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Abstract Taking the foundation pit of Minzhi station in metro line 5 of Shenzhen city for example，the internal force and deformation characteristics of unsymmetrical-loaded foundation pit?s enclosure structure are systematically studied based on field test；and the stability of retaining structure about the horizontal displacement and internal force of diaphragm wall is evaluated reasonably. The results show that the deformation of top of the diaphragm wall inclined towards the inside of the enclosure structure with shallow excavation depth；and the displacement of the diaphragm wall near railway is larger than that of the diaphragm wall far from railway due to the load from train and unsymmetrical bed. However，the deformation of top of the diaphragm wall far from railway moves towards the outside of the enclosure structure after the excavation depth up to threshold；and the deformation increases with the increasing of excavation depth. Moreover，under the same conditions about construction procedure and excavation depth，the moment of the diaphragm wall near railway is larger than that of the diaphragm wall far from railway；also the maximum moment position of the diaphragm wall near railway is deeper than that of the diaphragm wall far from railway. According to the stress pattern and displacement of unsymmetrical loaded foundation pit，different supporting parameters on both sides of foundation pit should be considered differently. Therefore，the test conclusions can provide reference for the design and construction of foundation pit.
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Received: 18 November 2010
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2011, Vol. 30 
