富水砂卵石地层地铁车站PBA暗挖施工技术

Construction technology of PBA undercover excavation for subway stations in rich water sand and gravel strata

文章介绍了成都地铁13号线光华村站下穿既有二环市政隧道及高架桥PBA暗挖的施工技术。重点介绍了砂卵石地层PBA四导洞暗挖施工步序,分析总结了PBA法的关键技术,为类似城市地铁富水砂卵石地层下穿市政隧道、高架桥项目施工提供参考。

This article introduces the construction technology of PBA undercover excavation under the existing second ring municipal tunnel and elevated bridge at Guanghuacun station of Chengdu metro line 13.The key techniques of PBA method are analyzed and summarized,with a focus on the construction steps of PBA four guide tunnel undercover excavation in sand and gravel formations,and provides reference for the construction of municipal tunnels and elevated bridges under the rich water sand and gravel strata of similar urban subways.