Influence of System Anchoring Bolt During Construction ofLarge cross-section Tunnel

According to the characteristics of engineering geology and supporting design in weak rock tunnel is simulated, in this paper, the influence of system anchoring bolt during construction of large cross-section tunnel in weak rock by three-dimension finite element analysis. The result shows that system anchoring bolt not only reduces the internal force of primary support and secondary support, hence improves safety of the supporting structure; but also effectively restricts relaxation of surrounding rock, reinforces the surrounding rock, improves safety of the construction.