Research and practice of monitoring indices for deep excavations of metro

Because of the high requirements for protecting the surroundings around deep excavations of metro (DEM), it is important to study and establish the monitoring index system for DEM. Moreover, as a result of hydrologic and geologic conditions varying from one territory to another, it is necessary to establish the monitoring index system which is suitable for local situation. Based on discussing the connotation of the monitoring index system for DEM, the ideas for the monitoring index system for DEM are described. Monitoring data of 140 inclinometer holes in 12 excavations of Ningbo Metro Line One are integrated to study the hierarchical control indices of DEM. And a relevant control index system, which is valuable for reference, is obtained.