科研之友
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摘要
In order to study damage mechanism and shock absorption joint damping technology of tunel passing through an interface of soft and hard rock in highly seismic area, the strong earthquake vibration dynamic test was carried out based on a tunnel. By analyzing formation inertia force, differential displacement, principal tensile stress, internal force and safety factor, five kinds of working conditions were comparative studied, mainly including condition A(no damping measures in hard rock), B(no damping measures in soft rock), C(no damping measures in junction of soft and hard rock), D(absorbing joint only secondary lining in junction of soft and hard rock), E(combination shock absorption measures in junction of soft and hard rock). The result show that displacement difference is significant under strong earthquake crossing interface of soft and hard rock, and the formation inertia force of soft rock is stronger than that of hard rock. The damping rate of principal stress or internal force is beyond 47% and 40% by setting shock absorbing joint only secondary lining. And the rate of maximum damping with staggered joint is increased by about 20% comparing with absorbing joint only secondary lining. The shock absorption structure of staggered joint is recommended to be used in the tunnel crossing interface of soft and hard rock in high intensity zone, namely absorbing joint in secondary lining is combined with the length of lining trolley and the shock absorption gap of initial support is set by 3 m interval. The research results have important significance to anti shock technology for traffic lifeline crossing interface of soft and hard rock in highly seismic area.
