Research on Risk Control Technology for Side Wall Opening and Excavation of Subway Operating Tunnels in Loess Regions
The Xi'an Station of Xi'an Metro Line 4 is the first"tunnel before station"project in Xi'an,and it is also an extremely rare project that requires the opening and renovation of subway tunnels in operation.In order to reduce the risk of side wall opening and excavation of subway tunnels in the loess region without shutdown,and ensure the safe operation of the subway,the risk control technology for side wall excavation and branch tunnel excavation of subway operation tunnels in the loess region was studied.The results indicate that a hidden beam is reserved at the opening interface of the side wall of the operating tunnel,and the WSS full section grouting technology is used to ensure the stability of the surrounding rock during the excavation of the support tunnel.Cutting statically and piecemeally in stopping operations,and supplemented reliable measures such as isolation and protection of the operating tunnel are used for side wall opening.Based on on-site monitoring data feedback,all monitoring indicators of the subway operating tunnel have not exceeded the warning value.It indicates that the excavation and construction of side walls and branch tunnels of subway tunnels can ensure the safety of subway operations without interrupting operations.
loess regionsubway operating tunnelside wall openingexcavationrisk control
NETL
NSTL
万方数据
