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It is very important for an engineer to understand the evolution characteristics of pressure-arch of a highway tunnel under different stress conditions. After the numerical model of the highway tunnel being built, considering the lateral pressure coefficients varied from small to large, the forming process, distributional pattern and evolution characteristics of the pressure-arch of the highway tunnel under different stress states were analyzed. The numerical simulation of the step-bystep excavation was carried out along the tunnel axis, the distribution morphology and variation characteristics of the pressure-arches located in the front of working face and roof and floor of the tunnel during excavation were revealed. The results showed that the pressure-arch shapes of the tunnel mainly varied from spire, flat, convex, to sag top with the lateral pressure coefficient from small to large. And the stability of the surrounding rock near the tunnel working face became worse and worse with the principal stress difference increasing. The results are of great significance for the construction and reinforcing design of the similar engineering practice.

Evolution Characteristics Analysis of Pressure - Arch of a Highway Tunnel under Different Stress Conditions