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| Influence of Earth Pressure Load on Lining Structure of Soil Tunnel |
| GAO Xuantao |
| China Railway First Survey and Design Institute Group Co.Ltd, Xi′an, Shaanxi 710043,China |
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Abstract Research purposes： At present, the vertical earth pressure at the top of the lining structure is usually considered as the uniform load, but the influence of the earth pressure load at the corner between the arch and the waist of the tunnel on the lining structure is rarely studied. In order to study the influence of earth pressure load at corner between arch and arch waist on the stress of lining structure, this paper uses the load-structure method to analyze and demonstrate the influence of earth pressure load at corner on the stress of lining structure based on the tunneled section from Sichuan Shida Station to Jiaozi Interchange station of Chengdu Metro Line 13, in order to provide useful help for the subsequent design of soil tunnel lining structure.Research conclusions： (1) Considering the earth pressure load between the tunnel arch and the arch waist, the extreme internal force and reinforcement of the lining structure increase compared with the vertical earth pressure uniform load mode, and the axial force increases more than the bending moment. (2) With the improvement of surrounding rock conditions and the increase of tunnel burial depth, the extreme value of internal force of tunnel lining structure and the increase of reinforcement amount under the action of corner earth pressure load gradually decrease. Therefore, when the surrounding rock conditions of tunnel are poor or the tunnel is (over) shallow buried, the lining structure design should reasonably consider the influence of corner earth pressure load to ensure the long-term safety of tunnel. (3) The research results can provide useful reference for the subsequent design of soil tunnel lining structure.
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