Simulation of anti-seismic support measures and analysis of anti-seismic support effect for surrounding rock of underground tunnel
Bolt and lining are two important support measures to ensure the stability of tunnel surrounding rock under seismic action.The fully grouted rock bolt was treated in sections,and a composite anchored rock mass element model was established.The support effect of bolt on surrounding rock was studied from two aspects:physical parameter reinforcement and support reaction constraint,and then an anti-seismic support simulation method for bolt was proposed.The dynamic contact process between lining and surrounding rock was simulated by the dynamic contact force algorithm,and an anti-seismic support simulation method for lining was formed.Then,taking a diversion tunnel project as an example,the influences of support parameters of bolt and lining on the anti-seismic effect of surrounding rock were studied.The results show that bolt and lining both have good support effect under seismic action.But on the whole,bolt support effect is better than that of lining,and there are optimal support parameters for bolt and lining.The calculation results can provide a scientific basis for the optimal design of anti-seismic support of underground tunnel.
underground tunnelbolt supportlining supportanti-seismic support effectseismic response
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