Vibrations from trains can cause annoyance to people as well as damage to nearby buildings. Trains running on surface railways can cause vibrations at frequencies mostly below 20Hz. At low frequencies the maximum level of vibration is highly dependent on train weight as well as train speed. This limits the allowable axle loads and speed for this kind of traffic. To permit higher axle loads or higher train speeds, sometimes it is necessary to reduce the level of vibrations induced in the soil. Stabilization of underlying soil by for example lime-cement column is one of the methods that can be used for this purpose. This method is adopted at Ledsgard in southern Sweden in order to solve the problem of extensive ground vibrations due to the passage of X2000 high-speed trains. This unique opportunity has been used to study the ground vibrations both before and after the stabilisation. Furthermore ground vibrations measured in this way are compared with the results from numerical models of the problemin order to develop effective tools for designing countermeasures in other areas with ground vibration problems.
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