In view of the unclear mechanical mechanism of semicircular curved tunnel under the action of fault dislocation,taking the Paomashan No.2 Tunnel as the background,the numerical model of semicircular curved tunnel passing through normal fault,reverse fault and strike-slip fault is established by ABAQUS software,and the tunnel OLDT damage grade is introduced to study the mechanical behavior of semicircular curved tunnel under the action of different faults.The results show that because the dislocation direction of the strike-slip fault is located in the plane of the tunnel,the relative deformation,axial force,shear force and damage degree of the strike-slip fault are greater than that of the normal and reverse fault,and the tensile damage is especially severe at the entrance and exit of the tunnel.At the same time,under the action of the strike-slip fault,the semicircular curved tunnel will have a certain torsion near the fault.Under the action of positive and reverse faults,the relative deformation,internal force and damage degree of semicircular curved tunnel are mainly concentrated near the fault,which is similar to that of linear tunnel.Therefore,in the follow-up similar engineering design,appropriate measures need to be taken for the above positions.
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