Abstract: The design aspects of Matoushan tunnel in the second line of WestEast Natural Gas Transmission Project is introduced in this paper. The comprehensive design considered the characteristics of the pipelines and the geological and hydrological conditions of the project site. The paper discusses the design aspects of the cross section dimension and shape of the tunnel, tunnel lining, excavation and drainage measures. The location of the pipeline and its stability has also considered. Construction safety, environmental disturbance and erosion control aspects are discussed in the paper.

Key words: Pipeline tunnel, Design methodology, structural calculations