Research on Deformation Laws of Tunnel Heaving Floor and Ballastless Track with Double-block Sleeper Caused by Groundwater
The effect of water pressure can cause deformation of the tunnel heaving floor,and the transmission of deformation to the track can cause poor geometric state of the track.This article conducted in-depth research on the deterioration of track geometry caused by water pressure induced tunnel heaving floor from the perspective of changes in track geometry,and proposed an approximate calculation method for water pressure.A numerical calculation model for the ballastless track with double-block sleeper in a tunnel was established based on the load-structure method,and the geometric irregularity characteristics and variation rules of the track under the action of water pressure in different leveling layers were analyzed.The results show that the geometric irregularities of the tunnel heaving floor-ballastless track are the superimposed effect result of changes in the contact state between the track bed slab and the leveling layer,as well as the lateral deformation along the longitudinal direction of the track and within the tunnel cross-section.The action of water pressure can not only cause deterioration of the high and low geometric states of the track,but also lead to changes in the direction,horizontal orientation,and twisting deformation of the track.Due to the influence of pressure head and water pressure distribution length,the height,orientation,and horizontal variation curves of the inner and outer rails caused by water pressure have their own morphological characteristics,rather than a single parabolic or sinusoidal line.Through numerical simulation,the nonlinear mechanical behavior of the contact state of the heaving floor deformation in the tunnel bottom leveling layer was verified,and the formation mechanism of the triangular pit on the track under the heaving floor deformation was revealed.
high speed railwaytunnelnumerical simulationheaving floor deformationballastless track with double-block sleeperwater pressure actiontrack geometry state
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