Research on Interaction Mechanism between Segmented Lining Structure and Surrounding Loess under Activing Ground Fractures
In ground fracture region, Xi’an subway adopted segmented lining to adjust for the differential settlement. We applied three-dimensional finite difference method to simulate “plateau type” ground fractures. The conclusion is that segmented lining structure can restrain tunnel surrounding soil deformation near ground fractures effectively. Far away from the tunnel longitudinal axis, the surface settlement is consistent with free field. The change region of the soil pressure mainly distributes in 30m of ground fractures upward and 20m of ground fractures downward. The axial stress, major principal stress and minor principal stress on the inner side of lining with tunnel axis is more tensile than the outside one, and their tensile region are concentrating in the waist lining structure, their compression region are mainly distributing in vault and arch bottom. Based on the results, we suggest that the pulling reinforcing steel should be used in the waist lining structure.
Qing Yang, Li Hua Zhu, Jing Jing He, Zeng Feng Yan and Rui Ren
F. T. She et al., "Research on Interaction Mechanism between Segmented Lining Structure and Surrounding Loess under Activing Ground Fractures", Advanced Materials Research, Vols. 368-373, pp. 720-724, 2012