Abstract Seismic response analysis on super large-diameter undersea shied tunnel under high seismic intensity was carried out using the software FLAC3D by dynamic finite element method. Results indicated that: 1, Compared with the action of gravitational stress field, the structural internal forces will be increased by seismic action, with the crown and spandrel as the weak places; 2, Under the combined action of gravity and earthquake, tensile stresses of lining mainly occured near the crown, with the max. tensile stress exceeding the designed tensile strength of C60 concrete, possibly resulting in local dropping of lining segment at crown; 3, The maximum stresses and displacements of lining usually occured within 2~6 seconds after earthquake; 4, Variation regulation of time-history curves of displacements, bending moments, shear forces and axial forces was similar; 5, The maximum horizontal displacement and vertical displacement of tunnel lining were 3.6 cm and 3.7 cm respectively.
Abstract：
Seismic response analysis on super large-diameter undersea shied tunnel under high seismic intensity was carried out using the software FLAC3D by dynamic finite element method. Results indicated that: 1, Compared with the action of gravitational stress field, the structural internal forces will be increased by seismic action, with the crown and spandrel as the weak places; 2, Under the combined action of gravity and earthquake, tensile stresses of lining mainly occured near the crown, with the max. tensile stress exceeding the designed tensile strength of C60 concrete, possibly resulting in local dropping of lining segment at crown; 3, The maximum stresses and displacements of lining usually occured within 2~6 seconds after earthquake; 4, Variation regulation of time-history curves of displacements, bending moments, shear forces and axial forces was similar; 5, The maximum horizontal displacement and vertical displacement of tunnel lining were 3.6 cm and 3.7 cm respectively.
LIU Ji-Guo,
Guo-Xiao-Hong,
Cheng-Yong
.Seismic Response Analysis on Super Large-diameter Undersea Shied Tunnel under High Seismic Intensity[J] MODERN TUNNELLING TECHNOLOGY, 2011,V48(3): 53-58
2011, Vol. 48 