To study more and more serious vibrations problem induced by moving train traffic in urban areas

in a residential district near Jing-Guang Railway

field tests of velocity and acceleration vibrations of ground were carried out during train moving; and some conclusions were drawn. It is shown that the vibrations of ground due to moving train rise with train speed or axle load increasing. Generally

when speed of train increases 10 km per hour

the vibrations level raises 3 dB

while at the same speed

vibration induced by freight train is bigger than passenger train because of the difference of axle load. In the test

at speed of 50 km per hour or so

the vertical velocity vibration induced by freight train is about 10 dB bigger than that of passenger train

and as for the difference of lateral velocity vibration

this magnitude is about 5 to 15 dB; moreover

as for the difference of vertical and lateral acceleration vibrations

they are 12 dB and 8 dB respectively. The vertical velocity vibration of ground near the joints of rails is 2 to 6 dB bigger than the other positions far from joints. Ground vibration decreases gradually with increasing in the distance between testing locations and rail; and there is a fluctuated characteristic of the decay process for vertical vibrations; while the lateral vibration decreases monotonically with increasing in the distance between testing locations and rail.