The tunnel invert underlain by geostress and hydrostatic pressure in water-bearing strata has led to upwarping deformation and planar displacement of CRTSⅠ bi-block ballastless track bed slab,with maximum upwarping deformation reaching 47.1 mm and maximum lateral shift of 10 mm,surpassing the adjustable range of conventional fasteners.This paper presented a technology utilizing wire saw cutting of the invert infill(levelling layer)to facilitate separation and track lowering of the track bed from the underlying tunnel structure,incorporating jacks,horizontal push devices,air cushions,and other means for planar position or elevation adjustments of the track bed.Results demonstrate that this technology circumvents the need for disruptive and costly dismantling and reconstruction associated with extensive track bed and invert infill replacement,preserves the integral load-bearing capacity of the ballastless track structure,and yields significant economic and social benefits.The findings offer valuable references for addressing large-scale linear displacements in similar track bed scenarios.
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