Construction Method of Deep Excavation Closely Surrounding Existing Subway Bridge Piles
This paper presents a case history of the impact of the closely deep excavation on the surrounding the existing sub-way viaduct piles.In the underground transfer center project at the proposed Suzhou Metro Line No.8 and the existing Line No.2,a three-dimensional finite element simulation numerical model was used to study the impact of different excavation se-quences and soil reinforcement lengths on the safety of the existing bridge piles of the surrounding deep excavations.The nu-merical results are compared with the field monitoring data.The evaluation results show that the symmetrical synchronous ex-cavation of the proposed foundations on both sides of bridge piles has less surrounding surface settlement,the less deformation of the retaining structure and the less deformation of viaduct piles than that of the sequential excavation.The ability of the soil surrounding the pile to resist deformation increases with the increase of the reinforcement length of the protective casing.When the re-inforcement length exceeds the excavation depth,the improvement effect of the ability of the soil around the pile to resist deformation is no longer obvious,and the optimal reinforcement length of the bridge pile is basically the same as the excavation depth.
Deep ExcavationSubwayBridge PilesNumerical SimulationField Tests
万方数据
维普
