https://mts.intechopen.com/articles/show/title/stability-analysis-of-circular-tunnels-in-cohesive-frictional-soil-using-the-node-based-smoothed-finIn this chapter, the stability of a circular tunnel and dual circular tunnels in cohesive-frictional soils subjected to surcharge loading is investigated by using the node-based smoothed finite element method (NS-FEM). In the NS-FEM, the smoothing st…