Abstract: The antifault effect of different measures is discussed and the key control indicators such as tunnel structural deformation, joint opening, dislocation form, steel bar stress, and bolt axial force under three various antifracture schemes are analyzed by taking the 2nd submarine tunnel of Jiaozhou bay as an example using case investigation and numerical simulation methods, so as to investigate the reasonable antifault design measures for the tunnel crossing the active fracture zone. The research results show the following: (1) Under fault action, the force and deformation laws of segment structures using three various antifault measures are basically the. The influence of fault action on the tunnel structure is mainly concentrated in the range from 30 m outside the upper wall boundary of the broken zone to 30 m outside the bottom wall boundary. (2) The overall force of the steel bars under the fault action shows a state of compressed top and bottom steel bars and tensioned two waist bars. The maximum tensile stress of the steel bar with a ring width of 1.5 m is 436 MPa, and the steel bar does not yield under the three working conditions. (3) The circumferential joint opening of the segment with a ring width of 1.5 m is 3.8 cm, which is 60%~70% less than the other two working conditions. (4) The antidislocation design plan is proposed with the segment ring width of 1.5 m and the seismic fortification area ranging from the left boundary of the hanging wall 2〖WT５《TNR#I》〗D〖WT５《TNR》〗 to the right boundary of the bottom wall 2〖WT５《TNR#I》〗D〖WT５《TNR》〗 (〖WT５《TNR#I》〗D〖WT５《TNR》〗 is 15.0 m). The research results have a certain reference effect on the research of anti dislocation schemes for shield tunneling through the fault zone with large dislocation momentum.

Key words: shield tunnel, large dislocation fault, deformation characteristics, anti dislocation measures, joint opening