The new Austrian tunneling method (NATM), also known as the sequential excavation method (SEM) or sprayed concrete lining method[1] (SCL), is a method of modern tunnel design and construction employing sophisticated monitoring to optimize various wall reinforcement techniques based on the type of rock encountered as tunneling progresses.

The New Austrian Tunneling Method (NATM), also known as the sequential excavation method, gained recognition during the tunneling operations in the Austrian Alps. The technique proved to be very useful in sophisticated and diversified geological conditions where forecasting ...

2018年12月5日 · NATM is best suited for short-range (> 2 km) tunnels in regions with variable soil conditions. Its philosophy and construction method yield a more cost-effective, flexible tunneling operation when compared with the other methods.

2004年1月20日 · The New Austrian Tunneling Method (NATM), also referred to as Sequential Excavation Method (SEM) or Shotcrete Method, was developed in the 1950s when shotcrete was first used systematically to stabilize squeezing ground in a water diversion tunnel at the Runserau Hydroelectric Power Project in Austria.

2021年1月1日 · The principle of NATM is to maximize surrounding soil capacity to support its weight and balance the stresses around the tunnel. Investigation of tunnel deformation is important to know...

1992年6月1日 · The New Austrian Tunneling Method (NATM), also referred to as Sequential Excavation Method (SEM) or Shotcrete Method, was developed in the 1950s when shotcrete was first used systematically to stabilize squeezing ground in a water diversion tunnel at the Runserau Hydroelectric Power Project in Austria.

There are seven features on which NATM is based: Mobilization of the strength of rock mass – The method relies on the inherent strength of the surrounding rock mass being conserved as the main component of tunnel support. Primary support is directed to enable the rock to support itself.

In the present work, important aspects of time-dependent nonlinear 3D finite element (FE) models for deep tunnel advance by the New Austrian Tunneling Method (NATM), characterized by repeated sequences of excavation, securing, and idle periods, are discussed on the example of a 3D finite element model of a stretch of the Brenner Base Tunnel ...

The New Austrian Tunneling Method (NATM) was developed in the 1960s. The main idea of this method is to use the geological stress of the surrounding rock mass to stabilize the tunnel itself. Based on geotechnical measurements, an optimal cross section is computed.

The basic principles of NATM are as follows: (i) prevention of disintegration of the rock mass; (ii) ascertaining that the additional stresses developing during excavation are received by the rock mass; (iii) monitoring of the behavior of the rock-tunnel system in order to observe the stabilization process and intervene with appropriate ...