Study on Response Characteristics of the Tunnel Structure under Dislocation of Strike-slip Faults with Multiple Fracture Surfaces
The rock mass dislocation in the large active strike-slip fault fracture zone exhibits significant nonlinear characteristics,resulting in varying failure features of rock and soil masses in different areas of the fault zone.This makes the deformation and stress of tunnel structure crossing fault zones increasingly complex.This paper,based on a tunnel project crossing a large strike-slip fault,uses model tests and numerical simulations to obtain the longitudi-nal distribution patterns of tunnel structure responses when crossing faults with multiple fracture surfaces.The re-sults show that with the increase in fault dislocation,the horizontal displacement of the tunnel continuously increases,showing an S-shaped deformation pattern,with dislocation-induced deformation mainly occurring in the fault zone.Under strike-slip fault dislocation,the compression is more pronounced between the reverse bending concave sec-tion of longitudinal deformation curve of the tunnel arch waist and the surrounding rock,while the convex section has a tendency to detach from the surrounding rock.The stress-induced failure of the tunnel structure is mainly con-centrated near the two fault dislocation surfaces,with the tunnel structure in the upper wall being more prone to failure compared to the lower wall.
Tunnel engineeringStructural dynamic responseMultiple fracture surfacesStrike-slip faultModel test
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