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| Internal force analysis and construction technology of non-column structure of large-span underground excavation station |
| WANG Qinghan1, ZHANG Hengzhen1, LI Kexian2
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1. Jinan Design Institute, Railway Engineering Consulting Group Co., Ltd., Jinan 250022, Shandong, China;
2. Qingdao Metro Line 1 Co., Ltd., Qingdao 266000, Shandong, China |
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Abstract The medium plates of the large-span underground excavated column-free station had been categorized into arched support structure, plate diagonal structure and variable cross-section structure with thick plate. Three-dimensional modeling had been carried out on the medium plates of three types, using Midas GTX software. The load structure method had been used to numerically analyze the inner force of the medium plates, the mid-span deflection and the force on the side beam of hole. The calculation results showed that the internal force distribution and deformation of the arched support structure and the plate diagonal structure were basically the same and smaller than those of the variable cross-section structure with thick plate. Under the same load conditions, the internal force distribution of the arched support structure was the best; variable cross-section structure with thick plate occupied the smallest layer space of the station, but had the largest internal force and deformation, thus with high demand on construction. The plate diagonal structure was simple with reasonable internal force distribution, and was convenient for on-site construction. The arched support structure and the plate diagonal structure have been successfully applied in Qingdao Metro Line 1 and Line 6 projects, providing a useful reference for similar projects in the future.
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Published: 25 February 2021
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