Construction technology of PBA undercover excavation for subway stations in rich water sand and gravel strata
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.
Chengdu metrorich water sand and gravel strataPBA undercover excavationconstruction technique