| Citation: |
YU Haitao, LI Tingting, YAN Xiao. Multi-scale response characteristics of overlying soil-tunnel system under reverse fault dislocation[J]. Hydrogeology & Engineering Geology, 2025, 52(4): 202-213. doi: 10.16030/j.cnki.issn.1000-3665.202502016
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Multi-scale response characteristics of overlying soil-tunnel system under reverse fault dislocation
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Abstract
The propagation and rupture process of bedrock fault dislocation in the overlying soil layer is controlled by many factors, which makes the response mechanism of the tunnel structure crossing the overlying soil under fault dislocation unclear. To solve this problem, a three-dimensional discrete-continuous coupling model is established, in which the discrete element is used to simulate the microscopic characteristics of the soil particles and deformation mode of the overburden layer, the finite difference method is used to calculate the macroscopic mechanical response of the tunnel structure, and the interface coupling is used to realize the interactive transfer between the above two methods. Based on the multi-scale model, the rupture propagation process of bedrock fault dislocation in the overlying soil layer, as well as the deformation response of the tunnel structure in the overlying soil are investigated. The effects of the fault dip and the depth of tunnel on the tunnel failure mode are also investigated. Results show that the bedrock fault dislocation propagates in the form of shear zone in the overburden, and the existence of tunnel structure will increase the deformation area of the soil. The deformation mode is the anti-symmetric distribution of lining stress in the upper and lower disks of the bending area caused by longitudinal bending of the tunnel, and the structural failure of the tunnel structure occurs firstly in the upper disk section, which shows the significant effect of the upper disk. Suffering the same bedrock dislocation, the tunnel structural is more likely to be damaged with a smaller fault dip. In addition, under a higher depth of tunnel, the deformation zone of the surrounding soil will be concentrated, resulting in the instability of the tunnel. The study can provide a scientific basis for the seismic design of tunnel structures in the overlying soil under the action of bedrock fault dislocation.
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References
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YU Haitao, LI Tingting, YAN Xiao. Multi-scale response characteristics of overlying soil-tunnel system under reverse fault dislocation[J]. Hydrogeology & Engineering Geology, 2025, 52(4): 202-213. doi: 10.16030/j.cnki.issn.1000-3665.202502016
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Figure 1.
Diagram of cross-fault tunnel in overlying
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Figure 2.
Principle of PFC-FLAC3D interface coupling
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Figure 3.
Rolling resistance linear model (reploted from Ref. [11])
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Figure 4.
Simulation results of 3D direct shear test
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Figure 5.
Localized small particle cryptographic authentication
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Figure 6.
Cloud image of particle displacement and rotation when normalized bedrock dislocation h/H=10%
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Figure 7.
Displacement curve of tunnel arch
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Figure 8.
Curve of the change rate of the diameter of the tunnel along the longitudinal section
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Figure 9.
Soil deformation diagram and force chain diagram of −50 section (upper wall) when h/H=10%
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Figure 10.
Principal stress cloud diagram of the tunnel
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Figure 11.
Tunnel principal stress analysis
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Figure 12.
Tunnel failure evolutionary process
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Figure 13.
Tunnel vault displacement under different fault dip
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Figure 14.
Principal stress curve of the tunnel along the longitudinal section when h/H=6%
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Figure 15.
Evolution of tunnel failure volume under different inclination angles
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Figure 16.
Displacement curve of tunnel vault with different buried depths
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Figure 17.
Soil displacement curves at different soil depth
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Figure 18.
Principal stress curve of the tunnel along the longitudinal section at h/H=6% with different buried depths
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Figure 19.
Failure evolution diagram of tunnels with different buried depths