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Relationship between the Peripheral Displacement of a Tunnel and the Displacement of the Deep Surrounding Rock
(1 Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756; 2 Department of Railway Engineering, Sichuan College of Architectural Technology, Chengdu 610399)
Abstract Based on a two-lane expressway tunnel, FLAC3D numerical analysis software is adopted to simulate dif? ferent rock deformation evolution processes under four conditions with different depths and different surrounding rock grades. Two kinds of large deformation of the surrounding rock are determined—a convergent one and a nonconvergent one. Meanwhile, data regarding the deep surrounding rock displacements at different peripheral displacements are recorded. The relationship between the peripheral displacement and the displacement of the deep surrounding rock is obtained by analyzing the curve of the surrounding rock displacements of different positions. The results show that, as for the same type of deformation, the relationship between the peripheral displacement and the displacement of the deep surrounding rock is consistent, while it is inconsistent for different types of deformation.Based on the knowledge of the deformation type determined by numerical simulation, the loose zones and plastic areas can be determined by the correlation curve of the peripheral displacement and the displacement of the deep surrounding rock. Compared with the field-measured loose zone under large deformation, the research results prove to be rational. The regression function is obtained by a multiple regression analysis to facilitate practical application.
Abstract：
Based on a two-lane expressway tunnel, FLAC3D numerical analysis software is adopted to simulate dif? ferent rock deformation evolution processes under four conditions with different depths and different surrounding rock grades. Two kinds of large deformation of the surrounding rock are determined—a convergent one and a nonconvergent one. Meanwhile, data regarding the deep surrounding rock displacements at different peripheral displacements are recorded. The relationship between the peripheral displacement and the displacement of the deep surrounding rock is obtained by analyzing the curve of the surrounding rock displacements of different positions. The results show that, as for the same type of deformation, the relationship between the peripheral displacement and the displacement of the deep surrounding rock is consistent, while it is inconsistent for different types of deformation.Based on the knowledge of the deformation type determined by numerical simulation, the loose zones and plastic areas can be determined by the correlation curve of the peripheral displacement and the displacement of the deep surrounding rock. Compared with the field-measured loose zone under large deformation, the research results prove to be rational. The regression function is obtained by a multiple regression analysis to facilitate practical application.
.Relationship between the Peripheral Displacement of a Tunnel and the Displacement of the Deep Surrounding Rock[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(6): 85-92
2017, Vol. 54 