About the author:

China Railway South Investment Group Co., Ltd., Shenzhen, Guangdong 518000, China

Abstract:

Combined with the section project of Dinggong Road North Station to People’s Park Station ofNanchang Metro Line 4, this paper introduces the construction method of removing the obstacles underthe existing station through underground excavation in advance, and constructing the channel before theshield advancing when the shield underpasses through the Dinggong Road North Station of NanchangMetro Line 1 in a complex stratum environment. The key technology of “ horizontal +verticalcombination, synchronous freezing of double⁃hole super⁃large cross⁃section ”was adopted in theconstruction of the underground excavation channel,which effectively controls the settlement, floating,freezing and frost heaving, and thaw settlement risks of the track bed slab （ above the channel） in theStation. Engineering practice shows that this technology can reduce the impact on the operation of railtransit and the ground environment of Line 1, ensure the overall stability of the construction process ofobstacle clearing and underground excavation, and avoid the occurrence of safety accidents.