Abstract：Research purposes: Jiashan Metro Station is a underground triple—deck island—type transfer station between Line 9 and Line 12 of Shanghai metro．The shallow ground under the station is mainly composes of muddy silty clay and muddy clay．Based on the monitored data，this paper analyzes the lateral displacement characteristics of concrete diaphragm wall，the settlement characteristics of the wall top，the swell characteristics of post and the settlement characteristics of surrounding ground，discusses their development laws and compares these laws with the researched results to obtain some valuable conclusions．
Research conclusions:From the research the following settlement characteristics of the underground metro station constructed in soft soil area with top—down method are concluded：(1)The lateral displacement of the concrete diaphragm wall is big in the middle and small on the both ends．The maximum lateral displacement occurs in the area a few meters away from the excavation face．The ratio between the maximum lateral displacement of concrete diaphragm wall and excavation depth is about 0．1 8％．(2)The longitudinal displacement of the wall is mainly of settlement and the most settlements Occur before completion of excavating the second layer．After it the longitudinal displacement of the wall top is in fluctuation state．(3)The soil in the foundation pit and the pile foundation are in swen state during excavation of the foundation pit．，and the swell volume is big in the early—stage excavation．(4)The ground settlement caused by excavation of soil is about 0．13％of the excavation depth．This research achievement can provide the valuable reference to the similar works．
罗智勇. 软土地区逆作法地铁换乘车站基坑变形特性研究[J]. 铁道工程学报, 2010, 27(12): 93-99.
LUO Zhi—yong. Research on Deformation Characteristics of Foundation Pit of Metro Transfer Station Constructed in Soft Soil Area with Top—down Method. 铁道工程学报, 2010, 27(12): 93-99.
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2010, Vol. 27 
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