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| Spatial Evolutional Mechanism of Diaphragm Wall Lateral Deformation in Metro Station Construction |
| LI Wei-ming1, YAO Cheng-yi1, SHI Xu-dong2, WU Zheng2, DING Jing-wen2 , JIANG Yi 3 |
| (1.School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, Hubei 430023, China；2. China Railway 19th Bureau Group Co. Ltd, Beijing 100176, China； 3. Purdue University, West Lafayette, Indiana 47906, U.S.A.) |
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Abstract Abstract：Research purposes： The Metro station is always in the city downtown, and lots of factors should be considered carefully. One of the factors is the lateral deformation of the diaphragm wall. The deformation is difficult to investigate by analytic solutions, and the numerical simulation is hard to demonstrate all the mechanisms. Therefore, the spatial evolutional mechanism and the statistical characteristics need to be explored based on the long-time monitoring data. Research conclusions： (1) The lateral deformation of the diaphragm wall is affected significantly by the time effect. The construction process should be optimized, and the brace should be added after the excavating. (2) The deformation increases deeply in the foundation pit excavation, and increases insignificantly while the station is in construction. The maximum velocity of the deformation occurs while the fifth layer excavates. (3) The period between the foundation bottom excavating and the bottom floor concreting is one of the main period for the deformation growth, in which period the performance increase much. The lateral deformation increments slow down and shape becomes to be stable after the bottom floor concreting. (4) The results are helpful for the design and construction of similar metro station engineerings.
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Received: 17 April 2017
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2017, Vol. 34 
