About the author:

China Railway 18th Bureau Group Third Engineering Co., Ltd., Zhuozhou, Hebei 072750, China

Abstract:

A construction scheme of a anti⁃seepage wall combined with an open⁃cut method is proposed,aiming at the construction demand of shallow buried subway stations. This scheme has significantadvantages in engineering scenarios with strict displacement control requirements. The JiangshuiquanRoad Station of Jinan Metro Line 4,with a net length of 248.7meters and a net width of the standardsection of 20.2meters,was taken as an example. It has typical characteristics such as shallow burial（high groundwater level）， soft soil layer, and large⁃span structure design. Aiming at the problem ofsupporting system stability and surface deformation control caused by special geological conditions, thefinite element method was adopted to simulate the whole construction process and analyze the formationresponse. Firstly, the collaborative support system of anti⁃seepage wall⁃intermediate partition wall⁃structure floor was determined by comparison of construction methods, and then the geometric parametersof each component （ embedded depth of anti⁃seepage wall,wall thickness, and plate thickness）wereoptimized. The numerical simulation results indicate that the surface settlement curve shows a typicalgroove shape during the excavation process, and the maximum settlement value of 18.2mm appears in thearea near the wall. The distribution law is consistent with the field monitoring data.