Analysis of Plastic-zone Radius Influenced by Mechanical Parameters in Tunnel Excavation and Support

摘要

According to the elastic-plastic theory,the analytical formula of plastic-zone radius is established for circular tunnel in its excavation and support,and the effect of anchor support is verified based on the radius of plastic zone from the perspective of measured axial force.The influences to plastic zone by the variations of mechanical parameters and resistance of support are quantitatively analyzed.The result is of great significance to the monitoring measurement and the dynamic design and construction of tunnel.