Study on Stress Field Distribution during the Construction of a Group of Tunnels Using the Pile–Beam–Arch Method

To study stress field distributions during the construction of a group tunnels using pile–beam–arch method, excavation for an underground station Beijing subway line 7 was taken as engineering problem, and numerical structural model tunnel built with aid software. In this model, four stress-monitoring planes were set up to extract data obtained from monitoring stress. The pilot simulated according six established schemes, images generated distribution on each plane different schemes. Finally, verification physical tests carried out. results show that effect vertical in has range is essentially equal twice width station. After tunnels, peaks appeared both at tops between bottoms tunnels; moreover, valleys tunnels. Pilot located top less affected than bottom concentration factor point extreme verified simulation variation law.