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| Study on Settlement Regulations of Ground Surface and Bridge Pier Induced by Metro Station Construction with PBA Method |
| REN Jian-xi, WANG Song, CHEN Jiang, SUN Jie-long, MENG Chang, ZHU Yuan-wei |
| Xi'an University of Science and Technology, Xi'an, Shanxi 710054, China |
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Abstract Research purposes: Based on an underground metro station project in Beijing with complicated conditions, the comparison of the settlement regulations of the ground surface and bridge pier obtained by conducting the FLAC simulation prediction with the actual measured data was made to know the settlement regulations of the ground surface and bridge pier induced by the metro station construction with PBA method for providing the technical support for the information construction of underground metro station.
Research conclusions: (1)The FLAC simulation showed that with the excavation of the pilot tunnel, the settlement of the ground surface gradually increased. The curve of the settlement groove gradually changed from double peaks to single peak due to the influence of the load of the upper bridge and the dead weight of the bridge on the surface soil with playing a major role in the surface settlement at the beginning of the excavation. The maximum surface settlement happened in the center position of pilot tunnel excavation. The maximum predicted value of the ground settlement was 24.75mm and the measured value was 25.51mm. The maximum predicted value of the bridge pier settlement was 5.11 mm and the measured value was 5.89mm. Both were basically the same. (2)The result showed that the PBA construction scheme for metro station and the in-site monitoring scheme were reasonable in design and the deformations of the ground surface and pier met the specification requirements. (3)This research result could provide the reference to construction and monitoring of the large-section metro station in the area with poor geological conditions.
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Received: 09 June 2013
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2013, Vol. 30 
