Displacement Characteristics of End Thorn Structure of Longitudinally Connected Slab Track During Operation Period
Research purposes:The Π-type end thorn anchorage system is the key part to limit the displacement of track structure in the transition section of longitudinal slab track.In this paper,considering the nonlinear interaction between track structure and bridge,friction plate,end thorn and soil,an integrated calculation model of track-bridge-subgrade-anchorage structure is established,the displacement characteristics of anchorage structure in service state are studied,the influence of different void positions between end thorn and subgrade on structural displacement is analyzed,and the strengthening scheme of filling void between layers and strengthening subgrade soil strength by grouting is put forward,and its feasibility is demonstrated.Research conclusions:(1)After the end thorn is completely disconnected from the subgrade,the longitudinal displacement increases greatly and exceeds the displacement limit of 3 mm.The friction resistance and anchorage force of the subgrade against the end thorn caused by the void will lead to excessive displacement of the end thorn.(2)The void of subgrade in friction plate has little influence on end thorn displacement.The difference of longitudinal displacement caused by the void and complete void is only 0.11 mm,so the void of subgrade in the main void area is the main cause of excessive displacement of structure.(3)When grouting is used to reinforce the subgrade in the void area,the longitudinal displacement of the end thorn is reduced by about 3.5 mm,and the displacement state of the anchorage structure is restored to a degree similar to the normal service state.(4)This study can provide a theoretical basis for the treatment of excessive displacement of Π-type end-piercing anchorage in site.
subgrade-bridge transition sectionΠ-type end thornvoidexcess displacementgrouting reinforcement
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