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| Analysis of the Surface Subsidence during the Excavating of Large-span Subway Station under Shallow Cover |
| YANG Hui-jun1, KONG Heng2 |
| 1. China Railway Sixth Group Co. Ltd, Beijing 100036, China; 2. Beijing Municipal Construction Co. Ltd, Beijing 100045, China |
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Abstract Abstract：Research purposes： During the excavating of large-span subway station with shallow cover, the phenomenons such as repeated disturbance, complex mechanical conversion easily occur, which bring excessive surface subsidence. In the paper, the construction of tunnel arch excavation and support with shallow cover is introduced mainly, the analysis of deformation law, and influences of construction sequence are made on basis of monitoring and measurement for the surface subsidence.
Research conclusions：The research conclusions show: (1) The average value of surface subsidence is up to -36.31 mm, the limit of the surface settlement should be modified in order to decrease both negative effect on the surrounding environment and construction cost. (2) The ground surface settlement trough due to the construction is at the center of subway station, the distance between flex point and the center of subway station is about 18 m, meanwhile, the surface subsidence over 20 m from the center of subway station decreases rapidly, the distribution of the surface subsidence is 25~30 m from both sides of the subway station. (3) The surface subsidence due to construction of the subway station mainly occurs in a small pilot tunnel excavation supporting and buckle arch construction stage, 48.47% and 93.03% of the total settlement, especially during the course of a small pilot tunnel excavation supporting, which is close to half of the total settlement. (4)The result can provide the reference for design and construction of the similar engineering.
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