The Interaction Of The Tunnel Construction With The Surrounding Rock And The Treatment Of The Fault

In recent years,the cause of China's rapid development of subway,subway in big city needs the subway construction is due to grow with each passing day,to facilitate people's travel and ease the traffic pressure,therefore,the choice of the line,the subway tunnel will inevitably need to live through the broken zone of fault.How to ensure the subway tunnel crossing the active fault fracture zone to achieve the safety requirements of large earthquakes without collapse and post earthquake repairable under fault dislocation? It brings new challenges to the industry and has great practical significance.Taking Lanzhou Metro Line 1 subway tunnel as the research object,the ANSYS finite element analysis software is used to establish the tunnel model crossing the active fault fracture zone,and the seismic and shock absorption analysis of Metro Line 1 is carried out.First an overview of the current development situation of crossing fault fracture zone tunnel seismic research,summarizes the domestic and foreign related seismic underground tunnel and anti fault research methods and theoretical calculation,the calculation theory and method and reasonable choice,combined with the actual working conditions,the activities of faults in different fault width,different fault dip and different earthquake waves.Lining displacement,stress characteristics and rules,put forward a reasonable range of fault protection.Secondly,the comparison and analysis of different thickness of the damping layer and different length of tunnel segment are carried out,and the reasonable seismic design measures are put forward.Finally,the overall stability and safety of the tunnel under the conditions of setting aseismic measures are analyzed.The research results provide reference for the seismic design and similar project construction of Lanzhou Metro crossing active fault.