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| Analysis of the Construction Deformation of the Foundation Pit Excavated for Metro Station Built in Soft Site |
| ZHUANG Hai － yang1，WU Xiang － zu2，QU Ying － jun3 |
| 1． Nanjing University of Technology，Nanjing，Jiangsu 210009，China; 2． Zhejiang Provincial Institute of Communications Planning，Design ＆ Research，Hangzhou，Zhejiang 310006，China; 3． Shanghai No． 1 Construction Co． Ltd，Shanghai 200120，China |
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Abstract Research purposes: In this paper，the construction deformations of the foundation pit excavated for metro station built in soft site are counted in system． The settlement of the ground surface，the horizontal deformation of wall and the settlement of the upright column are analyzed based on the monitoring results． The conclusions and suggestions given in this paper can be referenced in design and construction of the similar foundation pit．
Research conclusions: ( 1) The ground surface settlement during the underground structure being constructed may be larger greatly than that during the foundation pit being excavated when the underground structure is built in the soft site． Accordingly，the deformation of the foundation pit during the underground structure being constructed must be intensified． ( 2) The horizontal deformation of the support wall is very sensitive to the excavation thickness and the properties of soil layers every time． It is obviously that the cumulate horizontal displacement of the support wall becomes increasing faster with the excavated depth of foundation pit increasing． ( 3) When the excavated depth of foundation pit and the thickness of soil layers laying under the bottom of foundation pit change obviously，the differential settlement of upright column must be considered carefully． ( 4) The space － time variation of the foundation deformation is obviously when the soft soil layers existing around the foundation pit． The excavation size of soils must be designed carefully．
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Received: 07 January 2011
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2011, Vol. 28 
