Abstract: Considering the subway tunnel of Urumqi Metro Line 1 crossing a fault in Jiujiawan, a largescale shear dislocation model test was designed for crossing a normal fault with 60 degree in the segmental lining structure of subway tunnel. Through monitoring and analyzing the key mechanical characteristics of tunnel structure deformation, strain distribution, surrounding rock stress and cracking in the process of fault dislocation simulation, the response law of normal fault with stick-slip dislocation on the tunnel structure was obtained. The results show: 1) Under the influence of normal fault with stick-slip dislocation, the arch springing in the fault is in compression and shear state , while hanging wall arch and footwall vault near the fault are in tensile state of the longitudinal section, and the inner side of the arch and the outside of the wall on both sides of the fault are in the large eccentricity stress state in the cross section. 2) The failure modes of tunnel include oblique crack, longitudinal crack and circumferential crack after the fault dislocation. 3) After stick-slip dislocation reaches 7.0 cm in the normal fault (equivalent to the actual dislocation 1.75 m), the damage zone of the hanging wall tunnel structure is 4.2D (D is the tunnel span), the damage zone of the footwall is 2.4D, and the damage zone of the hanging wall is obviously larger than the footwall.

Key words: normal fault, stick-slip movement, subway tunnel, model test, failure zone