+44 3308180992Sanjivanee Kamble*, Patil AV, Harshavardhan Deshpande
NATM is a design philosophy as well as a construction process. The idea is to reinforce the tunnel construction as much as possible by utilizing the strength of the surrounding earth. Put another way, the tunneling process is dictated by the ground conditions. Constant monitoring is also encouraged by the NATM ideology. The study investigates the structural behavior of concrete linings in Mumbai Metro Line-3's Sahar Road crossover, focusing on the comparison between the New Austrian Tunneling Method (NATM) and Tunnel Boring Machine (TBM) utilization. The research aims to understand the effectiveness of these methods in ensuring the integrity and stability of tunnel constructions. The research compares various load combinations at different sections and parts of the crossover. Stress resultants, including axial force, moments, and shear forces, are analyzed using STAAD Pro software to understand the concrete tunnel lining's structural behavior accurately. Additionally, Von Mises stresses are used to predict the behaviors of SCL under the complex loading. Principal minor and major resultant stresses are scrutinized. The design of the final lining in underground works through NATM (New Austrian Tunneling Method) incorporates a comprehensive approach, encompassing software analysis, conventional concrete lining principles, and the implementation of Steel Fiber Reinforced Sprayed Concrete Lining (SCL). This multi-faceted design methodology ensures the structural integrity and safety of the final lining in underground constructions.
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