Abstract The construction of the Daguanying subway station on Beijing Metro Line 7—beneath heavy traffic on Guangan Avenue and adjacent to a pedestrian overpass—features a large excavation cross section, complex soil conditions and numerous underground utilities. In order to guarantee safe construction and normal operation of municipal infrastructure, FLAD3D software was used to establish a model for the pilot tunnels and a comparison study of the excavation schemes for the pilot tunnels was carried out. The results indicate that the settlements at the crown, utilities and ground induced by excavation of the upper pilot tunnel first were less than those induced when excavation of the lower pilot tunnel occurred first; the stress distribution on the lining was also more reasonable for the former, so the scheme of excavating the upper pilot tunnel first was selected. Dynamic monitoring of the settlements at the crown, utilities and ground was carried out during excavation of the pilot tunnels and the real-time monitoring results are nearly consistent with those of numerical simulation, which indicates the rationality and feasibility of this numerical analysis.
Abstract：
The construction of the Daguanying subway station on Beijing Metro Line 7—beneath heavy traffic on Guangan Avenue and adjacent to a pedestrian overpass—features a large excavation cross section, complex soil conditions and numerous underground utilities. In order to guarantee safe construction and normal operation of municipal infrastructure, FLAD3D software was used to establish a model for the pilot tunnels and a comparison study of the excavation schemes for the pilot tunnels was carried out. The results indicate that the settlements at the crown, utilities and ground induced by excavation of the upper pilot tunnel first were less than those induced when excavation of the lower pilot tunnel occurred first; the stress distribution on the lining was also more reasonable for the former, so the scheme of excavating the upper pilot tunnel first was selected. Dynamic monitoring of the settlements at the crown, utilities and ground was carried out during excavation of the pilot tunnels and the real-time monitoring results are nearly consistent with those of numerical simulation, which indicates the rationality and feasibility of this numerical analysis.
TAN Wen-Hui,
SUN Hong-Bao,
XU Lu-Hang
.Excavation Schemes for Eight Pilot Tunnels in the Daguanying Subway Station on Beijing Metro Line 7[J] MODERN TUNNELLING TECHNOLOGY, 2015,V52(3): 168-
2015, Vol. 52 