Abstract：Abstract：Research purposes：Excavation, segment and second line set of soil in subway shield construction can lead to the surface deformation of the retaining wall, retaining wall subsidence and incline, especially for the operation of upper highway. Midas/GTS is used to simulate Beijing metro line 6 through Beihuangmuchang Qiao section of Tong Yan highway, the deformation characteristics of subgrade buttressed retaining wall between bridge and subgrade is analyzed by the tunnel shield construction around line.
Research conclusions：(1)The vertical displacement deformation of the retaining wall and the distance between retaining wall and the abutment present the parabolic trend of "big in the middle and small in the edge". (2)The settlement of retaining wall is produced most in the left line of earlier process of the construction, the later construction in the right line is small, it seems that the settlement of retaining wall is mainly produced in the first shield construction. Therefore, we should reduce the advance appropriate length in the process of construction for the first time. (3)The deformation of the retaining wall and the location distance of the shield tunnel presented negative correlation, the slope of retaining wall is found that above the shield construction it turns out gradient extremum, in the both sides of extreme value point it decrease gradually. (4)The results of the paper can be used to provide guidance for safety assessment work when subway shield tunnel cross the upper retaining wall structure.
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