Through comparison of the shaking table tests between common tunnels and cross-fault tunnels, the seismic response law and failure characteristics of the cross-fault tunnels were discussed. Besides, the developing process of lining cracks, acceleration response, strain magnitude and distribution regularities of surrounding rock pressure in such tunnels were investigated. Comparative results show the following characteristics: (1)Judging from strain and damage phenomenon, the cross-sectional extent of the fault tunnel is much larger than that in the longitudinal direction.(2)When encountering strong earthquakes, large dislocation will emerge at the construction joints, joint dislocation greatly affects the security of tunnel. (3)The surrounding rock pressure of the lining is bigger at waist while smaller at the top and bottom, the acceleration response of tunnel will occur mutation near the destruction.(4)The generation position and development direction of different lining location cracks are not the same. The cracks at the top and bottom grow from the inside to the outside. However, those at the two sides grow in the opposite way. The above analytical results can provide beneficial reference to the seismic design of the cross-fault tunnels.
Key words
cross-fault tunnels /
crack /
acceleration response /
strain /
surrounding rock pressure
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