Abstract Based on the Huayuanqiao station of Beijing Metro Line 6, which passes under the Huayuan bridge, an optimal scheme for the subway station, which is constructed by the Pile-Beam-Arch (PBA) method, is determined by FLAC3D numerical simulation and the analytic hierarchy process (AHP). The impact of key construction stages on the stratum and pile foundation is analyzed in conjunction with the monitoring results. The research shows that: the effects of the four-heading method on control of the pile foundation displacement at the far and near sides is better than that of the five/six-heading method under the same grouting reinforcement conditions; the effects of the appropriate grouting reinforcement on the bridge-pile area at the near side is similar to that of wide-range grouting reinforcement if the construction methods and structures of the stations are the same; after comprehensive consideration, a five-heading method with appropriate grouting reinforcement is determined to be the optimal scheme; the ratio of surface subsidence of the heading excavation, buckle arch, and other construction procedures is 0.38∶0.32∶0.30; construction of the heading and buckle arch has a large impact on pile foundation displacement at the near side; and excavation of the platform has the most serious impact on pile foundation settlement at the far side, with heading excavation and the buckle arch taking second place (the latter greatly affects horizontal displacement).
Abstract：
Based on the Huayuanqiao station of Beijing Metro Line 6, which passes under the Huayuan bridge, an optimal scheme for the subway station, which is constructed by the Pile-Beam-Arch (PBA) method, is determined by FLAC3D numerical simulation and the analytic hierarchy process (AHP). The impact of key construction stages on the stratum and pile foundation is analyzed in conjunction with the monitoring results. The research shows that: the effects of the four-heading method on control of the pile foundation displacement at the far and near sides is better than that of the five/six-heading method under the same grouting reinforcement conditions; the effects of the appropriate grouting reinforcement on the bridge-pile area at the near side is similar to that of wide-range grouting reinforcement if the construction methods and structures of the stations are the same; after comprehensive consideration, a five-heading method with appropriate grouting reinforcement is determined to be the optimal scheme; the ratio of surface subsidence of the heading excavation, buckle arch, and other construction procedures is 0.38∶0.32∶0.30; construction of the heading and buckle arch has a large impact on pile foundation displacement at the near side; and excavation of the platform has the most serious impact on pile foundation settlement at the far side, with heading excavation and the buckle arch taking second place (the latter greatly affects horizontal displacement).
WEI Jing-1,
Wang-Fang-2,
Sun-Ming-Zhi-3
.On Scheme Optimization of the PBA Subway Station Underneath a Bridge[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(6): 101-107
2014, Vol. 51 