Abstract:

During the shield hoisting, the lateral pressure is mainly borne by the temporary ring beam; meanwhile, the stresses of surrounding soil are complicated. A threedimensional model of temporary ring beam is built and calculated. The calculation results are compared with conventional twodimensional model. Some conclusions are drawn as follows: 1) Twodimensional calculation has some disadvantages, such as too large bending moment and overconservative reinforcement, etc. 2) Compared with twodimensional calculation, threedimensional modeling calculation results are more rational. The study results can provide references for similar projects in the future.

Key words: Metro station, shield hoisting shaft, temporary ring beam, SAP2000, finite elements, threedimensional integral calculation, twodimensional calculation