Possibilities of seismic equipment for roadbed railway monitoring in areas with difficult ground conditions

Based on the experience of using broadband seismic equipment for monitoring the ground of the base of the railway track for the Northern Railway using the train as a source of the probing signal, the possibility of monitoring the state of the soil of the base of the roadbed by passive seismic methods was experimentally shown and confirmed by modeling. Field observations showed that recordings at low frequencies (0.01 Hz) significantly differ in neighboring sections of the path - favorable and unfavorable, with the horizontal components being the most informative. Records at frequencies of 2-8 Hz are characterized by significant changes in the ratio of the amplitudes of the vertical and horizontal components during seasonal watering. The parameters of seismic monitoring are determined: equipment and data processing methods by which in situ it is possible to judge the change in the state of soils, the possibility of identifying stages of soil freezing and thawing and the associated negative processes is discussed.