ABSTRACT
The concrete slab ballastless track is an advanced track structure with high stability and integrity. It has been widely used in many high speed railway lines all over the world. However, when the foundation of ballastless track appears large uneven settlement deformation especially in roadbed section, compared with ballast track which can be restored by increasing the ballast under the sleepers simply, the smoothness of concrete slab ballastless track can only be restored by adjusting the thickness of the base plates of fastener system accordingly. But if continuous settlement deformation exceeds the specified adjustable range of fastener system, the smoothness of concrete slab ballastless track cannot be restored timely and completely, and then the speed of passing trains has to be limited to ensure the safety. To solve this problem only just using daily skylight time (only 4 hours every day), we systematically studied a complete set of new overall precision uplift rehabilitation technology including special grouting materials, dedicated miniaturization equipment and construction processes through a series of indoor reduced scale tests and field full scale simulations with real concrete slabs. And combined with field practices, the overall precision uplift rehabilitation technology for concrete slab ballastless track had been studied and developed.
