Abstract:

The mined section of Gongbei tunnel is constructed by mining method under the protection of the pipe curtain. The working shaft of Gongbei tunnel is so complicated that many factors should be considered during the design of the working shaft. In the paper, the construction conditions of the project, the construction process of the tunnel and the operation and management requirements are analyzed and the key points of the design of the working shaft are determined; multifactor crosscoupling index system is used to determine the location of the working shaft, the calculation formula for the clearance of the working shaft is optimized, and fulllife structural design considering the pipe jacking of the tunnel is made. In the end, good effect has been achieved.

Key words: pipe curtain, mining method, tunnel, working shaft, design