EXPERIMENTAL STUDY ON 3D GEOMECHANICAL MODEL OF DEEP AND LONG TUNNEL

This paper evaluates surrounding rock stability and tunnel spacing of rationality of the long and deep tunnel.3D geomechanical model way is used to study the surrounding rock total stability and the effects mutually from adjacent tunnel excavation under high geostress and high groundwater pressure.3D geomechanical model results are compared with 3D Elastoplastic FEM calculated results. Research results show that the results of 3D geomechanical model experiment and 3D Elastoplastic FEM consideration are consistent. The displacement fields, stress fields and yield area range are consistent. Tunnel project with Ⅲ class of surrounding rock mass is safe under high geostress and high groundwater pressure. Limit overload safety factor is general more than 1.3, experiment with overload under high geostress surrounding rock. The influence area of displacement and stress of excavation tunnel is generally less than one times the tunnel hole diameter range. The tunnel spacing is apposite.