Abstract:

In this article, the construction cycle time and construction model of Songshanhu tunnel on DongguanHuizhou intercity railway are analyzed, and comparison and contrast is made between national railway tunnels and intercity railway tunnel. It is believed that the requirements specified in Tiejianshe No. ［2010］120 are not applicable to the construction of intercity railway tunnels. Proposals made are follows: 1) For intercity railway tunnels in Grade Ⅵ surrounding rock, the distance between the primary support and the working face should be optimized from 35 m to 50 m, and the distance between the secondary lining and the working face should be optimized form 70 m to 85 m; 2) For tunnels in Grade Ⅴ surrounding rock, the distance between the primary support and the working face should be optimized from 35 m to 55 m, and the distance between the secondary lining and the working face should be optimized form 70 m to 90 m; 3) For tunnel in Grade Ⅳ surrounding rock, the distance between the primary support and the working face should be optimized from 35 m to 65 m, and the distance between the secondary lining and the working face should be optimized from 90 m to 120 m. 

Key words: intercity underground railway tunnel, grade of surrounding rock, distance between primary support/secondary lining and working face, tunnel crosssection