Study on Optimization of Initial Support for a Tunnel in the Fracture Zone Based on the Strength Reduction Method

In this paper, the fracture zone of Chunxuan Road Tunnel in Jinan, Shandong Province, China was selected for engineering background. With reference to field monitoring data, a finite element model established based on strength reduction method. aid model, influences different initial support parameters (including lining, bolt and steel arch) tunnel deformation were analyzed obtain reasonable parameters. The results show that under original is severe. Among methods, such as bolt, arch, lining arch significantly influence zone. Therefore, selecting appropriate can effectively control After optimized scheme adopted, failure instability no longer occurs also controlled. research findings provide clear optimization similar projects.