The seismic mechanical behavior of lining structure of deep-embedded cylindrical surge-shaft with multifork tunnel is analyzed by using 3D nonlinear FEM. Combined with the elastoplastic constitutive relations of rock mass

the implicit bolt element and anchorage cable element

a calculation method of excavations

supports and lining cracks of complex surge-shaft structure is presented. The stress and distortion characteristics of lining under seismic wave is calculated by using wave field pseudo-static method

also the calculation formula for the lining crack width and structural reinforcement is provided. By an actual engineering computation

the distortion characteristics and stress distribution rules of the dimensional multifork surge-shaft lining structure under seismic action are revealed

which verifies the rationality and feasibility of this method; and that provides a new idea and reference for the complex surge-shaft design and construction in meizoseismal area.