RESEARCH ON THE DEFORMATION LAW OF SMALL CLEAR DISTANCE TUNNEL CONSTRUCTION BASED ON STEP METHOD
The construction of a small net distance tunnel in Weihai is taken to study the methods for reducing the construction cost and shorten the construction period of a small net distance tunnel,in which a combination method of on-site measurement and numerical simulation is proposed to analyze the deformation law of the surrounding rock during the dynamic excavation process of the small net distance tunnel.The deformation law of the surface settle-ment and arch settlement of the tunnel constructed by the step method is obtained.Basing on the plastic zone of the surrounding rock,reinforcement measures for the surrounding rock of the step method construction tunnel are pro-posed,providing the guidance for safe tunnel construction.
small interval tunnelarch settlementplastic zone of surrounding rock