Abstract:

Reinforcement, including chemical anchor bolt, steel plate and inclined support, is made at the positions of lining with OCS anchor overlaps and midpoint anchors, in order to ensure the concrete to meet the stress limit of the drop tubes. The effect of the reinforcement described is studied by checking the concrete rigidity and the drop tube stress and by means of FLAC3D3.0 finite element numerical simulation. The study results show that the calculation results are consistent with the actual conditions. The practice proves that the reinforcement made is feasible and safe and that good social and economic benefits can be achieved. This paper can provide technical support and theoretical reference for similar projects in the future.

Key words: highspeed railway tunnel, overlap of OCS anchor section, midpoint anchor, lining reinforcement, drop tube, numerical simulation