Combining with engineering practice in Shanghai M9,mechanical behavior of segment lining under different assembling modes is analyzed with the help of FEM.The result shows that the mechanical behavior of segment lining with different assembling modes differs in the assembled types,the analysis made of the circumferential lining and location of longitudinal joint as well as the locations of key block.The mechanical behavior and deformation of the sequenced segment lining and the staggered segment lining duri...