Route Planning and Tunnel Design & Construction of Sinkansen in the Shirasu Area

Abstract

The Shirasu of special geology is distributed over a wide area of south Kyushu. When building the Shinkansen in this area, it becomes key subject that the method of tunnnel construction under the groundwater is used.
This paper describes as three considerations at stages of route plannig and design & construction stage of tunnnel. That are (1) the consideration of vertical location of rail line, and (2) new type permeable roadbed used slag, (3) tunnnel face stability by drain method of well point.