways were constructed simultaneously with high-speed railways itself. But the information detection of earthquakes was interfered with ground motions which were induced by high-speed trains transmitting through viaducts or embankments,for the seismic monitoring points were close to the railways because of practical restrictions. The observation at four seismic monitoring points of Harbin-Dalian passenger dedicated line indicated that the ground motions induced by high-speed trains were with larger amplitude but attenuated fast with distances,as the PGA attenuated from 1 ms- 2to 0. 01 ms- 2in only 100 meters. Taking the acceleration record at Hunnan seismic monitoring point as an example,the analysis of interference on seismic alarm threshold and P phase picking showed that the ground motions induced by high-speed trains were non-negligible in seismic information detection. Meanwhile,high-cut filtering with an appropriate cutoff frequency could reduce this interference,and a more reliable picking of P phase onset time could be achieved by integrals of acceleration record.