Research on Influence of Deep Foundation Pit Engineering on Deformation of Existing Bridge Pile Foundations
The construction conditions of urban transportation infrastructure have been becoming increasingly complicated.Due to the rapid transformation of roads,when new open cut tunnels pass through existing bridge pile foundations around,the excavation of the tunnel foundation pit maybe cause horizontal displacement of the bridge pile foundation,which will affect the safety of the bridge structure.Being based on the calculation and analysis on the displacement of bridge pile foundation caused by the excavation of tunnel foundation pit under the typical deep soft foundation geological conditions in Southern China,the influence of the excavation of foundation pit on the displacement of bridge pile foundation under different conditions has been studied.It has been found that the rigidity of different foundation pit retaining structure has obvious influence on the displacement of pile foundation.When the retaining structure adopts ϕ0.8m,ϕ1.0m,ϕ1.2m bored cast-in-place piles,the horizontal displacement of bridge pile foundation is 9.4mm,6.3mm and 4.5mm respectively.The foundation treatment at the bottom of the foundation pit is important for the displacement of the pile foundation and the overall safety of the foundation pit and bridge.Based on the monitoring results,the horizontal displacement control effect of the foundation pit and bridge pile foundation will be better when the ϕ1.2m diameter bored pile enclosure structure and the 80%replacement rate high-pressure rotary jet grouting pile foundation treatment plan are used for the foundation pit.
NETL
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万方数据
