Abstract
Convergence confinement method is an important guidance method for tunnel construction and support design. Numerical simulation method was used to comparatively analyze the ground reaction curve and the plastic zone under different rock grade and roadway tunnel size. The results show that the change of tunnel size has different effects on the maximum deformation of the tunnel arch crown, the ground reaction curve and the plastic zone range. Finally, some suggestions were put forward for the construction and optimization of the large span arch tunnel support structure. The research results may provide some guidance for related engineering
Highlights
IntroductionThere are various deficiencies in the analytical solutions in actual highway tunnel engineering, according to the monitoring data, the mechanical properties of the surrounding rock of the tunnel are obtained by inversion[1]~[3], apply numerical simulation analysis method, based on the design needs of the secondary lining support of the tunnel, consider two different tunnel sizes (different lanes), study its different surrounding rock characteristic curves[4]~[5] and surrounding rock plastic zone morphology respectively, and conduct comparative analysis
In this paper, there are various deficiencies in the analytical solutions in actual highway tunnel engineering, according to the monitoring data, the mechanical properties of the surrounding rock of the tunnel are obtained by inversion[1]~[3], apply numerical simulation analysis method, based on the design needs of the secondary lining support of the tunnel, consider two different tunnel sizes, study its different surrounding rock characteristic curves[4]~[5] and surrounding rock plastic zone morphology respectively, and conduct comparative analysis.A highway tunnel entrance pile number K7 + 595, the exit pile number is K8+970, the length of the tunnel is 1375m
In the case of two lanes, the area of the surrounding rock plastic zone is about 10% smaller than that of a three-lane tunnel
Summary
There are various deficiencies in the analytical solutions in actual highway tunnel engineering, according to the monitoring data, the mechanical properties of the surrounding rock of the tunnel are obtained by inversion[1]~[3], apply numerical simulation analysis method, based on the design needs of the secondary lining support of the tunnel, consider two different tunnel sizes (different lanes), study its different surrounding rock characteristic curves[4]~[5] and surrounding rock plastic zone morphology respectively, and conduct comparative analysis
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