Geosynthetics in the NATM Tunnel Designby Ronald K. Frobel, Chemie Linz US Inc, Evergreen, CO, USA,
Abstract: This paper describes the Design Methodology for the New Austrian Tunneling Method (NATM) with special emphasis on the geotextile and geomembrane commonly used in the waterproofing design for both hard rock and soft ground tunnels. Construction techniques using the combination of reinforced (or unreinforced) shotcrete initial lining, geotextile, geomembrane and cast-in-place concrete linings comprise the two main support elements, especially in soft ground (soils that possess good stand-up time) tunnels whereas the geotextile/geomembrane system provides the waterproofing, inner drainage and transition between the support elements.
Subject Headings: Soft soils | Tunneling | Construction methods | Soil stabilization | Geomembranes | Reinforced concrete
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