Study On Dynamic Response Of Gas Shield Tunnel Under Strong Earthquake

Central Asia Gas Pipeline Line D is a key energy strategy project of China,and an important channel engineering which can guarantee natural gas transmission between China and Central Aisa.After the construction,it will be the biggest gas system project in Central Asia,promote effectively the development of economy and society of China,and benefit many countries along the line.Therefore,it is a big project which will bring mutual benefit and profound impact.Research in this paper is based on Central Asia Gas Pipeline Line D,and aseismic design of Vakhsh shield tunnel which is a difficult section for this project in Tajikistan is finished through data study and numerical simulation.The main content and results are as follow:(1)Under design earthquake and rare earthquake respectively,stratum seismic response analysis is finished for typical section to get seismic response law of stratum.(2)Under design earthquake and rare earthquake respectively,seismic response analysis of shield tunnel in transverse direction is finished by using seismic deformation method.Influence of different filler in tunnel for force and deformation of segmental lining structure is considered,and optimization scheme is adviced.Besides,influence of different overlying water pressure is considered for force and deformation of segmental lining structure.(3)Under design earthquake and rare earthquake respectively,seismic response analysis of shield tunnel in longudinal directon is finished by using dynamic time-history analysis method.Longitudinal internal force and displacement of segmental lining structure is obtained when seismic wave is excitated laterally and longitudinally respectively along the tunnel.