Abstract
This paper is based on the Shanchongqing Tunnel of Yishi Expressway in Yunnan Province and takes numerical simulation to analyze the feasibility of using the three-step method to construct a three-lane large section tunnel in red beds. Through the research, it is found that the maximum displacement and settlement of the vault is -10.72mm, and the uplift value of the tunnel invert is 9.49mm; the maximum horizontal displacement of the arch waist on the left is 11.03mm, and the minimum horizontal displacement of the arch on the right is -12.52mm; the top displacement settlement extreme value is -10.72mm, the uplift value of the tunnel invert is 9.49mm, the maximum horizontal displacement value of the left arch waist is 11.03mm, and the minimum horizontal displacement value of the right arch waist is -12.52mm; the maximum axis of the left tunnel anchor rod The force is 41.82Mpa, and the maximum axial force of the bolt support structure of the right hole is 43.72Mpa. Therefore, through empirical comparison, these values meet the stability requirements of the tunnel. Comprehensively, the three-step method is feasible in the excavation of large-section V-level surrounding rock in red geology.
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