Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

For the application of TBM tunneling method, both tunnel design standards and design and construction practices in Korea and foreign countries were analyzed. According to the analysis the number of lanes and the inner shape (single layer or duplex layer) vary depending on the volume of traffic. Also extra space located in the top and bottom of tunnel is used in multipurpose such as ventilation, disaster prevention, maintenance and administration. To find the ratio of cross section according to the components of road TBM tunnel, a standard section was considered as a two-lane road. Then, the analysis of cross section of this section which consists of components for clearance, extra space in upper and lower tunnel was carried on two widths of shoulder. In addition, after a structural analysis, a thickness requirement of lower slab which is essential for road tunnel was derived for a few supporting types. Through correlation analysis, the ranges of available cross-sectional area between slab thickness and lower extra space of the tunnel was presented.