Tunnel Series 3: NATM Tunnel Design ​

In the NATM method, the tunnel is excavated out in sections over a predetermined length. As a result, the tunnel is built in phases. The NATM method's stability depends in part on the fact that, if permitted to slightly deform, the ground can provide some of its own support. The NATM has frequently been referred to as a method where you can design the tunnel as you proceed, providing an optimized support based on observed ground conditions. However, it is actually an approach based on observed convergence and divergence in the lining as well as current rock conditions. 

With PLAXIS geotechnical analysis software, the prediction of ground movement during tunnelling can be efficiently captured. PLAXIS considers the nonlinear interaction between the tunnel and the surrounding soils, as well as the elastoplastic behavior and the complexity of the construction stages.  

Register for free to Tunnel Series 3 webinar

Attend this webinar to learn about:

• Modelling of NATM tunnels and incorporation of construction sequence in PLAXIS
• Analysis of settlement of  surrounding soil
• Assessment of impact of tunneling on adjacent structures