Research on inner force and deformation characteristics of shield tunnel under different geological conditions
Li Jie1 Zhang Qi2,3 Zhang Wenjun2,3,4
1. Tianjin Binhai New Area Railway Transportation Investment Development Co., Ltd., Tianjin 300450, China;
2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Tianjin 300354, China;
3. School of Civil Engineering, Tianjin University, Tianjin 300354, China;
4. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China
Abstract：In order to study the lining structure of shield tunnel in Binhai district of Tianjin city, a three-dimensional strata structure model was established by the finite element software ABAQUS. Considering the nonlinear characteristics of tunnel segments material, using the plastic-damage constitutive model of concrete material, the Internal force distribution and deformation properties of tunnel segment structure after the interaction of stratum and tunnel structure, as well as the tension and compression damage of tunnel segments were studied. Finally, the influence of different geological conditions on the structure of tunnel segments was studied. The results of numerical analysis show that: The deformation of the cross section of the tunnel segment is characterized by horizontal outward expansion and vertical compression, showing the shape of “horizontal duck egg”. The axis force of the tunnel vault is the smallest and the arch waist axis force is the largest. When the outside of segment is pulled, the maximum bending moment is located in the arch waist. When the inner side of segment is pulled, the maximum bending moment is located in the vault. The distribution of tension and compression damage is concentrated in the arch bottom, and the area of the compression damage area of the segment is larger than that of the tensile damage area. The better the geological conditions, the more uniform the deformation is with the axis direction, the smaller the axial force and bending moment, the vertical displacement of the tunnel structure, the deformation of the cross section, and the damage area and damage degree of segment ring are. The research results provide reference for further discussion on deformation performance and damage distribution of tunnel lining structure.
李 婕 张 琪 张稳军. 不同地质条件下盾构隧道受力变形特性研究[J]. 土木工程学报, 2019, 52(S1): 69-77.
Li Jie Zhang Qi Zhang Wenjun. Research on inner force and deformation characteristics of shield tunnel under different geological conditions. 土木工程学报, 2019, 52(S1): 69-77.
