某线震后轨道设计方案研究OA

On January 8,2022,a 6.9-magnitude earthquake occurred in Menyuan,causing serious damages to the foundation and equipment such as the collapse of the secondary lining,the displacement of the beam body,the fall off of the overhead contact system,and accompanied by rail fracture,fastener fall off,track bed overturn and other track seismic disasters.It is the first serious disaster event under the action of a strong earthquake that China's high-speed railway has encountered.Based on the geological prediction of the residual slip deformation level of 150～300 mm and vertical 100 mm,this paper puts forward a new large adjustment ballastless track structure scheme of"adjustable WJ-8 fastener+long sleeper embedded single-layer track bed reserved cutting hole of three hole conjoined casing rail bearing platform"in the fortified section.Among them,the improved WJ-8 fastener can meet the requirement of 152 mm left and right position adjustment of single rail by adding iron rail support platform,distance adjusting block and triple sleeve on the basis of the existing WJ-8 fastener.Cutting holes are reserved in the embedded single layer track bed of long sleepers to facilitate cutting and correction after the foundation deformation exceeds the adjustment range of fasteners.Through the line fitting after the residual slip deformation,the offset envelope table is obtained,and the laying range of ballastless track with large adjustment is determined.