Rahim Hassani - MSc in Rock Mechanics Engineering, Iran Oston Consulting Engineers Company, Tehran, Iran
Rouhollah Basirat - Iran Oston Consulting Engineers Company, Tunnel Engineer; PhD Student in Rock Mechanics Engineering, Tarbiat Modares University, Tehran, Iran
Navid Mahmoodian - Head of Structural Engineering Department, Iran Oston Consulting Engineers Company, Tehran, Iran

Deformations and stress distributions in tunnel intersection areas are more complicated than those in common tunnels. In this paper, three dimensional numerical modeling is performed by considering hyperstatic reaction concepts. Designing is done for a real tunnel project. The numerical analyses were performed for Operational Design Earthquake (ODE) and Maximum Design Earthquake (MDE) loading conditions. The numerical results showed the maximum axial force and bending moment are occurred in the intersection of main and connection tunnels. Then, the stable lining for this section is obtained using axial force-bending moment interaction diagram. This numerical analyzing presented that HRM is a suitable, fast, and practical method for tunnel engineers.

Hyperstatic Reaction Method, Tunnel Junction, Intersection, Permanent Lining